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Journal of Energy Chemistry 2022年第10期31卷 429-435,I0011页

作者： Feihong Ye Haibing Wang Weijun Ke Chen Tao guojia fang School of Physics and Technology Wuhan UniversityWuhan 430000HubeiChina

So far,it's been widely acknowledged that the Pb I2decomposition under illumination mainly accounts for the degradation of perovskite solar cells(PSCs)under maximum power point(MPP)tracking ***,PSCs without excess Pb I2were also reported to deteriorate rapidly under the same ***,we demonstrate that the key to enhance PSCs stability under MPP tracking condition is not to have fascinating surface morphology with effective suppression of nonradiative recombination traps but to prevent the migration of iodine ion(I-)under light *** partially substituting methylammonium chloride(MACl)with methylammonium iodide(MAI)and simutaneouly introducing I2during the sequential deposition,the iodine vacancies in perovskite films are substantially suppressed,thereby limiting the pathways for I^(-)*** a consequence,PSCs with efficiency of 24.28%are fabricated with remarkably enhanced working stability.

关键词： Perovskite solar cell Degradation mechanism Light-induced halide ion migration MPP stability

Enhanced Power Conversion Efficiency in Bulk Heterojunction Polymer Solar Cells Through Dual-Interface Morphology Modification

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Wuhan University Journal of Natural Sciences 2013年第3期18卷 195-200页

作者： FAN Xi fang guojia School of Physics and Technology/Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education Wuhan University

Efficient bulk heterojunction（BHJ） polymer solar cells with a poly（3,4-ethylenedioxythiophene）：poly（styrenesulfonate） hole transfer layer（HTL） were fabricated via controlling the spin coating speed of the HTL solution on a particular fluorinated tin oxide substrates of a high *** shows that the functions of the photovoltaic devices increase with the increase of the HTL surface ***,an imprinting technique was employed to transfer a suitable pattern of nanostructure arrays to the surface of active *** the optimized spin coating speed,the photovoltaic devices exhibited a 28.4% increase in efficiency after this imprinting treatment compared with that of nonimprinted photovoltaic *** is mainly attributed to the achievement of high interface areas between active layers and electrodes,which not only increases optical absorption by scattering but also facilitates charge carrier collection.

关键词： interface morphology imprinting bulk heterojunction polymer solar cell

Transition metal oxides as hole-transporting materials in organic semiconductor and hybrid perovskite based solar cells

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Science China Chemistry 2017年第4期60卷 472-489页

作者： Pingli Qin Qin He Dan Ouyang guojia fang Wallace C.H. Choy Gang Li Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Hum Kowloon Hong Kong SAR China School of Science Wuhan Institute of Technology Wuhan 430073 China College of Post and Telecommunications Wuhan Institute of Technology Wuhan 430073 China Key Laboratory of Artificial Micro- and Nano-struetures of the Ministry of Education School of Physics and Technology Wuhan University Wuhan 430072 China Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong SAR China

Organic polymer solar cells （OSCs） and organic-inorganic hybrid perovskite solar cells （PSCs） have achieved notable progress over the past several years. A central topic in these fields is exploring electronically efficient, stable and effective hole-transporting layer （HTL） materials. The goal is to enhance hole-collection ability, reduce charge recombination, increase built-in voltage, and hence improve the performance as well as the device stability. Transition metal oxides （TMOs） semiconductors such as NiOx, CuOx, CrOx, MoOx, WO3, and V2O5, have been widely used as HTLs in OSCs. These TMOs are naturally adopted into PSC as HTLs and shows their importance. There are similarities, and also differences in applying TMOs in these two types of main solution processed solar cells. This concise review is on the recent developments of transition metal oxide HTL in OSCs and PSCs. The paper starts from the discussion of the cation valence and electronic structure of the transition metal oxide materials, followed by analyzing the structure-property relationships of these HTLs, which we attempt to give a systematic introduction about the influences of their cation valence, electronic structure, work ftmction and film property on device performance.

