Open AccessOptoelectronic properties improvement of double perovskites Cs 2 Sn(Pb)I 6 by the hydrothermal method
Author(s) -
Wu Junsheng,
Zhao Zhuo,
Li Tong,
Zhang Kaice,
Fang Fang,
Zhou Yanwen
Publication year - 2021
Publication title -
nano select
Language(s) - English
Resource type - Journals
ISSN - 2688-4011
DOI - 10.1002/nano.202000276
Subject(s) - photocurrent , hydrothermal circulation , doping , materials science , thermal stability , ion , photoelectric effect , grain size , hydrothermal synthesis , chemical engineering , nanotechnology , mineralogy , optoelectronics , chemistry , metallurgy , organic chemistry , engineering
Herein, we report on the synthesis of perovskite Cs 2 Sn(Pb)I 6 powder via a modified hydrothermal method, in which Pb 2+ ions are introduced to Cs 2 SnI 6 to optimize the semiconductor properties of double perovskite. Results indicate that the introduction of 2 at% Pb 2+ into the Cs 2 SnI 6 not only facilitates fine thermal stability, smoother surface with small grain size, expanding the scope of absorption. Thence the photovoltaic properties of Cs 2 SnI 6 are improved where obtained a higher photocurrent density (∼ 70 µA cm −2 ). Combined with changes in photoelectric properties, perhaps a small amount of Pb doping plays a role in reducing the formation energy and surface energy of the compounds. On the contrary, excessive Pb doping destroys the synthesis of Cs 2 SnI 6 and reduces the purity of the compound; thus, affecting its application. This study provides useful insights into the development of double perovskites with high stability and efficiency.