In:
Angewandte Chemie, Wiley, Vol. 135, No. 33 ( 2023-08-14)
Abstract:
The classic solvent system can't sufficiently separate one‐dimensional edge‐sharing SnI 2 crystals in solution, which severely restricts the fabrication of high‐quality tin‐based perovskite film. Herein, a strong Lewis base (hexamethylphosphoramide, HMPA) has been introduced to coordinate Sn 2+ to modulate solvation behaviours on perovskite precursor and regulate crystallization kinetics. The large molecular volume of HMPA and stronger bind energy of SnI 2 ⋅ 2HMPA (−0.595 eV vs −0.118 eV for SnI 2 ⋅ 2DMSO) change the solvation structure of SnI 2 from edge‐sharing cluster to monodisperse adduct, which contributes to uniform nucleation sites and prolongs crystal growth process. Delightfully, a fully‐covered perovskite film is formed on the large‐area substrate and tin‐based perovskite solar cells processed with HMPA exhibit an excellent efficiency of 13.46 %. This research provides novel insights and directions for the solution preparation of smooth and uniform large‐area tin‐based perovskite film.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v135.33
DOI:
10.1002/ange.202306712
Language:
English
Publisher:
Wiley
Publication Date:
2023
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