%0 Journal Article
%A Yuan, Ligang
%A Zhu, Weiya
%A Zhang, Yiheng
%A Li, Yuan
%A Chan, Christopher C. S.
%A Qin, Minchao
%A Qiu, Jianhang
%A Zhang, Kaicheng
%A Huang, Jiaxing
%A Wang, Jiarong
%A Luo, Huiming
%A Zhang, Zheng
%A Chen, Ruipeng
%A Liang, Weixuan
%A Wei, Qi
%A Wong, Kam Sing
%A Lu, Xinhui
%A Li, Ning
%A Brabec, Christoph
%A Ding, Liming
%A Yan, Keyou
%T A conformally bonded molecular interface retarded iodine migration for durable perovskite solar cells
%J Energy & environmental science
%V 16
%N 3
%@ 1754-5692
%C Cambridge
%I RSC Publ.
%M FZJ-2023-01732
%P 1597-1609 
%D 2023
%X State-of-the-art n–i–p perovskite solar cells (PSCs) suffer from stability issues due to ionic interdiffusion. Herein, by enlarging the indacenodithiophene π-bridge donor (D′) to combine with the methoxy triphenylamine donor (D) and benzothiadiazole acceptor (A), three linear molecules termed L1, L2 and L3 with a D–A–D′–A–D structure are developed as dopant-free hole transport materials (HTMs). The π-bridge extension with active sites for coordination leverages the intramolecular dipole effect and intermolecular packing effect, resulting in a conformally bonded ultrathin interface with compact and uniform coverage (∼60 nm) to retard iodine migration and protect the buried perovskite. The unencapsulated L3-PSC (ITO/SnO2/perovskite/L3/MoO3/Au) achieved an impressive PCE of 22.61% (certified 21.79%, 0.0525 cm2). Ultrafast laser spectroscopy reveals that L-series molecules have a sequential reduction of photoexcited energy disorder to illustrate the structure–performance–stability relationship. L3-PSC maintains over 85% of the initial efficiency after 500 h at 85 °C maximum power point tracking (MPP) and enables the possibility of using small molecules to stabilize n–i–p PSCs.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000941368100001
%R 10.1039/D2EE03565K
%U https://juser.fz-juelich.de/record/1006591