Journal Article

FZJ-2023-01732

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A conformally bonded molecular interface retarded iodine migration for durable perovskite solar cells

Yuan, L. ; Zhu, W. ; Zhang, Y. ; Li, Y. (Corresponding author) ; Chan, C. C. S. ; Qin, M. ; Qiu, J. ; Zhang, K. ; Huang, J. ; Wang, J. ; Luo, H. ; Zhang, Z. ; Chen, R. ; Liang, W. ; Wei, Q. ; Wong, K. S. ; Lu, X. ; Li, N. (Corresponding author)FZJ* ; Brabec, C.FZJ* ; Ding, L. ; Yan, K. (Corresponding author)

2023
RSC Publ. Cambridge

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Please use a persistent id in citations: http://hdl.handle.net/2128/34319  doi:10.1039/D2EE03565K

Abstract: 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.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IEK-11)

Research Program(s):

1. 1213 - Cell Design and Development (POF4-121) (POF4-121)
2. 1212 - Materials and Interfaces (POF4-121) (POF4-121)

Appears in the scientific report 2023

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Agriculture, Biology and Environmental Sciences ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 30 ; JCR ; National-Konsortium ; SCOPUS ; Web of Science Core Collection

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