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Enhancing the performance of organic solar cells by modification of cathode with a self-assembled monolayer of aromatic organophosphonic acid

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Chinese Chemical Letters 2023年第4期34卷 526-530页

作者： Wenlong Liu Hao Lu Yan Zhang Hao Huang Xinming Zheng Yahui Liu Youzhi Wu Xinjun Xu School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China College of Textiles&Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China

We use a single-molecule self-assembled layer of an aromatic organophosphonic acid(2PACz) to modify the cathode interface layer in inverted organic solar cells(OSCs). The modified OSCs not only have an obvious improvement in power conversion efficiency(PCE), but also demonstrate greatly enhanced air stability. Ultraviolet photoelectron spectroscopy shows that the work function of cathode interlayer after modification by 2PACz is more suitable for electron extraction. In addition, the surface energy is reduced without affecting the film deposition, which will be beneficial to reduce the interfacial traps. As a result,the PCE of OSCs based on the PBDB-T:IT-M system is increased, and its stability in air is greatly improved(remaining 88% of its initial PCE after 555 h in air). Therefore, we provide a new strategy for constructing high-performance non-fullerene OSCs with enhanced air stability.

关键词： organic solar cells Interface modification Self-assembled monolayer Stability PCE

Perylene-diimide-based cathode interlayer materials for high performance organic solar cells

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SusMat 2022年第3期2卷 243-263页

作者： Jia Yao Qi Chen Cen Zhang Zhi-Guo Zhang Yongfang Li State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China

organic solar cells(OSCs),benefiting from their significant advantages,such as light weight,flexibility,low cost,and large area manufacturing adaptability,are considered promising clean energy ***,the power conversion efficiency(PCE)of state-of-the-art OSCs has reached over 18%through materials and device ***,cathode engineering with cathode interlayer materials(CIMs)is an important strategy to improve the PCEs and stability of *** various CIMs reported in the literature,perylene diimides(PDIs)aremore appropriate for working as cathode interlayers in OSCs owing to their distinct advantages of suitable energy levels,high electron affinity,high electron mobility,and facile *** this review,the mechanism of cathode engineering is concisely summarized,and recent research progress on PDI derivatives working as CIMs in OSCs is systematically ***,prospects and suggestions are provided for the development of PDI-based CIMs for practical applications.

关键词： cathode interlayers organic solar cells perylene-diimide

Hot-electron emission-driven energy recycling in transparent plasmonic electrode for organic solar cells

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InfoMat 2022年第3期4卷 121-130页

作者： Jing-De Chen Ling Li Chao-Chao Qin Hao Ren Yan-Qing Li Qing-Dong Ou Jia-Jia Guo Shi-Jie Zou Feng-Ming Xie Xianjie Liu Jian-Xin Tang Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Institute of Functional Nano&Soft Materials(FUNSOM)Soochow UniversitySuzhouJiangsuChina College of Physics and Materials Science Henan Normal UniversityXinxiangHenanChina School of Physics and Electronic Science Ministry of Education Nanophotonics&Advanced Instrument Engineering Research CenterEast China Normal UniversityShanghaiChina Department of Materials Science and Engineering Monash UniversityClaytonVictoriaAustralia Laboratory of organic Electronics Department of Science and Technology(ITN)Linköping UniversityNorrköpingSweden Macao Institute of Materials Science and Engineering(MIMSE) Macao University of Science and TechnologyTaipaMacao SARChina

Plasmonic metal electrodes with subwavelength nanostructures are promising for enhancing light harvesting in ***,the nonradiative damping of surface plasmon polaritons(SPPs)during coupling with sunlight results in the conversion of the excited hot-electrons to heat,which limits the absorption of light and generation of ***,an energy recycling strategy driven by hotelectron emission for recycling the SPP energy trapped in the plasmonic electrodes is proposed.A transparent silver-based plasmonic metal electrode(A-PME)with a periodic hexagonal nanopore array is constructed,which is combined with a luminescent organic emitter for radiative recombination of the injected *** to the suppressed SPP energy loss via broadband hot-electron emission,the A-PME achieves an optimized optical transmission with an average transmittance of over 80%from 380 to 1200 ***,the indium-tin-oxide-free organic solar cells yield an enhanced light harvestingwith a power conversion efficiency of 16.1%.

