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Journal of Energy Chemistry 2022年第7期31卷 67-73,I0003页

作者： Longzhu Liu Hanjian Lai Feng He School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and TechnologyShenzhen 518055GuangdongChina Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055GuangdongChina

ternary strategy is a convenient and effective method to boost the performance of polymer solar cells(PSCs).Utilizing a ternary strategy to trade-off between the energy loss and the efficiency of devices however requires further ***,through the hydroxyl(-OH)and acetoxy(-OCOMe)substitution atβ-position of the IC terminal group,we developed two new synthetic acceptors,BTIC-OH-βand BTICOCOMe-β,which were designed to confine the morphology *** of an analogue as the third component provides a simple but efficient way to further balance the short current density(Jsc)and open-circuit voltage(Voc),leading to a champion efficiency based on PBDB-T:PBDB-TF:BTIC-OCOMe-β,effectively as high as 12.45%.The results were examined mainly in terms of the morphology characterization,electroluminescence external quantum efficiency(EQEEL),steady-state photoluminescence(PL)and transient *** suggested fine-tuning of the morphology by ratio modulation,reduction of the energy loss,construction of a promising pathway for charge transfer in the ternary system and enhancing the carrier *** this way,a ternary strategy with an analogue donor could provide more routes to higher-quality solar cells.

关键词： Polymer solar cell ternary strategy Energy loss Trade-off

Suppressing trap states and energy loss by optimizing vertical phase distribution through ternary strategy in organic solar cells

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Science China Chemistry 2021年第4期64卷 599-607页

作者： Pengqing Bi Shaoqing Zhang Tong Xiao Minghuan Cui Zhihao Chen Junzhen Ren Chaochao Qin Guanghao Lu Xiaotao Hao Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Crystal Materials School of PhysicsShandong UniversityJinan 250100China School of Chemistry and Biology Engineering University of Science and Technology BeijingBeijing 100083China Frontier Institute of Science and Technology State Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710054China Department of Physics Henan Normal UniversityXinxiang 453007China

Suppressing the trap-state density and the energy loss via ternary strategy was *** vertical phase distribution with donors(acceptors)accumulated(depleted)at the interface of active layer and charge extraction layer can be obtained by introducing appropriate amount of polymer acceptor N2200 into the systems of PBDB-T:IT-M and PBDB-TF:*** addition,N2200 is gradiently distributed in the vertical direction in the ternary blend *** measurements were carried out to study the effects of N2200 on the binary *** was found that the optimized morphology especially in vertical direction can significantly decrease the trap state density of the binary blend films,which is beneficial for the charge transport and *** these features enable an obvious decrease in charge recombination in both PBDB-T:IT-M and PBDB-TF:Y6 based organic solar cells(OSCs),and power conversion efficiencies(PCEs)of 12.5%and 16.42%were obtained for the ternary OSCs,*** work indicates that it is an effective method to suppress the trap state density and thus improve the device performance through ternary strategy.

关键词： non-fullerene organic solar cells ternary strategy vertical phase distribution trap state density energy loss

Enhancing photostability and power conversion efficiency of organic solar cells by a “sunscreen” ternary strategy

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Science China Chemistry 2023年第4期66卷 1179-1189页

作者： Yongjie Cui Zeng Chen Peipei Zhu Wei Ma Haiming Zhu Xunfan Liao Yiwang Chen State Key Laboratory for Modification of Chemical Fibers and Polymer Materials&College of Materials Science and Engineering Donghua UniversityShanghai 201620China National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang 330022China Center for Chemistry of High-Performance and Novel Materials Department of ChemistryZhejiang UniversityHangzhou 310027China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China

The field has witnessed the rapid growth in the power conversion efficiency(PCE)of organic solar cells(OSCs)over the past decade,reaching the threshold for practical ***,a major issue remains that OSC lifetimes are seriously limited by the ultraviolet(UV)-induced ***,inspired by the superior photostability of car paint under sunlight and ambient air,a“sunscreen”molecule,2-(2-hydroxy-5-tert-octylphenyl)benzotriazole(UV329),is used to construct the PM6:Y6 ternary *** addition of UV329 mainly enhances the ordered stacking of PM6 and increases the light utilization of blend films with the improved crystallization and appropriate phase ***,the ternary device exhibits stronger light response and obviously higher and more balanced carrier mobilities,contributing to higher short-circuit current density,fill factor and *** PCE boost is also verified in PM6:BTP-e C9 and PM6:L8-BO *** photodegradation of PM6 dominates the photo-degradation process of PM6:Y6 systems,while the UV329 can effectively suppress such degradation,and thus the ternary device can retain nearly 90%of the initial PCE under continuous illumination for 120 ***,ternary devices also preserve better thermal stability and shelf-life with the enhanced *** work provides a simple yet effective strategy for simultaneously improving PCE and photostability of OSCs.

