In-situ understanding on the formation of fibrillar morphology in green solvent processed all-polymer solar cells  

作　　者：Ruijie Ma Hongxiang Li Top Archie Dela Peña Heng Wang Cenqi Yan Pei Cheng Jiaying Wu Gang Li 

机构地区：[1]Department of Electrical and Electronic Engineering,Research Institute for Smart Energy(RISE),Photonic Research Institute(PRI),The Hong Kong Polytechnic University,Hong Kong 999077,China [2]College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610040,China [3]Function Hub,Advanced Materials Thrust,The Hong Kong University of Science and Technology,Guangzhou 511400,China

出　　处：《National Science Review》2024年第12期238-247,共10页国家科学评论(英文版)

基　　金：G.Li and R.Ma thank the support from PolyU Distinguished Postdoc Fellowship(1-YW4C);P.Cheng thanks the support by the Sichuan Science and Technology Program(2023YFH0087,2023YFH0085,2023YFH0086 and 2023NSFSC0990);the State Key Laboratory of Polymer Materials Engineering(sklpme2022-3-02 and sklpme2023-2-11);the Xizang Foreign Experts Program(2022wz002);J.Wu thanks the Guangdong government and the Guangzhou government for funding(2021QN02C110);the Guangzhou Municipal Science and Technology Project(2023A03J0097 and 2023A03J0003);the National Natural Science Foundation of China(52303249);G.Li acknowledges Research Grants Council of Hong Kong(15221320,15307922,C5037-18 G,C4005-22Y and C7018-20 G);the RGC Senior Research Fellowship Scheme(SRFS2223-5S01);the Shenzhen Science and Technology Innovation Commission(JCYJ20200109105003940);the Hong Kong Polytechnic University:Sir Sze-yuen Chung Endowed Professorship Fund(8-8480);RISE(Q-CDBK),PRI(Q-CD7X);the Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal Electrical Energy Materials and Devices(GDSTC No.2019B121205001).

摘　　要：Solid additive engineering has been intensively explored on morphology tuning for highly efficient all-polymer solar cells(all-PSCs),a promising photovoltaic technology towards multi-scenario application.Although the nano-fibri l lar network of the active layer induced by additive treatment is confirmed as the key factor for power conversion efficiency(PCE)of all-PSCs,its formation mechanism is not clearly revealed,for lack of precise and convincing real-time observation of crystallization and phase separation during the liquid-to-solid transition process of spin-coating.Herein we report an in-situ grazing incidence wide-angle/small-angle X-ray scattering(GIWAXS/GISAXS)screening that reveals the fact that naphthalene derived solid additives can suppress the aggregation of the polymer acceptor(PY-IT)at the beginning stage of spin coating,which provides sufficient time and space for the polymer donor(PM6)to form the fibril structure.Moreover,guided by this knowledge,a ternary all-polymer system is proposed,which achieves cutting-edge level PCEs for both small-area(0.04 cm2)(also decent operational stability)and large-area(1 cm2)devices.

关 键 词：all-polymer solar cells in-situ morphology screening naphthalene-based solid additives phase segregation 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]