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Carbon Energy 2023年第7期5卷 27-37页

作者： Chang-Mok Oh Sujung Park Jihoon Lee Sung Heum Park Shinuk Cho In-Wook Hwang Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangjuRepublic of Korea Department of Physics and Energy Harvest Storage Research Center University of UlsanUlsanRepublic of Korea Department of Physics Pukyong National UniversityBusanRepublic of Korea

Bulk heterojunction(BHJ)composites show improved power conversion efficiencies when optimized in terms of morphology using various film processing methods.A reduced carrier recombination loss in an optimized BHJ was characterized ***,the driving force that leads to this reduction was not clearly *** this study,we focus on the decreased carrier recombination loss and its driving force in optimized nonfullerene acceptor-based PTB7-Th:IEICO-4F BHJ *** demonstrate that the optimized BHJ shows deactivation in the sub-nanosecond nongeminate carrier recombination *** driving force for this deactivation was determined to be the improved interchain hole delocalization between the *** enhanced interchain hole delocalization was observed using steady-state photoinduced absorption(PIA)*** particular,increased splitting between the polaron PIA bands was ***,improved interchain hole delocalization was observed for other state-of-the-art BHJ materials,including D18:Y6 with optimized morphologies.

关键词： bulk heterojunction interchain hole delocalization nonfullerene acceptor photoinduced absorption spectroscopy solar cell

Effect of Hyperconjugation on Photovoltaic Performance in Pseduo-2D Perylene Diimide Derivatives

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Chinese Journal of Chemistry 2024年第7期42卷 725-730页

作者： Zhilong He Yuwen Hong Guangyu Li Tong Shan Yi Zhang Hongliang Zhong Schoolof Chemistry and Chemical Engineering Shanghai Key Lab of Electrical Insulation and Thermal AgingShanghai Jiao Tong UniversityShanghai200230China Shanghai Institute of Organic Chemistry Chinese Academy of SciencesShanghai 200032China Shenzhen Research Institute Shanghai Jiao Tong UniversityShenzhenGuangdong 518057China

Theπ-πinteraction is acknowledged as the predominant factor to determine the molecular packing in organic photovoltaic materials,while other non-covalent intermolecular interactions especially theσ-πhyperconjugation are often ***,a perylene diimide(PDI)derivative named FIDT-PDI is designed and synthesized to shed light into the effect of hyperconjugation on the molecular packing and further the photovoltaic *** NMR and 2D NOE NMR demonstrate the formation of intermolecularσ-πhyperconjugation between the C—H bond of the PDI moiety in one molecule and the phenyl sidechain in another molecule of *** from theσ-πhyperconjugation,FIDT-PDI with twisted backbone reversely exhibits more ordered packing and stronger crystallinity compared with another PDI derivative FIDTT-PDI which has better planarity,consequently achieving superior PCE and higher carrier *** contribution is the first paradigm to unravel the structure-property relationship betweenσ-πhyper-conjugation of conjugated materials and corresponding photovoltaic performance.

关键词： Hyperconjugation Weak intermolecular interactions Conformation Organic solar cells nonfullerene acceptor Perylene diimide

Control over π-π stacking of heteroheptacene-based nonfullerene acceptors for 16% efficiency polymer solar cells

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National Science Review 2020年第12期7卷 1886-1895页

作者： Yunlong Ma Dongdong Cai Shuo Wan Pan Yin Pengsong Wang Wenyuan Lin Qingdong Zheng State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences University of Chinese Academy of Sciences College of Chemistry Fuzhou University

nonfullerene acceptors are being investigated for use in polymer solar cells(PSCs),with their advantages of extending the absorption range,reducing the energy loss and therefore enhancing the power conversion efficiency(PCE).However,to further boost the PCE,mobilities of these nonfullerene acceptors should be *** nonfullerene acceptors,the π–π stacking distance between cofacially stacked molecules significantly affects their ***,we demonstrate a strategy to increase the mobility of heteroheptacene-based nonfullerene acceptors by reducing their π–π stacking distances via control over the bulkiness of lateral side *** of 2-butyloctyl substituents into the nonfullerene acceptor(M36) leads to an increased mobility with a reduced π–π stacking distance of 3.45 ?.Consequently,M36 affords an enhanced PCE of 16%,which is the highest among all acceptor-donor-acceptor-type nonfullerene acceptors to *** strategy of control over the bulkiness of side chains on nonfullerene acceptors should aid the development of more efficient PSCs.