关键词： ternary strategy sunscreen UV absorber photostability organic solar cells

ternary strategy for high-efficiency nonfullerene organic solar cells

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Ternary strategy for high-efficiency nonfullerene organic so...

19.3% Efficiency ternary organic solar cells enabled by the alkyl side-chain effect of guest non-fullerene acceptors

第八届新型太阳能材料科学与技术学术研讨会

作者： Shaohua Xie Kun Li Hongbing Fu Department of Chemistry Capital Normal University

In recent years, non-fullerene electron acceptors(NFAs) have gained widespread attention in the field of organic photovoltaics. At present, the efficiency of bulk heterojunctions(BHJs) organic solar cells based on non-fullerene electron acceptors has exceeded 18%. In order to overcome some of the limitations of the binary system, the high-efficiency ternary strategy has wide applicability in improving the performance of solar cell devices. We introduced IDIC as the third component in PM6:Y6 and PM6:IT-4 F to construct ternary organic solar cells. The HOMO and LUMO energy levels of IDIC are between PM6, Y6 and IT-4 F, which can form a better cascade energy level, which is conducive to carrier transmission;and IDIC itself has strong crystallinity, so it is appropriate. The introduction of IDIC can well adjust the morphology of the active layer, facilitate the dissociation of excitons, and further improve device performance. The PCE of the ternary system has increased from 12.88% of the binary system to 14.03% and 15.45% to 16.51%. Therefore, the ternary strategy has certain applicability in the field of organic photovoltaics.

关键词： ternary strategy Non-fullerene acceptors Organic solar cells

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Science China Chemistry 2024年第8期67卷 2686-2693页

作者： Hongqian Wang Sijian Wu Daobin Yang Xueliang Yu Shuncheng Yang Pengfei Ding Pengyu Yan Zaifei Ma Jianfeng Zhang Ziyi Ge School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China Zhejiang Engineering Research Center for Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The effect of side-chain engineering of conjugated molecules on the morphology and device performance in binary organic solar cells has been widely investigated. However, this relationship has hardly been studied in the guest components of ternary organic solar cells. In this study, a family of non-fullerene guest acceptors, namely XY-3, XY-5 and XY-7, with hydrogen substituent,straight and branched alkyl chains on the bithiophene units, respectively, were designed and synthesized to understand their effects on aggregation properties and device performance. The straight and branched alkyl chains on the bithiophene units result in sightly blue-shifted absorption compared to the hydrogen substituent and the XY-7 demonstrates the most appropriate phase separation scale and the most balanced charge transport. Consequently, the OSCs based on D18:e C9:XY-7 achieve a high shortcircuit current density(JSC) and fill factor(FF), while maintaining the enhancement of the open-circuit voltage(VOC) achieving an efficiency of 19.32%, exceeding those of D18:e C9, D18:e C9:XY-3, D18:e C9:XY-5(PCE:18.28%, 19.04%, 18.75%, respectively). These results highlight that the side-chain engineering of Y series non-fullerene acceptors as the guest acceptors has great potential in optimizing morphology properties and promoting photovoltaic performance.

关键词： organic solar cells side chain engineering ternary strategy non-fullerene energy losses

Approaching 18% efficiency of ternary organic photovoltaics with wide bandgap polymer donor and well compatible Y6 : Y6-1O as acceptor

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National Science Review 2021年第8期8卷 20-29页

作者： Xiaoling Ma Anping Zeng Jinhua Gao Zhenghao Hu Chunyu Xu Jae Hoon Son Sang Young Jeong Caixia Zhang Mengyang Li Kai Wang He Yan Zaifei Ma Yongsheng Wang Han Young Woo Fujun Zhang Key Laboratory of Luminescence and Optical Information Ministry of EducationBeijing Jiaotong University Organic Optoelectronic Materials Laboratory Department of ChemistryCollege of ScienceKorea University Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology Department of Chemistry The Hong Kong University of Science and Technology Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua University

