TY  - JOUR
AU  - Li, Guixiang
AU  - Su, Zhenhuang
AU  - Li, Meng
AU  - Yang, Feng
AU  - Aldamasy, Mahmoud H.
AU  - Pascual, Jorge
AU  - Yang, Fengjiu
AU  - Liu, Hairui
AU  - Zuo, Weiwei
AU  - Di Girolamo, Diego
AU  - Iqbal, Zafar
AU  - Nasti, Giuseppe
AU  - Dallmann, André
AU  - Gao, Xingyu
AU  - Wang, Zhaokui
AU  - Saliba, Michael
AU  - Abate, Antonio
TI  - Ionic Liquid Stabilizing High‐Efficiency Tin Halide Perovskite Solar Cells
JO  - Advanced energy materials
VL  - 11
IS  - 32
SN  - 1614-6832
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2021-05675
SP  - 2101539 -
PY  - 2021
AB  - Tin halide perovskites attract incremental attention to deliver lead-free perovskite solar cells. Nevertheless, disordered crystal growth and low defect formation energy, related to Sn(II) oxidation to Sn(IV), limit the efficiency and stability of solar cells. Engineering the processing from perovskite precursor solution preparation to film crystallization is crucial to tackle these issues and enable the full photovoltaic potential of tin halide perovskites. Herein, the ionic liquid n-butylammonium acetate (BAAc) is used to tune the tin coordination with specific O…Sn chelating bonds and NH…X hydrogen bonds. The coordination between BAAc and tin enables modulation of the crystallization of the perovskite in a thin film. The resulting BAAc-containing perovskite films are more compact and have a preferential crystal orientation. Moreover, a lower amount of Sn(IV) and related chemical defects are found for the BAAc-containing perovskites. Tin halide perovskite solar cells processed with BAAc show a power conversion efficiency of over 10%. This value is retained after storing the devices for over 1000 h in nitrogen. This work paves the way toward a more controlled tin-based perovskite crystallization for stable and efficient lead-free perovskite photovoltaics.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000669023800001
DO  - DOI:10.1002/aenm.202101539
UR  - https://juser.fz-juelich.de/record/904105
ER  -