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Hole-Selective Contact with Molecularly Tailorable Reactivity for Passivating High-Performing Inverted Perovskite Solar Cells

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CCS Chemistry 2024年第7期6卷 1654-1661页

作者： Wenlin Jiang yingie Hu Fengzhu Li Francis R.Lin alex k-y.jen Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong China 999077 Department of Chemistry City University of Hong KongKowloonHong Kong China 999077 Hong kong Institute for Clean Energy City University of Hong KongKowloonHong Kong China 999077 State key Laboratory of Marine Pollution City University of Hong KongKowloonHong Kong China 999077

The precisely customizable attributes of self-assembled monolayers(SAMs)molecules at the atomic level hold the potential to facilitate efficient hole selection and interface passivation ***,the correlation between the exposure of passivating groups on the surface and device performance remains ***,we introduce two newly designed SAM molecules,Cbz2S and Cbz2SMe,incorporating cyclic disulfide or two flanking thiomethyls by modifying the 4,5-position of carbazole to adjust the Lewis basicity of the SAM-modified *** possessing suitable energetic alignment,Cbz2S with more-exposed sulfur atoms exhibited inferior device performance due to excessive reactivity,leading to an overpopulation of PbI2 crystallites at the buried perovskite *** contrast,the screening effect from the methyl groups of Cbz2SMe optimized SAM reactivity,exquisitely integrating buried interface passivation and hole selection ***,the champion inverted perovskite solar cell(PSC)employing Cbz2SMe achieved an impressive power conversion efficiency of 24.42%,accompanied by prolonged *** work demonstrates the feasibility of incorporating Lewis-basic passivation groups into SAM molecules and elucidates the relationship between the reactivity of SAM passivation groups and device *** findings provide valuable insights for the design of novel multifunctional SAM molecules,further advancing the performance of PSCs.

关键词： self-assembled monolayer perovskite solar cell hole-selective layer carbazole derivatives defect passivation

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Efficient and Stable Inverted Perovskite Solar Modules Enabled by Solid-Liquid Two-Step Film Formation

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Nano-Micro Letters 2024年第9期16卷 571-582页

作者： Juan Zhang Xiaofei Ji Xiaoting Wang Liujiang Zhang Leyu Bi Zhenhuang Su Xingyu Gao Wenjun Zhang Lei Shi Guoqing Guan Abuliti Abudula Xiaogang Hao Liyou yang Qiang Fu alex k.‑y.jen Linfeng Lu Graduate School of Science and Technology Hirosaki University3‑BunkyochoHirosaki 036‑8561Japan Department of Materials Science and Engineering Department of ChemistryHong Kong Institute for Clean EnergyCity University of Hong Kong KowloonHong Kong 999077People’s Republic of China The Interdisciplinary Research Center Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210People’s Republic of China Shanghai Synchrotron Radiation Facility(SSRF) Zhangjiang LabShanghai Advanced Research InstituteChinese Academy of SciencesShanghai201204People’s Republic of China JINNENG Clean Energy Technology Ltd. Jinzhong 030300ShanxiPeople’s Republic of China Hangzhou Zhongneng Photoelectricity Technology Co. Ltd.Hangzhou 310018People’s Republic of China College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China Institute of Regional Innovation Hirosaki University3‑BunkyochoHirosaki 036‑8561Japan

A considerable efficiency gap exists between large-area perovskite solar modules and small-area perovskite solar *** control of forming uniform and large-area film and perovskite crystallization is still the main obstacle restricting the efficiency of *** this work,we adopted a solid-liquid two-step film formation technique,which involved the evaporation of a lead iodide film and blade coating of an organic ammonium halide solution to prepare perovskite *** method possesses the advantages of integrating vapor deposition and solution methods,which could apply to substrates with different roughness and avoid using toxic solvents to achieve a more uniform,large-area perovskite ***,modification of the NiO_(x)/perovskite buried interface and introduction of Urea additives were utilized to reduce interface recombination and regulate perovskite *** a result,a large-area perovskite film possessing larger grains,fewer pinholes,and reduced defects could be *** inverted PSM with an active area of 61.56 cm^(2)(10×10 cm^(2)substrate)achieved a champion power conversion efficiency of 20.56%and significantly improved *** method suggests an innovative approach to resolving the uniformity issue associated with large-area film fabrication.