A series of ternary organic photovoltaics(OPVs) are fabricated with one wide bandgap polymer D18-Cl as donor, and well compatible Y6 and Y6-1O as acceptor. The open-circuit-voltage(V)of ternary OPVs is monotonously increased along with the incorporation of Y6-1O, indicating that the alloy state should be formed between Y6 and Y6-1O due to their excellent compatibility. The energy loss can be minimized by incorporating Y6-1 O, leading to the VOC improvement of ternary OPVs. By finely adjusting the Y6-1O content, a power conversion efficiency of 17.91% is achieved in the optimal ternary OPVs with 30 wt% Y6-1O in acceptors, resulting from synchronously improved short-circuit-current density(JSC) of 25.87 mA cm, fill factor(FF) of 76.92% and VOC of 0.900 V in comparison with those of D18-Cl : Y6 binary OPVs. The JSC and FF improvement of ternary OPVs should be ascribed to comprehensively optimal photon harvesting, exciton dissociation and charge transport in ternary active layers. The more efficient charge separation and transport process in ternary active layers can be confirmed by the magnetophotocurrent and impedance spectroscopy experimental results, respectively. This work provides new insight into constructing highly efficient ternary OPVs with well compatible Y6 and its derivative as acceptor.

关键词： organic photovoltaics power conversion efficiency ternary strategy photon harvesting morphology regulation

Tandem organic solar cells with 20.6% efficiency enabled by reduced voltage losses

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National Science Review 2023年第6期10卷 215-225页

作者： Jianqiu Wang Zhong Zheng Pengqing Bi Zhihao Chen Yafei Wang Xiaoyu Liu Shaoqing Zhang Xiaotao Hao Maojie Zhang Yongfang Li Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductoroptoelectronics Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University School of Chemistry and Biology Engineering University of Science and Technology Beijing School of Physics State Key Laboratory of Crystal Materials Shandong University University of Chinese Academy of Sciences CAS Key Laboratory of Organic Solids Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences

Large voltage losses are the main obstacle for achieving high efficiency in organic solar cells(OSCs).Here we construct ternary OSCs by introducing an asymmetric small molecule acceptor AITC into PBDB-TCl:BTP-eC9 system and demonstrate the effectiveness in simultaneously decreasing energy disorder and non-radiative voltage *** is found that the introduction of AITC can modify domain size and increase the degree of crystallinity,which enhances open-circuit voltage and power conversion efficiency(19.1%,certified as 18.9%).Inspiringly,an output efficiency of 20.6% of the constructed tandem OSCs based on PBDB-TCl:AITC:BTP-eC9 ternary active layer output a recorded efficiency of 20.6%(certified as 20.3%),which is the highest value in OSCs field to *** work demonstrates that decreasing the voltage losses by ternary strategy and constructing of tandem architecture are effective approaches towards improving photovoltaic performance.

关键词： organic solar cells power conversion efficiency voltage losses tandem cells ternary strategy

14.46% Efficiency small molecule organic photovoltaics enabled by the well trade-off between phase separation and photon harvesting

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Journal of Energy Chemistry 2021年第6期30卷 610-617,I0015页

作者： Chunyu Xu Haiyan Chen Zijin Zhao Jinhua Gao Xiaoling Ma Shirong Lu Xiaoli Zhang Zeyun Xiao Fujun Zhang Key Laboratory of Luminescence and Optical Information Ministry of EducationBeijing Jiaotong UniversityBeijing 100044China Organic Semiconductor Research Center Chongqing Institute of Green and Intelligent TechnologyChongqing SchoolUniversity of Chinese Academy of Sciences(UCAS Chongqing)Chinese Academy of SciencesChongqing 400714China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina

Small molecule organic photovoltaics(SMPVs) were prepared by utilizing liquid crystalline donor material BTR-Cl and two similar optical bandgap non-fullerene acceptor materials BTP-BO-4 F and *** BTPBO-4 F and Y6 have the similar optical bandgap and different absorption *** corresponding binary SMPVs exhibit different short circuit current density(/sc)(20.38 vs.23.24 mA cm^(-2)),and fill factor(FF)(70.77% vs.67.21%).A 14.46% power conversion efficiency(PCE) is acquired in ternary SMPVs with 30 wt% Y6,companied with a JSC of 24.17 mA cm^(-2) a FF of 68.78% and an open circuit voltage(Voc) of 0.87 *** improvement on PCE of ternary SMPVs should originate from the well trade-off between phase separation and photon harvesting of ternary active layers by incorporating 30 wt% Y6 in *** work may deliver insight onto the improved performance of SMPVs by superposing the superiorities of binary SMPVs with similar optical bandgap acceptors into one ternary cell.