关键词： energy recycling hot-electron emission organic solar cells plasmonic electrode surface plasmon polariton

A Two-in-One Annealing Enables Dopant Free Block Copolymer Based organic solar cells with over 16% Efficiency

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Chinese Journal of Chemistry 2023年第7期41卷 672-678页

作者： Shangfei Yao Linji Yang Shasha Shi Yang Zhou Min Long Wenhao Zhang Songlin Cai Ciyuan Huang Tao Liu Bingsuo Zou Guangxi Key Lab of Processing for Nonferrous Metals and Featured Materials and Key Lab of New Processing Technology for Nonferrous Metals and Materials Ministry of EducationSchool of Physical Science and Technology and School of ResourcesEnvironments and MaterialsGuangxiUniversityNanningGuangxi 530004China

The organic solar cells(OSCs)based on block copolymer systems bear the hope of achieving the optimal balance of power conversion efficiency(PCE)and stability,but the key index,PCE of this type devices is still *** improve the efficiency,regulating the thin-film morphology is always the core engineering,which is usually achieved via two aspects:precursor optimization and post treatments.

关键词： Block copolymer system Morphology Post treatment organic solar cells Efficiency

Recent progress in low-cost noncovalently fused-ring electron acceptors for organic solar cells

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Aggregate 2022年第6期3卷 43-59页

作者： Qingqing Bai Qiming Liang Henan Li Huiliang Sun Xugang Guo Li Niu Center for Advanced Analytical Science School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhouPR China Guangzhou Key Laboratory of Sensing Materials and Devices GuangzhouPR China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhenPR China

The power conversion efficiencies(PCEs)of organic solar cells(OSCs)have improved considerably in recent years with the development of fused-ring electron acceptors(FREAs).Currently,FREAs-based OSCs have achieved high PCEs of over 19%in single-junction *** the relatively high synthetic complexity and the low yield of FREAs typically result in high production costs,hindering the commercial application of *** contrast,noncovalently fused-ring electron acceptors(NFREAs)can compensate for the shortcomings of FREAs and facilitate large-scale industrial production by virtue of the simple structure,facile synthesis,high yield,low cost,and reasonable *** present,OSCs based on NFREAs have exceeded the PCEs of 15%and are expected to reach comparable efficiency as FREAs-based ***,recent advances in NFREAs in this review provide insight into improving the performance of *** particular,this paper focuses on the effect of the chemical structures of NFREAs on the molecule conformation,aggregation,and packing *** molecular design strategies,such as core,side-chain,and terminal group engineering,are *** addition,some novel polymer acceptors based on NFREAs for all-polymer OSCs are also *** the end,the paper provides an outlook on developing efficient,stable,and low-cost NFREAs for achieving commercial applications.

关键词： low cost noncovalently fused-ring electron acceptors organic solar cells

A generic approach yields organic solar cells with enhanced efficiency and thermal stability

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聚集体(英文)

聚集体(英文) 2023年第2期4卷 318-328页

作者： Mengyuan Gao Kai Zhang Chunyong He Hanqiu Jiang Xiong Li Qingchun Qi Kangkang Zhou Yu Chen Wenchao Zhao Long Ye School of Materials Science and Engineering Tianjin Key Laboratory of Molecular Optoelectronic SciencesTianjin UniversityCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)TianjinChina Spallation Neutron Source Science Center DongguanChina Institute of High Energy Physics Chinese Academy of Sciences(CAS)BeijingChina Mettler Toledo ShanghaiChina Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjingChina

The use of deuterium are critical for promoting the fundamental understanding of aggregate materials and their new ***,the solution structure of conjugated polymers can be hardly resolved without ***,studies about the isotopic effects of casting solvents on the aggregated structures of photovoltaic polymers and their bulk-heterojunction blends are ***,the impact of deuterated solvents on the thermal behavior,aggregated structures,and device performance of photovoltaic polymers is clearly delineated for the first time by multiple *** enhanced π-π stacking order of photovoltaic polymers is highly relevant to their relatively poor miscibility with deuterated *** from higher crystallinity and optimized morphology of deuterated solvents processed films,the devices are able to achieve better efficiency and notable improvement in thermal *** results highlight the isotopic effects of solvents on the aggregated structure of conjugated polymer systems and reveal the potential of innovative approaches to fabricate thermally stable high-efficiency solar cells.

