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Lead‐free Perovskite Materials (NH 4 ) 3 Sb 2 I x Br 9− x
Author(s) -
Zuo Chuantian,
Ding Liming
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201702265
Subject(s) - perovskite (structure) , electron mobility , analytical chemistry (journal) , solubility , absorption (acoustics) , materials science , energy conversion efficiency , crystallography , chemistry , optoelectronics , organic chemistry , composite material
A family of perovskite light absorbers (NH 4 ) 3 Sb 2 I x Br 9− x (0≤ x ≤9) was prepared. These materials show good solubility in ethanol, a low‐cost, hypotoxic, and environmentally friendly solvent. The light absorption of (NH 4 ) 3 Sb 2 I x Br 9− x films can be tuned by adjusting I and Br content. The absorption onset for (NH 4 ) 3 Sb 2 I x Br 9− x films changes from 558 nm to 453 nm as x changes from 9 to 0. (NH 4 ) 3 Sb 2 I 9 single crystals were prepared, exhibiting a hole mobility of 4.8 cm 2 V −1 s −1 and an electron mobility of 12.3 cm 2 V −1 s −1 . (NH 4 ) 3 Sb 2 I 9 solar cells gave an open‐circuit voltage of 1.03 V and a power conversion efficiency of 0.51 %.