关键词： hole-transporting layer transition metal oxide perovskite solar cell organic solar cell

Organic-inorganic hybrid hole transport layers with SnS doping boost the performance of perovskite solar cells

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Journal of Energy Chemistry 2022年第5期31卷 637-645页

作者： Xiaolu Zheng Haibing Wang Feihong Ye Cong Chen Weijun Ke Wenjing Zhang Chuanxin He Yanlong Tai guojia fang College of Chemistry and Environmental Engineering Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060GuangdongChina Shenzhen Institute Wuhan UniversityShenzhen 518057GuangdongChina Key Laboratory of Human-Machine Intelligence-Synergy Systems of Chinese Academy of Sciences and Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina

Perovskite solar cells(PSCs) have demonstrated excellent photovoltaic performance which currently rival the long-standing silicon solar cells’ efficiency. However, the relatively poor device operational stability of PSCs still limits their future commercialization. Binary sulfide is a category of materials with promising optoelectrical properties, which shows the potential to improve both the efficiency and stability of *** we demonstrate that the inorganic tin monosulfide(Sn S) can be an efficient dopant in 2,2’,7,7’-tet rakis(N,N-di-p-methoxy-phenylamine)-9,9’-spirobifluorene(spiro-OMe TAD) to form a composite hole transport layer(HTL) for PSCs. Sn S nanoparticles(NPs) synthesized through a simple chemical precipitation method exhibit good crystallization and suitable band matching with the perovskites. The introduction of Sn S NPs in Spiro-OMTAD HTLs enhanced charge extraction, reduced trap state density, and shallowed trap state energy level of the devices based on the composite HTLs. Therefore, the resulting solar cells employing Sn S-doped spiro-OMe TAD HTLs delivered an improved stabilized power output efficiency of 21.75% as well as enhanced long-term stability and operational stability. Our results provide a simple method to modify the conventional spiro-OMe TAD and obtain PSCs with both high efficiency and good stability.

关键词： Perovskite solar cells SnS nanoparticles Trap state passivation Stability

Enhanced efficiency and stability of triple-cation perovskite solar cells with CsPbI_(x)Br_(3−x)QDs“surface patches”

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SmartMat 2022年第3期3卷 513-521页

作者： Guang Yang Hengkai Zhang Siqi Li Zhiwei Ren guojia fang Dangyuan Lei Gang Li Department of Electronic and Information Engineering Research Institute of Smart EnergyThe Hong Kong Polytechnic UniversityHong KongChina Key Laboratory of Artificial Micro‐and Nano‐structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhanChina Department of Materials Science and Engineering and Centre for Functional PhotonicsCity University of Hong KongHong KongChina Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina

Perovskite solar cells(PSCs)with a light-harvesting three-dimensional perovskite bulk layer as backbone component have achieved great progress in *** recombination is one major place to improve efficiency and stability as they cause significant energy loss in ***,an imperfection in grain boundaries will initiate device *** of the most successful strategies to decrease nonradiative recombination in PSCs is the introduction of reduced dimensional perovskite(e.g.,perovskite quantum wells),benefiting the device's efficiency and stability ***,instead of quantum wells,mixed-cation perovskites with ligand-contained CsPbBr_(x)I_(3−x)quantum dots(QDs)are prepared,which is shown to function as perovskite healing“surface patches.”Benefiting from the“surface patches”effect,the QDs-film shows reduced defects and enhancing film quality which lead to the excellent performance of solar cells(enhancing the power conversion efficiency from 19.21%of the control device to 21.71%[22.1%in reverse scan]).

关键词： perovskite solar cells CsPbI_(x)I_(3−x)QDs healing“surface patches” efficiency and stability enhancement

Antimony Potassium Tartrate Stabilizes Wide-Bandgap Perovskites for Inverted 4-T All-Perovskite Tandem Solar Cells with Efficiencies over 26%

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Nano-Micro Letters 2023年第7期15卷 204-217页

作者： Xuzhi Hu Jiashuai Li Chen Wang Hongsen Cui Yongjie Liu Shun Zhou Hongling Guan Weijun Ke Chen Tao guojia fang Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072People’s Republic of China

