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An Unprecedented Efficiency with Approaching 21%Enabled by Additive‑Assisted Layer‑by‑Layer Processing in Organic Solar Cells

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Nano-Micro Letters 2025年第2期17卷 372-375页

作者： Shuai Xu Youdi Zhang Yanna Sun pei cheng Zhaoyang Yao Ning Li Long Ye Lijian Zuo Ke Gao Key Laboratory of Advanced Green Functional Materials College of ChemistryChangchun Normal UniversityChangchun 130032People’s Republic of China Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion School of Chemistry and Chemical EngineeringShandong UniversityQingdao 266237People’s Republic of China College of Polymer Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China State Key Laboratory and Institute of Elemento‑Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071People’s Republic of China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640People’s Republic of China Tianjin Key Laboratory of Molecular Optoelectronic Sciences School of Materials Science and EngineeringTianjin UniversityTianjin 300350People’s Republic of China State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China

Recently published in Joule,Feng Liu and colleagues from Shanghai Jiaotong University reported a record-breaking 20.8%power conversion efficiency in organic solar cells(OSCs)with an interpenetrating fibril network active layer morphology,featuring a bulk p-in structure and proper vertical segregation achieved through additive-assisted layer-by-layer *** optimized hierarchical gradient fibrillar morphology and optical management synergistically facilitates exciton diffusion,reduces recombination losses,and enhances light capture *** approach not only offers a solution to achieving high-efficiency devices but also demonstrates the potential for commercial applications of OSCs.

关键词： Organic solar cells Additive-assisted layer-by-layer processing Three-dimensional fibril morphology Bulk p-i-n structure Optical management

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Unraveling the impacts of intermolecular interaction on morphology evolution for highly efficient organic solar cells and modules

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Science China Chemistry 2025年第1期 264-272页

作者： Xueqing Ma Yingying cheng Yuqiang Liu Xinming Zheng Guangliu Ran Hongxiang Li Xinyue Cui Andong Zhang Wenkai Zhang pei cheng Wenchao Huang Zhishan Bo Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University College of Textiles and Clothing State Key Laboratory of Bio-fibers and Eco-textiles Qingdao University Key State Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of Technology Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum Studies Beijing Normal University State Key Laboratory of Polymer Materials Engineering College of Polymer Science and Engineering Sichuan University

Understanding the effect of intermolecular interaction on the growth dynamic of active layers is critical for advancing organic solar cells(OSCs). However, the diverse structure of donors and acceptors makes the research challenging. Additives with customizable structures and properties could simplify this complexity. Herein, we meticulously tailor two additives of 3,4-ethylenedioxythiophene(EDOT) and 2,5-dibromo-3,4-ethylenedioxythiophene(DBEDOT), possessing distinct intermolecular interaction features to elaborate the inherent relationship. It is found that varied interaction strengths can alter film formation processes. The enhanced intermolecular interaction between the DBEDOT and non-fullerene acceptor BTP-e C9-4F results in pre-aggregation and longer crystallization duration of BTP-e C9-4F, facilitating the formation of films with compact molecular packing and decent phase separation. Thus, exciton dissociation and charge transport become more efficient. Finally, devices processed with DBEDOT exhibit a remarkable power conversion efficiency of 19.35% in small-area OSCs and 14.11% in bladecoated 5 cm × 5 cm organic solar mini-modules. Especially, OSCs can maintain 80% of their initial efficiency after continuous annealing at 85 °C for over 2,100 h.

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Delay-dependent exponential stability of impulsive stochastic systems with time-varying delay

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Journal of Systems Engineering and Electronics 2011年第5期22卷 799-809页

作者： pei cheng Feiqi Deng Yunjian Peng Systems Engineering Institute South China University of Technology Guangzhou 510640 P. R. China School of Mathematical Science Anhui University Hefei 230039 P. R. China

The problem of delay-dependent exponential stability is investigated for impulsive stochastic systems with time-varying delay. Although the exponential stability of impulsive stochastic delay systems has been discussed by several authors, few works have been done on delay-dependent exponential stability of impulsive stochastic delay systems. Firstly, the Lyapunov-Krasovskii functional method combing the free-weighting matrix approach is applied to investigate this problem. Some delay-dependent mean square exponential stability criteria are derived in terms of linear matrix inequalities. In particular, the estimate of the exponential convergence rate is also provided, which depends on system parameters and impulsive effects. The obtained results show that the system will stable if the impulses＇ frequency and amplitude are suitably related to the increase or decrease of the continuous flows, and impulses may be used as controllers to stabilize the underlying stochastic system. Numerical examples are given to show the effectiveness of the results.