关键词： Inverted perovskite solar cells Perovskite solar modules Two-step film formation Crystallization Defect passivation

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A radically different path to high-performance Sn perovskite solar cells

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Science China Chemistry 2022年第5期65卷 829-830页

作者： alex k-y.jen Department of Chemistry City University of Hong KongKowloon 999077Hong KongChina Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong KongChina Hong kong Institute for Clean Energy(HkICE) City University of Hong KongKowloon 999077Hong KongChina Department of Materials Science and Engineering University of WashingtonSeattleWA 98195USA

The emerging perovskite solar cells(PVSCs)based on the earth abundant metal halide perovskites(MHPs)have achieved very high power conversion efficiencies(PCE as high as 25.5%)that can rival those of their inorganic co... 详细信息

关键词： perovskite inorganic radical

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Selenium-fused y6 derivatives and their derived polymerized small molecule acceptors for efficient organic solar cells

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Science China Chemistry 2023年第3期66卷 615-619页

作者： Qunping Fan Francis RLin Wei Ma alex k.-y.jen State key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Department of Chemistry City University of Hong KongKowloon 999077Hong KongChina Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong KongChina Hong kong Institute for Clean Energy City University of Hong KongKowloon 999077Hong KongChina Department of Materials Science and Engineering University of WashingtonSeattleWashington 98195-2120USA

Before 2015,only few organic solar cells(OSCs)obtained power conversion efficiencies(PCEs)over 10%because the commonly used fullerene derivatives as acceptors have narrow absorption,low extinction coefficient,and are difficult to adjust energy *** overcome these shortcomings,in 2015,Zhan et al.[1]developed acceptor(A)-donor(D)-A-type fused-ring small-molecule acceptors(SMAs)with good planarity and strong intramolecular charge transfer(ICT)effect to fulfill both broad absorption and high extinction coefficient,offering the revolutionary PCEs of 13%–15%.In 2019,another milestone SMA(y6)with A-DA′D-A structure was developed by Zou et al.

关键词： fused extinction absorption

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Interface Engineering in Solution-Processed Thin-Film Solar Cells

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Accounts of Materials Research 2022年第3期3卷 272-282页

作者： Fengzhu Li alex k.-y.jen Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong Kong SAR Hong kong Institute for Clean Energy City Universtiy of Hong KongKowloon Tong 999077Hong Kong SAR Department of Chemistry City University of Hong KongKowloon 999077Hong Kong SAR Department of Materials Science&Engineering University of WashingtonSeattleWashington 98195United States

CONSPECTUS:Along with the rapid industrialization of human society over the past century,incessant energy consumption and endless damage to the environment have aroused growing attention for seeking clean and renewable energy ***(PV)that can directly harvest and transform sunlight into electricity have shown great potential in achieving this *** for solution-processed thin-film solar cells,their extremely cost-effective and facile processing methods compatible with different substrates at large scales exhibit unique advantages over conventional PVs based on crystalline *** types of solutionprocessed thin-film PVs have been achieving or already exceeded 15%power conversion efficiency(PCE)through the numerous efforts of *** solar cells(OSCs)and organic−inorganic hybrid perovskite solar cells(PVSCs)are the most well-known emerging solution-processed thin-film solar cells that have attracted great interest recently(the PCE of PVSCs soared form 3.8%to over 25%in the past decade).Usually,photogenerated excitons will form as a response to illumination in the active layer,then dissociate into charge carriers,travel in between layers,and finally get collected by electrodes of the *** the broad exploration of active layer materials,suitably matched charge-transporting layers and electrodes also play a vital role in achieving high PCE and stability in PV ***,interfaces between different functional layers created during solution processing need to be carefully addressed to ensure efficient charge transport and prevent *** utilization of proper interfacial materials to modify the chemical and electrical properties at interfaces has become an effective strategy to enhance the performance of ***,it is important to develop a comprehensive understanding into the correlation between interfacial properties and charge carrier dynamics and establish molecular design principles for i