Wide-bandgap(WBG)perovskites have been attracting much attention because of their immense potential as a front light-absorber for tandem solar ***,WBG perovskite solar cells(PSCs)generally exhibit undesired large open-circuit voltage(VOC)loss due to light-induced phase segregation and severe non-radiative recombination ***,antimony potassium tartrate(APTA)is added to perovskite precursor as a multifunctional additive that not only coordinates with unbonded lead but also inhibits the migration of halogen in perovskite,which results in suppressed non-radiative recombination,inhibited phase segregation and better band energy ***,a APTA auxiliary WBG PSC with a champion photoelectric conversion efficiency of 20.35%and less hysteresis is *** maintain 80%of their initial efficiencies under 100 mW cm^(-2)white light illumination in nitrogen after 1,000 ***,by combining a semi-transparent WBG perovskite front cell with a narrow-bandgap tin–lead PSC,a perovskite/perovskite four-terminal tandem solar cell with an efficiency over 26%is *** work provides a feasible approach for the fabrication of efficient tandem solar cells.

关键词： Perovskite solar cell Tandem Wide bandgap Multifunctional additive

Defect Passivation on Lead-Free CsSnI_(3) Perovskite Nanowires Enables High-Performance Photodetectors with Ultra-High Stability

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Nano-Micro Letters 2022年第12期14卷 481-490页

作者： Zheng Gao Hai Zhou Kailian Dong Chen Wang Jiayun Wei Zhe Li Jiashuai Li Yongjie Liu Jiang Zhao guojia fang International School of Microelectronics Dongguan University of TechnologyDongguan 523808GuangdongPeople’s Republic of China Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhan 430072People’s Republic of China Faculty of Physics and Electronic Science Hubei UniversityWuhan 430062People’s Republic of China

In recent years,Pb-free CsSnI_(3) perovskite materials with excellent photoelectric properties as well as low toxicity are attracting much atten-tion in photoelectric ***,deep level defects in CsSnI_(3),such as high density of tin vacancies,structural deformation of SnI_(6)−octahedra and oxidation of Sn^(2+)states,are the major challenge to achieve high-performance CsSnI_(3)-based photoelectric devices with good *** this work,defect passivation method is adopted to solve the above issues,and the ultra-stable and high-performance CsSnI_(3) nanowires(NWs)photodetectors(PDs)are fabricated via incorporating 1-butyl-2,3-dimethylimidazolium chloride salt(BMIMCl)into *** materials analysis and theoretical calculations,BMIM+ions can effectively passivate the Sn-related defects and reduce the dark current of CsSnI_(3) NW *** further reduce the dark current of the devices,the polymethyl methacrylate is introduced,and finally,the dual passivated CsSnI_(3) NWPDs show ultra-high performance with an ultra-low dark current of 2×10^(-11) A,a responsivity of up to 0.237 A W^(−1),a high detectivity of 1.18×10^(12) Jones and a linear dynamic range of 180 ***,the unpackaged devices exhibit ultra-high stability in device performance after 60 days of storage in air(25℃,50% humidity),with the device performance remaining above 90%.

关键词： Pb-free Perovskite CsSnI_(3) Photodetector Nanowire

Alcohol-dispersed polymer complex as an effective and durable interface modifier for n-i-p perovskite solar cells

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Journal of Energy Chemistry 2024年第6期93卷 243-252,I0007页

作者： Chang Shi Jiangling Li Shuping Xiao Ziyi Wang Wuchen Xiang Rui Wu Yang Liu Yinhua Zhou Weijun Ke guojia fang Pingli Qin Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205HubeiChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina School of Physics and Technology Key Laboratory of Artificial Micro-and Nano-structures of the Ministry of Education and School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina

Abundant interfacial defects remain a significant challenge that hampers both the efficiency and stability of perovskite solar cells(PSCs).Herein,an alcohol-dispersed conducting polymer complex,denoted as PEDOT:F(Poly(3,4-ethylene dioxythiophene):Perfluorinated sulfonic acid ionomers),is introduced into the interface between perovskite and hole transporting layer in regular-structured ***:F serves as a multi-functional interface layer(filling grain boundaries and covering perovskite's grain-surface)to achieve a robust interaction with organic groups within perovskites,which could induce a structural transformation of PEDOT to increase its conductivity for the efficient ***,the strong interaction between PEDOT and perovskites could promote an effective coupling of undercoordinated Pb~(2+)ions with the lone electron pairs near O&S atoms in PEDOT molecules,thereby enhancing defect ***,PEDOT:F with inherent hydrophobic properties prevents effectively moisture invasion into perovskites for the improved long-term stability of the ***,the PEDOT:F-based PSCs achieved a champion efficiency of 24.81%,and maintained ca.92%of their initial efficiency after 7680 h of storage in a dry air environment,accompanied by the enhanced photothermal stability.

