TY  - JOUR
AU  - Yuan, Ligang
AU  - Zhu, Weiya
AU  - Zhang, Yiheng
AU  - Li, Yuan
AU  - Chan, Christopher C. S.
AU  - Qin, Minchao
AU  - Qiu, Jianhang
AU  - Zhang, Kaicheng
AU  - Huang, Jiaxing
AU  - Wang, Jiarong
AU  - Luo, Huiming
AU  - Zhang, Zheng
AU  - Chen, Ruipeng
AU  - Liang, Weixuan
AU  - Wei, Qi
AU  - Wong, Kam Sing
AU  - Lu, Xinhui
AU  - Li, Ning
AU  - Brabec, Christoph
AU  - Ding, Liming
AU  - Yan, Keyou
TI  - A conformally bonded molecular interface retarded iodine migration for durable perovskite solar cells
JO  - Energy & environmental science
VL  - 16
IS  - 3
SN  - 1754-5692
CY  - Cambridge
PB  - RSC Publ.
M1  - FZJ-2023-01732
SP  - 1597-1609 
PY  - 2023
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000941368100001
DO  - DOI:10.1039/D2EE03565K
UR  - https://juser.fz-juelich.de/record/1006591
ER  -