关键词： charge interfacial Solar

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Broadband photomultiplication-type polymer photodetectors and its application in light-controlled circuit

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Science China Chemistry 2022年第8期65卷 1642-1649页

作者： Ming Liu Qunping Fan kaixuan yang Zijin Zhao Xingchao Zhao Zhengji Zhou Jian Zhang Francis Lin alex k.-y.jen Fujun Zhang key Laboratory of Luminescence and Optical Information Ministry of EducationBeijing Jiaotong UniversityBeijing 100044China Department of Chemistry City University of Hong KongHong Kong 999077China State key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China key Lab for Special Functional Materials Ministry of EducationNational and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand School of MaterialsHenan UniversityKaifeng 475004China Guangxi key Laboratory of Information Materials School of Material Science and TechnologyGuilin University of Electronic TechnologyGuilin 541004China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering University of WashingtonWashington 98195-2120United States Hong kong Institute for Clean Energy City University of Hong KongHong Kong 999077China

Photomultiplication-type polymer photodetectors(PM-PPDs)were achieved with polymer P3HT as donor and Py3Se-1V as acceptor based on structure of ITO/PEDOT:PSS/active layer/*** optimal weight ratio of P3HT to Py3Se-1V is about 100:*** of isolated electron traps are formed with Py3Se-1V surrounded by P3HT due to rather less content of Py3Se-1V in active layers and about 0.94 e V energy offset between the lowest unoccupied molecular orbitals(LUMO)of P3HT and *** optimal PM-PPDs exhibit broad spectral response from 350 to 950 nm and external quantum efficiency(EQE)values of68,200%at 360 nm,26,400%at 630 nm and 19,500%at 850 nm under-15 V *** working mechanism of PM-PPDs is attributed to the interfacial trap-assisted hole tunneling injection from external *** performance of PM-PPDs can be further improved by incorporating appropriate PMBBDT with high hole mobility as the third *** EQE values of optimal ternary PM-PPDs are increased to 105,000%at 360 nm,40,000%at 630 nm and 31,800%at 850 nm under-15 V bias,benefiting from the enhanced hole transport in ternary active *** optimal ternary PM-PPDs were successfully applied in a light-controlled circuit to turn on or turn off light emitting diode(LED).

关键词： polymer photodetectors photomultiplication external quantum efficiency broadband

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16.3%Efficiency binary all-polymer solar cells enabled by a novel polymer acceptor with an asymmetrical selenophene-fused backbone

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Science China Chemistry 2022年第2期65卷 309-317页

作者： Huiting Fu Qunping Fan Wei Gao Jiyeon Oh yuxiang Li Francis Lin Feng Qi Changduk yang Tobin J.Marks alex k.-y.jen Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong KongChina Department of Chemistry City University of Hong KongKowloon 999077Hong KongChina Department of Energy Engineering School of Energy and Chemical EngineeringPerovtronics Research CenterLow Dimensional Carbon Materials CenterUlsan National Institute of Science and Technology(UNIST)50 UNIST-gilUlju-gunUlsan 44919Republic of Korea Department of Materials Science and Engineering University of WashingtonSeattleWashington 98195-2120USA Department of Chemistry and the Materials Research Center Northwestern UniversityEvanstonIL60208USA Institute for Advanced Studies City University of Hong KongKowloon 999077Hong KongChina