关键词： polymer solar cell power conversion efficiency nonfullerene acceptor ladder‐type heteroheptacene π–π stacking charge carrier mobility

Asymmetric molecular engineering in recent nonfullerene acceptors for efficient organic solar cells

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Chinese Chemical Letters 2023年第10期34卷 48-54页

作者： Jinsheng Song Zhishan Bo Engineering Research Center for Nanomaterials Henan UniversityKaifeng 475004China Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China College of Textiles&Clothing Qingdao UniversityQingdao 266071China

nonfullerene acceptors(NFAs),which usually possess symmetric skeletons,have drawn great attention in recent years due to their pronounced advantages over the fullerene ***,breaking the symmetry of NFAs could fine tune the molecular dipole,solubility,energy level,intermolecular interaction,molecular packing,crystallinity,etc.,and give rise to improved photovoltaic ***,there are three main strategies for the design of asymmetric *** review highlights the recent advances of high-performance asymmetric NFAs and briefly outlooks the materials exploration for the future.

关键词： Asymmetric strategy Organic photovoltaics nonfullerene acceptor Side chain engineering Y-series acceptors

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Rationally pairing photoactive materials for high-performance polymer solar cells with efficiency of 16.53%

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Science China Chemistry 2020年第2期63卷 265-271页

作者： Yue Wu Yan Zheng Hang Yang Chenkai Sun Yingying Dong Chaohua Cui He Yan Yongfang Li Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China CAS Research/Education Center for Excellence in Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Department of Chemistry Energy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionHong Kong University of Science and TechnologyClear Water Bay KowloonHong KongChina

The emergence of non-fullerene acceptors(NFA) offers a promising opportunity to develop high-performance donor/acceptor pairs with high power conversion efficiency,as NFAs offer tunable energy levels,broad absorption and suitable aggregation *** order to enhance light-harvesting capability of active layers,we choose a wide bandgap polymer PTQ10 as the donor to blend with a narrow bandgap NFAY6 as the *** comparison with PTQ10:IDIC blend,~130 nm red-shifted absorption spectrum is observed in the PTQ10:Y6 blend,which potentially enhance the short-circuit current density(Jsc) for the *** addition,the optimal PTQ10:Y6 blend shows higher photoluminescence quenching efficiency and more efficient charge separation,higher charge mobilities,as well as weaker bimolecular recombination over the PTQ10:IDIC blend,which leads to an outstanding power conversion efficiency(PCE) of 16.53%,with a notable Jsc of 26.65 mA cm^-2 and fill factor(FF) of 0.751.

关键词： polymer solar cells polymer donor nonfullerene acceptor power conversion efficiency

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Alloy-like ternary polymer solar cells with over 17.2% efficiency

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Science Bulletin 2020年第7期65卷 538-545,M0003页

作者： Qiaoshi An Jian Wang Wei Gao Xiaoling Ma Zhenghao Hu Jinhua Gao Chunyu Xu Minghui Hao Xiaoli Zhang Chuluo Yang Fujun Zhang School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China College of Physics and Electronic Engineering Taishan UniversityTaian 271021China Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials Department of ChemistryWuhan UniversityWuhan 400072China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China School of Science Beijing Jiaotong UniversityBeijing 100044China

Ternary strategy has been considered as an efficient method to achieve high performance polymer solar cells(PSCs). A power conversion efficiency(PCE) of 17.22% is achieved in the optimized ternary PSCs with10 wt% MF1 in acceptors. The over 8% PCE improvement by employing ternary strategy is attributed to the simultaneously increased JSCof 25.68 mA cm^-2, VOCof 0.853 V and FF of 78.61% compared with Y6 based binary PSCs. The good compatibility of MF1 and Y6 can be confirmed from Raman mapping, contact angle,cyclic voltammetry and morphology, which is the prerequisite to form alloy-like state. Electron mobility in ternary active layers strongly depends on MF1 content in acceptors due to the different lowest unoccupied molecular orbital(LUMO) levels of Y6 and MF1, which can well explain the wave-like varied FF of ternary PSCs. The third-party certified PCE of 16.8% should be one of the highest values for single bulk heterojunction PSCs. This work provides sufficient references for selecting materials to achieve efficient ternary PSCs.

