Journal Article

PUBDB-2024-00361

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png In Situ Surface Reconstruction toward Planar Heterojunction for Efficient and Stable FAPbI$_3$ Quantum Dot Solar Cells

Li, M. ; Bao, Y. ; Hui, W. ; Sun, K.Extern* ; Gu, L. ; Kang, X. ; Wang, D. ; Wang, B. ; Deng, H. ; Guo, R. ; Li, Z. ; Jiang, X. ; Mueller-Buschbaum, P. (Corresponding author)Extern* ; Song, L. (Corresponding author)Extern* ; Huang, W. (Corresponding author)

2024
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/adma.202309890

Abstract: Pure-phase α-FAPbI$_3$ quantum dots (QDs) are the focus of an increasing interest in photovoltaics due to their superior ambient stability, large absorption coefficient, and long charge-carrier lifetime. However, the trap states induced by the ligand-exchange process limit the photovoltaic performances. Here, a simple post treatment using methylamine thiocyanate is developed to reconstruct the FAPbI$_3$-QD film surface, in which a MAPbI$_3$ capping layer with a thickness of 6.2 nm is formed on the film top. This planar perovskite heterojunction leads to a reduced density of trap-states, a decreased band gap, and a facilitated charge carrier transport. As a result, a record high power conversion efficiency (PCE) of 16.23% with negligible hysteresis is achieved for the FAPbI$_3$ QD solar cell, and it retains over 90% of the initial PCE after being stored in ambient environment for 1000 h.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. DFG project 390776260 - EXC 2089: e-conversion (390776260) (390776260)

Experiment(s):

1. PETRA Beamline P03 (PETRA III)

Appears in the scientific report 2024

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; IF >= 25 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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