Despite the significant progress made recently in all-polymer solar cells(all-PSCs),it is still quite challenging to achieve high open-circuit voltage(V_(oc))and short-circuit current density(J_(sc))simultaneously in order to further improve their *** recent strategy of using selenophene to replace thiophene on the y6 based polymer acceptors has resulted in significantly improved J_(sc)s of the resulting ***,such modifications have also depressed V_(oc),which compromises the overall performance of the ***,we present the design and synthesis of a novel polymer acceptor,PyT-1S1Se,created by inserting an asymmetrical selenophene-fused framework to precisely manipulate optical absorption and electronic *** with the selenium-free analog,PyT-2S,and symmetrical selenium-fused analog,PyT-2Se,the PyT-1S1Se derived all-PSCs not only deliver optimized J_(sc)(24.1 mA cm^(−2))and V_(oc)(0.926 V)metrics,but also exhibit a relatively low energy loss of 0.502 ***,these devices obtain a record-high power conversion efficiency(PCE)of 16.3%in binary *** work demonstrates an effective molecular design strategy for balancing the trade-off between V_(oc) and J_(sc) to achieve highefficiency all-PSCs.

关键词： all-polymer solar cells polymer acceptors asymmetrical selenophene-fused backbone power conversion efficiencies stability

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Self-assembled monolayer enabling improved buried interfaces in blade-coated perovskite solar cells for high efficiency and stability

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Nano Research Energy 2022年第1期1卷 14-21页

作者： Jie Zeng Leyu Bi yuanhang Cheng Baomin Xu alex k.-y.jen Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong KongChina Department of Chemistry City University of Hong KongKowloon 999077Hong KongChina Hong kong Institute for Clean Energy City University of Hong KongKowloon 999077Hong KongChina Department of Materials Science and Engineering Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesSouthern University of Science and TechnologyShenzhen 518055China

Despite the rapidly increased power conversion efficiency(PCE)of perovskite solar cells(PVSCs),it is still quite challenging to bring such promising photovoltaic technology to *** of the challenges is the upscaling from small-sized lab devices to large-scale modules or panels for ***,most of the efficient inverted PVSCs are fabricated on top of poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine](PTAA),which is a commonly used hole-transporting material,using spin-coating method to be incompatible with large-scale film ***,it is important to develop proper coating methods such as blade-coating or slot-die coating that can be compatible for producing large-area,high-quality perovskite thin *** is found that due to the poor wettability of PTAA,the blade-coated perovskite films on PTAA surface are often inhomogeneous with large number of voids at the buried interface of the perovskite *** solve this problem,self-assembled monolayer(SAM)-based hole-extraction layer(HEL)with tunable headgroups on top of the SAM can be modified to provide better wettability and facilitate better interactions with the perovskite coated on top to passivate the interfacial *** more hydrophilic SAM surface can also facilitate the nucleation and growth of perovskite films fabricated by blade-coating methods,forming a compact and uniform buried *** addition,the SAM molecules can also be modified so their highest occupied molecular orbital(HOMO)levels can have a better energy alignment with the valence band maxima(VBM)of *** by the high-quality buried interface of perovskite on SAM-based substrate,the champion device shows a PCE of 18.47%and 14.64%for the devices with active areas of 0.105 cm^(2) and 1.008 cm^(2),*** addition,the SAM-based device exhibits decent stability,which can maintain 90%of its initial efficiency after continuous operation for over 500 h at 40℃ in inert ***

关键词： self-assembled monolayer buried interface perovskite solar cells upscaling blade-coating

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Approaching 19%efficiency and stable binary polymer solar cells enabled by a solidification strategy of solvent additive

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Science China Chemistry 2023年第5期66卷 1500-1510页

作者： Manjun Xiao Longfei Liu yongdie Meng Baobing Fan Wenyan Su Conggui Jin Luocheng Liao Fan yi Chao Xu Rui Zhang alex k.-y.jen Wei Ma Qunping Fan College of Chemistry Key Laboratory of Environment-Friendly Chemistry and Application(Ministry of Education)Xiangtan UniversityXiangtan 411105China State key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Department of Physics Chemistry and Biology(IFM)Linköping UniversityLinköping SE-58183Sweden State key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications School of Materials Science and EngineeringChangzhou UniversityChangzhou 213164China key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China School of Materials Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China Department of Chemistry Institute for Clean EnergyCity University of Hong KongHong Kong 999077China