关键词： Small molecule organic photovoltaics ternary strategy Non-fullerene acceptor

Inner alkyl chain modulation of small molecular acceptors enables molecular packing optimization and efficient organic solar cells

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Science China Chemistry 2023年第2期66卷 500-507页

作者： Yuntong Guo Zhenyu Chen Jinfeng Ge Jinna Zhang Lin Xie Ruixiang Peng Wei Ma Ziyi Ge Zhejiang Engineering Research Center for Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China School of Chemical Engineering Zhejiang University of TechnologyHangzhou310014China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China

With the generation of Y6,organic solar cells have reached remarkable achievement of over 19%*** chain is of importance to modulate intermolecular stacking and possibly enhance optoelectronic properties of small molecule acceptors(SMAs).Three alkyl chains of 2-ethylhexyl,2-butylocyl and 3-ethylheptyl were selected to obtain G6-EH,G6-BO and G6-EHep molecules,*** to G6-EH and G6-BO,G6-EHep was found inducing unfavourable large domain ***,we discover that 2-butyloctyl effectively inhibits monomolecular and bimolecular recombination,improves molecular packing,generates more balanced carrier mobility and enhances exciton *** SMA with 2-butyloctyl alkyl chains(G6-BO)shows the best electrical and morphological characteristics,achieving a higher power conversion efficiency(PCE)of 17.06%,with an open circuit voltage of 0.912 V,a short-circuit current of 24.22 m A cm-2and a fill factor of 77.25%.Finally,using the ternary strategy by incorporating the G6-BO acceptor into PM6:BTP-e C9,we achieved a higher PCE of18.13%with enhanced electron transport.

关键词： alkyl chain small molecular acceptors molecular packing ternary strategy

Over 16.7% efficiency of ternary organic photovoltaics by employing extra PC71BM as morphology regulator

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Science China Chemistry 2020年第1期63卷 83-91页

作者： Jinhua Gao Jian Wang Qiaoshi An Xiaoling Ma Zhenghao Hu Chunyu Xu Xiaoli Zhang Fujun Zhang Key Laboratory of Luminescence and Optical Information Ministry of EducationBeijing Jiaotong UniversityBeijing 100044China College of Physics and Electronic Engineering Taishan UniversityTaian 271021China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

ternary organic photovoltaics(OPVs)are fabricated with PBDB-T-2 Cl:Y6(1:1.2,wt/wt)as the host system and extra PC71BM as the third *** PBDB-T-2 Cl:Y6 based binary OPVs exhibit a power conversion efficiency(PCE)of 15.49%with a short circuit current(JSC)of 24.98 mA cm^-2,an open circuit voltage(VOC)of 0.868 V and a fill factor(FF)of 71.42%.A 16.71%PCE is obtained in the optimized ternary OPVs with PBDB-T-2 Cl:Y6:PC71BM(1:1.2:0.2,wt/wt)active layer,resulting from the synchronously improved JSC of 25.44 mA cm^-2,FF of 75.66%and the constant VOCof 0.868 *** incorporated PC71BM may prefer to mix with Y6 to finely adjust phase separation,domain size and molecular arrangement in ternary active layers,which can be confirmed from the characterization on morphology,2 D grazing incidence small and wide-angle X-ray scattering,as well as Raman *** addition,PC71BM may prefer to mix with Y6 to form efficient electron transport channels,which should be conducive to charge transport and collection in the optimized ternary *** work provides more insight into the underlying reasons of the third component on performance improvement of ternary OPVs,indicating ternary strategy should be an efficient method to optimize active layers for synchronously improving photon harvesting,exciton dissociation and charge transport,while keeping the simple cell fabrication technology.

关键词： ternary strategy organic photovoltaics morphology regulator power conversion efficiency organic solar cells