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| 1 | Simultaneous Optimization of Efficiency,Stretchability,and Stability in All-Polymer Solar Cells via Aggregation Control显示文摘With the emergence of Y-series small molecule acceptors,polymerizing the small molecule acceptors with aromatic linker units has attracted significant research attention,which has greatly advanced the photovoltaic performance of all-polymer solar cells.Despite the rapid increase in efficiency,the unique characteristics(e.g.,mechanical stretchability and flexibility)of all-polymer systems were still not thoroughly explored.In this work,we demonstrate an effective approach to simultaneously improve device performance,stability,and mechanical robustness of all-polymer solar cells by properly suppressing the aggregation and crystallization behaviors of polymerized Y-series acceptors.Strikingly,when introducing 50 wt%PYF-IT(a fluorinated version of PY-IT)into the well-known PM6:PY-IT system,the all-polymer devices delivered an impressive photovoltaic efficiency of 16.6%,significantly higher than that of the control binary cell(15.0%).Compared with the two binary systems,the optimal ternary blend exhibits more efficient charge separation and balanced charge transport accompanying with less recombination.Moreover,a high-performance 1.0 cm^(2)large-area device of 15%efficiency was demonstrated for the optimized ternary all-polymer blend,which offered a desirable PCE of 14.5%on flexible substrates and improved mechanical flexibility after bending 1000 cycles.Notably,these are among the best results for 1.0 cm^(2)all-polymer OPVs thus far.This work also heralds a bright future of all-polymer systems for flexible wearable energy-harvesting applications. | Kaihu Xian Kangkang Zhou Mingfei Li Junwei Liu Yaowen Zhang Tao Zhang Yong Cui Wenchao Zhao Chunming Yang Jianhui Hou Yanhou Geng Long Ye | 2023 | Chinese Journal of Chemistry2023，41，2： | 1 |
| 2 | Heating induced aggregation in non-fullerene organic solar cells towards high performance显示文摘Molecular ordering within the photoactive layer plays a crucial role in determining the device performance of organic solar cells(OSCs).However,the simultaneous molecular ordering processes of polymer donors and non-fullerene acceptors(NFAs)during solution casting usually bring confinement effect,leading to insufficient structural order of photovoltaic components.Herein,the molecular packing of mINPOIC NFA is effectively formed through a heating induced aggregation strategy,with the aggregation of PBDB-T,which has a strong temperature dependence,is retarded by casting on a preheated substrate to reduce its interference toward m-INPOIC.A sequent thermal annealing treatment is then applied to promote the ordering of PBDB-T and achieve balanced aggregation of both donors and acceptors,resulting in the achievement of a maximum efficiency of 13.9% of PBDB-T:m-INPOIC binary OSCs.This work disentangles the interactions of donor polymer and NFA during the solution casting process and develops a rational strategy to enhance the molecular packing of NFAs to boost device performance. | Baocai Du Renyong Geng Wenliang Tan Yuchao Mao Donghui Li Xue Zhang Dan Liu Weihua Tang Wenchao Huang Tao Wang | 2021 | Journal of Energy Chemistry2021，30，3： | 0 |
| 3 | Refining acceptor aggregation in nonfullerene organic solar cells to achieve high efficiency and superior thermal stability显示文摘With the rapid increase in photoelectric conversion efficiency of organic photovoltaics(OPVs),prolonging the operational lifetime of devices becomes one of the critical prerequisites for commercial applications.Guided by the theoretical calculations of molecular stacking and miscibility,we proposed an effective approach to simultaneously improve device performance and thermal stability of high-efficiency OPVs by refining the aggregation of Y-series acceptors.The key to this approach is deliberately designing an asymmetric Y-series acceptor,named Y6-CNO,which acts as a third component regulator to finely tune the degree of acceptor aggregation and crystallization in the benchmark PM6:Y6-BO system.Strikingly,a champion photovoltaic efficiency of 18.0%was achieved by introducing 15 wt%Y6-CNO into the PM6:Y6-BO system,significantly higher than the control binary cell(16.7%).Moreover,annealing at 100°C for over 1,200 h does not markedly affect the photovoltaic performance of the optimal ternary devices,maintaining above 95%of the initial performance and exhibiting an exceptionally high T_(80)lifetime of 9,000 h under continuous thermal annealing.By contrast,binary devices suffer from excessive crystallization of acceptors with long-term annealing.Additionally,mixing thermodynamics combined with morphological characterizations were employed to elucidate the microstructure-thermal stability relationships.The ternary OPVs consisting of symmetric and asymmetric homologous acceptors form better charge transport channels and can effectively suppress excessive aggregation of acceptors under long-term annealing.This work demonstrates the effectiveness of refining acceptor aggregation via molecular design for highly efficient and stable nonfullerene-based OPVs. | Kaihu Xian Shengnan Zhang Ye Xu Junwei Liu Kangkang Zhou Zhongxiang Peng Mingfei Li Wenchao Zhao Yu Chen Zhuping Fei Jianhui Hou Yanhou Geng Long Ye | 2023 | Science China Chemistry2023，66，1： | 0 |
| 4 | Nucleotide Recognition by a Guanidinocalixarene Receptor in Aqueous Solution显示文摘Nucleotides participate in various physiological processes through their supramolecular interactions with biomolecules.Therefore,the molecular recognition of nucleotides became an important topic in supramolecular chemistry and exhibited many biomedical applications.Guanidinocalixarenes showed very strong binding affinities towards nucleotides,even reaching the nanomolar level.In this work,we systematically determined the binding constants between a typical guanidinocalixarene(guanidinium-modified calix[5]arene,GC5A)and various nucleotides and revealed the driving forces behind the molecular recognition using theoretical calculations.The electrostatic interactions and hydrogen bonding provided by the phosphate groups of the nucleotides dominated the binding between the nucleotides and GC5A.The lower rim alkyl chains and the skeleton of GC5A provide preorganized cavity and upper guanidinium groups.The difference in the type of nucleobase is also attributed to the different binding affinities.This work provides insight into the molecular recognition of nucleotides and facilitates the development of new supramolecular hosts for nucleotides and related biological applications. | GENG Wenchao ZHENG Zhe JIANG Huifeng GUO Dongsheng | 2023 | Chemical Research in Chinese Universities2023，39，1： | 0 |
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