关键词： Polymer solar cells Ternary strategy nonfullerene acceptor Alloy-like model

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Enhancing photovoltaic performance via aggregation dynamics control in fused-ring electron acceptor

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Aggregate

Aggregate 2021年第3期2卷 1-8页

作者： Jiayu Wang Runyu Zhu Shijie Wang Yawen Li Boyu Jia Jiadong Zhou Peiyao Xue Susanne Seibt Yuze Lin Zengqi Xie Wei Ma Xiaowei Zhan Department of Materials Science and Engineering College of EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationPeking UniversityBeijingChina State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’anChina Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijingChina Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouChina Australian Synchrotron ClaytonVictoriaAustralia

A new fused-ring electron acceptor FNIC3 with dynamics controlled aggregation behavior was ***3 shows strong absorption in 600–900 nm,HOMO/LUMO energy levels of−5.59/−4.04 eV,and electron mobility of 1.2×10^(−3) cm^(2) V^(−1) s^(−1).The aggregation of FNIC3 shows strong dependency on film formation *** of film formation time promotes the crystallization of FNIC3,leading to improved crystallinity and enlarged aggregate *** of FNIC3 significantly influences the photovoltaic device *** aggregation red-shifts the absorption and improves the mobilities of the blend,which contributes to high photocurrent and fill factor thus high power conversion efficiency(PCE).Overaggregation leads to increased nonradiative energy loss and insufficient charge generation,resulting in decreased open-circuit voltage and short-circuit current *** blends based on PM6:FNIC3 fabricated under proper film formation time exhibit a PCE of 12.3%,higher than those fabricated under short and long film formation time(10.0–10.5%).

关键词： aggregation dynamics fused-ring electron acceptor nonfullerene acceptor organic solar cell

Design of All-Fused-Ring Electron acceptors with High Thermal,Chemical,and Photochemical Stability for Organic Photovoltaics

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CCS Chemistry 2021年第6期3卷 1070-1080页

作者： Xiaozhang Zhu Songjun Liu Qihui Yue Wuyue Liu Shaoming Sun Shengjie Xu Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of ChemistryChinese Academy of SciencesBeijing 100190 School of Chemical Sciences University of the Chinese Academy of SciencesBeijing 100190

High-performance donor-acceptor electron acceptors containing 2-(3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile(INCN)-type terminals are labile toward photooxidation and basic conditions,and new molecular designs toward electron acceptors that can achieve both high power conversion efficiencies and high stability are urgently *** replacing the central benzene ring in the classical ladder-type n-type semiconductor,2,2′-(indeno[1,2-b]fluorene-6,12-diylidene)dimalononitrile,with the electron-rich 4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene,we report herein the design of 2,2′-(7,7,15,15-tetrahexyl-7,15-dihydro-sindaceno[1,2-b:5,6-b′]diindeno[1,2-d]thiophene-2,10(2H)-diylidene)dimalononitrile(ITYM),a new type of all-fused-ring electron acceptor(AFRA).A threestep reaction including a key Pd-catalyzed double C-H activation/intramolecular cyclization is established for the efficient synthesis of such type of electron *** is confirmed by singlecrystal X-ray analysis,which shows a planar nonacyclic structure with strongπ-π*** with the classical carbon-bridged INCN-type acceptors,ITYM exhibits extraordinary stability with very promising *** AFRA concept opens a new avenue toward high-efficiency and-stability organic photovoltaics(OPVs).

关键词： organic photovoltaics nonfullerene acceptor all-fused-ring design C-H activation stability

Delicate Crystallinity Control Enables High-Efficiency P3HT Organic Photovoltaic Cells

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Delicate Crystallinity Control Enables High-Efficiency P3HT ...