关键词： impulsive stochastic systems time-varying delay exponential stability linear matrix inequality (LMI).

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Recent progress in reactivity study and synthetic application of N-heterocyclic phosphorus hydrides

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National Science Review 2021年第4期8卷 181-194页

作者： Jingjing Zhang Jin-Dong Yang Jin-pei cheng Center of Basic Molecular Science Department of Chemistry Tsinghua University State Key Laboratory of Elemento-Organic Chemistry College of Chemistry Nankai University

N-heterocyclic phosphines(NHPs) have recently emerged as a new group of promising catalysts for metal-free reductions, owing to their unique hydridic reactivity. The excellent hydricity of NHPs, which rivals or even exceeds those of many metal-based hydrides, is the result of hyperconjugative interactions between the lone-pair electrons on N atoms and the adjacent σ*(P–H) orbital. Compared with the conventional protic reactivity of phosphines, this umpolung P–H reactivity leads to hydridic selectivity in NHP-mediated reductions. This reactivity has therefore found many applications in the catalytic reduction of polar unsaturated bonds and in the hydroboration of pyridines. This review summarizes recent progress in studies of the reactivity and synthetic applications of these phosphorus-based hydrides, with the aim of providing practical information to enable exploitation of their synthetically useful chemistry.

关键词： N-heterocyclic phosphine diazaphospholene hydride transfer metal-free reduction σ-bond metathesis

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Clinical value of circular RNAs and autophagy-related mi RNAs in the diagnosis and treatment of pancreatic cancer

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Hepatobiliary & Pancreatic Diseases International 2019年第6期18卷 511-516页

作者： pei-cheng Jiang Shu-Rui Bu Department of Gastroenterology and Hepatology Jinshan Hospital Affiliated to Fudan University

Background:Circular RNAs(circRNAs)are a special group of long-chain and non-coding RNAs characterized by a closed-loop structure without 3’and 5’*** recent years,studies have demonstrated that circRNAs act as microRNA(miRNA)sponges to regulate the function of *** evidence indicates that circRNAs and targeted miRNAs are involved in the development,progression and metastasis of various cancers and drug resistance.A number of miRNAs are known to be associated with the pathogenesis,development and treatment of pancreatic cancer by regulating the autophagic *** sources:A comprehensive literature search was executed in PubMed and EMBASE using the medical subject headings(MeSH)terms“Pancreatic Neoplasms”,“autophagy”,“RNA,circular”and“microRNA”.We also used text terms such as“diagnosis”,“prognosis”and“biomarker”to supplement the ***:Autophagy-related miRNAs is closely related to pancreatic *** basis of the retrieval results,we summarized the synthesis,features and functions of circRNAs and analyzed the association between autophagy-related miRNAs and pancreatic ***:circRNAs act as the miRNA sponges and there is an association between miRNAs and autophagy,which provides a new concept to broaden the knowledge about the mechanisms underlying the development,progression and metastasis of pancreatic ***,clinical value of circRNAs and autophagy-related miRNAs in the diagnosis and treatment of pancreatic cancer would be further verified with in-depth researches.

关键词： Autophagy Circular RNAs miRNA sponge Pancreatic cancer

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Exponential Synchronization of Delayed Stochastic Complex Dynamical Networks via Hybrid Impulsive Control

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 785-787页

作者： Yao Cui pei cheng Xiaohua Ge the School of Mathematic Science Anhui UniversityHefei 230601China IEEE the School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourne VIC 3122Australia

Dear Editor,This letter addresses the synchronization problem of a class of delayed stochastic complex dynamical networks consisting of multiple drive and response *** aim is to achieve mean square exponential synchronization for the drive-response nodes despite the simultaneous presence of time delays and stochastic noises in node dynamics.

关键词： dynamics stochastic letter

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Quinine-derived thiourea promoted enantioselective Michael addition reactions of 3-substituted phthalides to maleimides

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Science China Chemistry 2019年第5期62卷 649-652页

作者： Jie Wang Xin Li Jin-pei cheng State Key Laboratory of Elemento-Organic Chemistry Collaborative Innovation Center of Chemical Science and EngineeringCollege of ChemistryNankai University

A highly diastereoselective and enantioselective Michael addition/desymmetrization reaction of maleimides with prochiral 3-substituted phthalides catalyzed by quinine-derived bifunctional thiourea was realized. A broad range of the 3,3′-disubstituted phthalides bearing vicinal quaternary-tertiary stereogenic centers were synthesized in moderate to good yields(up to 96%) with high diastereoselectivities(up to >19:1 dr) and enantioselectivities(up to 96:4 er).