关键词： deuterated solvent organic solar cells phase separation scattering thermal stability

Low-cost and efficient organic solar cells based on polythiopheneand poly(thiophene vinylene)-related donors

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Aggregate 2022年第3期3卷 48-58页

作者： Chenyi Yang Shaoqing Zhang Jianhui Hou School of Chemistry and Biology Engineering University of Science and Technology BeijingBeijingChina State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijingChina

At present,most of state-of-the-art power conversion efficiencies(PCEs)of organic solar cells(OSCs)are achieved from the photoactive materials involving donor–acceptor(D–A)copolymer *** is well known that the complicated molecular structure of D–A copolymers means the tedious synthesis,which brings about severe cost issue and poor scalability for the industrial ***,to develop application-oriented OSCs,considerable attention should be paid on simplifying the chemical structures of polymer ***(PT)and poly(thiophene vinylene)(PTV)derivatives should be among the simplest polymer donors,and OSCs based on them have made some breakthroughs in past 2 ***,we briefly introduce the recent advances of OSCs based on low-cost polymers including poly(3-hexylthiophene)(P3HT),PT derivatives,and PTV derivatives,respectively,and emphasize the importance of modulating energy levels,preaggregation effect,and D/A miscibility for the past progress as well as the future *** last,we also propose some challenges demanding prompt solution for realizing practical application of OSCs,aiming at providing guidance and stimulating new ideas for further research.

关键词： low cost organic solar cells poly(thiophene vinylene) poly(3-hexylthiophene) polythiophene

Heating-induced aggregation control for efficient sequential-cast organic solar cells

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Aggregate 2022年第3期3卷 19-26页

作者： Donghui Li Chuanhang Guo Xue Zhang Baocai Du Pang Wang Shili Cheng Jinlong Cai Hui Wang Dan Liu Huifeng Yao Jianhui Hou Tao Wang School of Materials Science and Engineering Wuhan University of TechnologyWuhanChina State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina

The aggregation and morphology within the photoactive layer is of considerable significance to boost the power-conversion efficiency(PCE)of organic solar cells(OSCs).Herein,heating-induced aggregation control of nonfullerene acceptor BTPeC7 during sequential casting was *** large aggregates of BTP-eC7 can be significantly reduced by sequential casting of BTP-eC7 hot solution on the D18 fibrillar layer,and further eliminated by sequential casting of BTP-eC7 hot solution on the D18 fibrillar layer heated on hot substrate,leading to stronger faceonπ–πstacking and appropriate phase separation within the photoactive layer to promote exciton dissociation and charge *** maximum PCE of D18/BTPeC7 solar cells can be enhanced from 8.1%of room temperature casting to 15.9%of hot solution,hot-substrate casting,therefore demonstrates that heating-induced aggregation and sequential-casting strategies are a promising approach in improving the performance of OSCs employing nonfullerene acceptors with limited solubility or strong crystallization ability.

关键词： aggregation heating nonfullerene acceptors organic solar cells sequentialcast

A Thiazole-Based Polymer Donor for Efficient organic solar cells

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Transactions of Tianjin University 2022年第5期28卷 398-405页

作者： Ye Xu Huifeng Yao Tao Zhang Lijiao Ma Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The development of new materials plays a critical role in improving the efficiency of organic solar cells(OSCs).At present,the relatively high-lying highest occupied molecular orbital(HOMO)level of the high-efficiency polymer donor is regarded as one of the main reasons for the low open-circuit voltage(V_(OC)).In this work,we introduced the strong electron-withdrawing thiazole unit into the construction of a polymer *** designed and prepared an alternating donor-acceptor material,namely PSZ,by copolymerizing 4-methyl thiazole with an electron-donating benzodithiophene unit and studied its application in high-efficiency *** optical and electrical properties of the new material were characterized by UV-Vis absorption spectroscopy and electrochemical cyclic *** show that PSZ is a typical wide-bandgap material with a high optical bandgap of 2.0 eV and a deep HOMO level of-5.70 *** a non-fullerene BTP-eC9 was selected as the acceptor material,V_(OC) reached 0.88 V in the resulting device,and the corresponding power conversion efficiency(PCE)was8.15%.In addition,when PSZ was added as the third component to the binary photoactive combination with PBDB-TF as the donor and BTP-eC9 as the acceptor,V_(OC) of the cell device could be increased,thereby obtaining a high PCE of 17.4%.These results indicated that introducing thiazole units into polymer donors can remarkably reduce the HOMO levels and improve V_(OC) and PCE in OSCs.

关键词： organic solar cells Energy conversion efficiency Polymer donor Thiazole unit