关键词： Alcohol-dispersed conducting polymer complex Interface passivation Grain boundaries Device stability Perovskite solar cells

Manipulating the morphology of CdS/Sb_(2)S_(3) heterojunction using a Mg-doped tin oxide buffer layer for highly efficient solar cells

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Journal of Energy Chemistry 2022年第3期31卷 374-381,I0010页

作者： Jiashuai Li Liangbin Xiong Xuzhi Hu Jiwei Liang Cong Chen Feihong Ye Jing Li Yongjie Liu Wenlong Shao Ti Wanga Chen Tao guojia fang Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665GuangdongChina Shenzhen Institute Wuhan UniversityShenzhen 518055GuangdongChina

Antimony sulfide(Sb_(2)S_(3))is an appealing semiconductor as light absorber for solar cells due to its high absorption coefficient,appropriate band gap(~1.7 e V)and abundance of constituent ***,power conversion efficiency(PCE)of Sb_(2)S_(3)-based solar cells still lags much behind the theoretically predicted due to the imperfect energy level alignment at the charge transporting layer/Sb_(2)S_(3)interfaces and hence severe charge ***,we insert a high-temperature sintered magnesium(Mg)-doped tin oxide(SnO_(2))layer between cadmium sulfide(Cd S)and fuorine doped tin oxide to form a cascaded energy level alignment and thus mitigate interfacial charge ***,the inserted Mg-doped Sn O_(2)buffer layer facilitates the growth of the neibouring Cd S film with orientation followed by Sb_(2)S_(3)film with larger grains and fewer ***,the resultant Sb_(2)S_(3)solar cells with Mg-doped SnO_(2)deliver a champion PCE of 6.31%,22.8%higher than those without a buffer *** work demonstrates that deliberate absorber growth as well as efficient hole blocking upon an appropriate buffer layer is viable in obtaining solution-processed Sb_(2)S_(3)solar cells with high performance.

关键词： Morphology Sb_(2)S_(3)solar cells Mg-doped tin oxide Orientation

Tin oxide(SnO_2) as effective electron selective layer material in hybrid organic–inorganic metal halide perovskite solar cells

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Journal of Energy Chemistry 2018年第4期27卷 962-970页

作者： Guang Yang Pingli Qin guojia fang Gang Li The Hong Kong Polytechnic University Shenzhen Research Institute.Shenzhen 518057 GuangdongChina Department of Electronic and Information Engineering The Hong Kong Polytechnic UniversityHong KongChina Key Laboratory of Artificial Micro-and Nano-strctures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina

The emergence of hybrid organic-inorganic metal halide perovskite solar cells （PSCs） causes a break through in the solar technology recently due to its fabrication processes. The dramatic enhancenlent in in 2009 to the recent certified record PCE of 22.7% superior optoelectronic properties and the low-cost power conversion efficiency （PCE） of PSCs flom 3.8% ndicates huge potential of PSCs for future high efficiency and large scale photovoltaic manufacturing. The electron selective layer （ESL） plays an important role in electron extraction and hole blocking function in PSCs, and there have been great interest in developing efficient ESL materials. Recently, tin oxide （SnO2） as an ESL has attracted significant research attentions owing to its low temperature preparation processes as well as yielding high PCE and good stability of PSCs. In this perspective article, we focus on the development progress of SnO2 as an ESL m PSCs, and discuss the strategies for preparing SnO2 to achieve PSCs with high efficiency, less hysteresis and good device stability.

关键词： Tin oxide Electron selective layers Perovskite solar cells Low temperature preparation