关键词： michael addition 3,3′-disubstituted phthalides vicinal quaternary-tertiary stereogenic centers

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A New Flavonoid Ketohexofuranoside from Leaves of Crataegus pinnatifida ***. major ***.

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Chinese Chemical Letters 2000年第10期11卷 895-896页

作者： pei cheng ZHANG Sui Xu XU Institute of Materia Medica Chinese Academy of Medical Science and Peking Union Medical CollegeBeijing 100050 Department of Phytochemistry Shenyang Pharmaceutical UniversityShenyang 110015

A new flavonoid, namely pinnatifine I (1), was isolated from the leaves of Crataegus pinnatifida Bge. var. major ***.. Its structure was elucidated by spectroscopic analysis and chemical evidence.

关键词： Crataegus pinnatifida Bge.var.major NEBr. Rosaceae pinnatifine I flavonoid Ketohexofuranoside

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Infectious Diseases of Poverty 2020年第2期9卷 96-97页

作者： Jun-Fang Xu pei-cheng Wang Feng cheng 不详 Research Center for Public Health School of MedicineTsinghua UniversityBeijingChina

Background:By the end of October 2019,there were 958 thousand people were reported living with HIV/AIDS in *** lifestyle factors,such as smoking,drinking alcohol,using illicit drugs and no physical activity have been found to mitigate the positive impact of antiretroviral therapy(ART)on viral load and HIV-related quality of ***,risky sexual behavior among HIV-positive persons places their partners at risk for HIV transmission and other sexually transmitted *** aim of the study is to determine the prevalence of unhealthy behavior of people living with HIV/AIDS and related influencing factors,particularly those that are closely connected with HIV infection and ART ***:An institutional based cross-sectional study design was used to collect data from people living with HIV/AIDS(PLWHA)in Beijing and Yunnan *** following information was included in the questionnaire survey:social-demographic characteristics,health behavior information,sexual risk *** logistic regression model was conducted to analyze the influencing factors of unhealthy general health behaviors and risky sexual ***:In total,2575 PLWHA were included in the study and 78.3%(2017/2575)were *** the general health behaviors,34.2%(987/2544)smoke;33.8%(870/2575)drank alcohol and 2.3%(49/2134)reported the use of illicit drugs in the previous 6 *** the sexual behaviors perspective,59.0%(1519/2575)had sex in the previous 6 *** people who had sex,92.0%(1398/1519)had fixed sexual *** those with no fixed sexual partner,38.0%(46/121)had more than three *** men who had sex,34.7%(448/1292)reported having sex with men in the previous 6 months and 167%(75/448)of these had group sexual *** participants,72.2%(1053/1458)used condoms every time they had sex while 6.4%(94/1458)of people never used *** people living with HIV/AIDS were more likely to have sexual risk behaviors(adjusted odd

关键词： Health related behavior HIV-infected people Link to care China

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Effect of electron-withdrawing units on triphenylamine-based small molecules for solution-processed organic solar cells

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Science China Chemistry 2015年第2期58卷 331-338页

作者： Yifan Wang Huitao Bai pei cheng Mingyu Zhang Xiaowei Zhan CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Materials Science and Engineering College of Engineering Peking University

Organic small molecules （TPA-BT3T, TPA-PT3T, and TPA-DFBT3T） using triphenylamine as a donor unit, terthiophene as a bridge, and benzo-2,1,3-thiadiazole （BT）, [1,2,5]thiadiazolo[3,4-e]pyridine （PT） or 5,6-difluorobenzo[c][1,2,5]thiadiazole （DFBT） as an acceptor unit were designed and synthesized through Suzuki coupling reactions. These molecules exhibited good thermal stability with decomposition temperatures over 380℃ and broad absorption from 300 to 700 nm. Photovoltaic devices were fabricated with these small molecules as donors and PC71BM as an acceptor. The TPA-BT3T based devices exhibited a power conversion efficiency of 2.89%, higher than those of the TPA-PT3T- and TPA-DFBT3T-based devices （1.34% and 1.54% respectively）. The effects of electron-withdrawing units on absorption, energy level, charge transport, morphology, and photovoltaic properties also were investigated.

关键词： organic solar cell small molecule triphenylamine electron-withdrawing unit

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