Journal Article

PUBDB-2023-07794

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Multifunctional Buried Interface Modification Enables Efficient Tin Perovskite Solar Cells

Chen, Y. ; Qi, H. ; Wang, K. (Corresponding author)Extern* ; Kang, Z. ; Pan, G.Extern* ; Everett, C. R.Extern* ; Müller-Buschbaum, P.Extern* ; Tong, Y. (Corresponding author) ; Wang, H. (Corresponding author)

2023
WILEY-VCH Verlag GmbH & Co. KGaA Weinheim

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Please use a persistent id in citations: doi:10.1002/smtd.202300029

Abstract: Tin perovskite solar cells (PSCs) are considered promising candidates to promote lead-free perovskite photovoltaics. However, their power conversion efficiency (PCE) is limited by the easy oxidation of Sn$^{2+}$ and low quality of tin perovskite film. Herein, an ultra-thin 1-carboxymethyl-3-methylimidazolium chloride (ImAcCl) layer is used to modify the buried interface in tin PSCs, which can induce multifunctional improvements and remarkably enhance the PCE. The carboxylate group (C-O) and the hydrogen bond donor (N-H) in ImAcCl can interact with tin perovskites, thus significantly suppressing the oxidation of Sn$^{2+}$ and reducing the trap density in perovskite films. The interfacial roughness is reduced, which contributes to a high-quality tin perovskite film with increased crystallinity and compactness. In addition, the buried interface modification can modulate the crystal dimensionality, favoring the formation of large bulk-like crystals instead of low-dimensional ones in tin perovskite films. Therefore, the charge carrier transport is effectively promoted and the charge carrier recombination is suppressed. Eventually, tin PSCs show a remarkably enhanced PCE from 10.12% to 12.08%. This work highlights the importance of buried interface engineering and provides an effective way to realize efficient tin PSCs.

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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 2023

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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