Additives play a crucial role in enhancing the photovoltaic performance of polymer solar cells(PSCs).However,the typical additives used to optimize blend morphology of PSCs are still high boiling-point solvents,while their trace residues may reduce device ***,an effective strategy of“solidification of solvent additive(SSA)”has been developed to convert additive from liquid to solid,by introducing a covalent bond into low-cost solvent diphenyl sulfide(DPS)to synthesize solid dibenzothiophene(DBT)in one-step,which achieves optimized morphology thus promoting efficiency and device *** to the fine planarity and volatilization of DBT,the DBT-processed films achieve ordered molecular crystallinity and suitable phase separation compared to the additive-free or DPS-treated ***,the DBT-processed device also possesses improved light absorption,enhanced charge transport,and thus a champion efficiency of 17.9%is achieved in the PM6:y6-based PSCs with an excellent additive component tolerance,reproducibility,and ***,the DBT-processed PM6:L8-BO-based PSCs are further fabricated to study the universality of SSA strategy,offering an impressive efficiency approaching19%as one of the highest values in binary *** conclusion,this article developed a promising strategy named SSA to boost efficiency and improve stability of PSCs.

关键词： polymer solar cells solidification of solvent additives power conversion efficiency device stability

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A new perspective to develop regiorandom polymer acceptors with high active layer ductility,excellent device stability,and high efficiency approaching 17%

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Carbon Energy 2023年第2期5卷 216-224页

作者： Qunping Fan Ruijie Ma Wenyan Su Qinglian Zhu Zhenghui Luo kai Chen yabing Tang Francis RLin yuxiang Li He yan Chuluo yang alex k.-y.jen Wei Ma State key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'anShaanxiChina Department of Chemistry Hong Kong University of Science and TechnologyKowloonHong KongChina School of Materials Science and Engineering Xi'an University of Science and TechnologyXi'anShaanxiChina Shenzhen key Laboratory of Polymer Science and Technology Shenzhen UniversityShenzhenGuangdongChina Department of Chemistry City University of Hong KongKowloonHong KongChina

The recently reported efficient polymerized small-molecule acceptors(PSMAs)usually adopt a regioregular backbone by polymerizing small-molecule acceptors precursors with a low-reactivity 5-brominated 3-(dicyanomethylidene)indan-1-one(IC)end group or its derivatives,leading to low molecular weight,and thus reduce active layer mechanical ***,a series of newly designed chlorinated PSMAs originating from isomeric IC end groups are developed by adjusting chlorinated positions and copolymerized sites on end groups to achieve high molecular weight,favorable intermolecular interaction,and improved physicochemical *** with regioregular Py2Se-Cl-o and Py2Se-Cl-m,regiorandom Py2Se-Cl-ran has a similar absorption profile,moderate lowest unoccupied molecular orbital level,and favorable intermolecular packing and crystallization ***,the binary PM6:Py2Se-Cl-ran blend achieves better ductility with a crack-onset strain of 17.5% and improved power conversion efficiency(PCE)of 16.23% in all-polymer solar cells(all-PSCs)due to the higher molecular weight of Py2Se-Cl-ran and optimized blend morphology,while the ternary PM6:J71:Py2Se-Cl-ran blend offers an impressive PCE approaching 17% and excellent device stability,which are all crucial for potential practical applications of all-PSCs in wearable *** date,the efficiency of 16.86% is the highest value reported for the regiorandom PSMAs-based all-PSCs and is also one of the best values reported for the *** work provides a new perspective to develop efficient all-PSCs,with all high active layer ductility,impressive PCE,and excellent device stability,towards practical applications.

关键词： all-polymer solar cells chlorination ductility power conversion efficiency regiorandom polymer acceptors

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