Effect of Ge Incorporation on Lead‐free Cs‐based Triiodide Sn−Ge Co‐alloy Perovskite Thin Films by Spin Coating

Author:

Li Hongyu1,Ye Chao1,Yang Jianming1,Jiang Yu2,Wu Zhifang1,Donaev Sardor Burkhanovich3,Wang Shenghao1ORCID

Affiliation:

1. Materials Genome Institute Shanghai University Shangda Rd. 99 200444 Shanghai China

2. Chengdu Product Quality Supervision Inspection and Research Institute Xingmao Str. 16 610100 Chengdu China

3. Faculty of Electronics and Automation Tashkent State Technical University University Str. 2 100095 Tashkent Uzbekistan

Abstract

AbstractA new Sn−Ge co‐alloy perovskite that does not contain toxic Pb is attracting attention due to its excellent predicted optoelectronic properties. However, most current research only focuses on compositions with Ge content up to 50 %, resulting in a limited overall understanding on this material system. In this study, CsSn1–xGexI3 (0≤x≤1) perovskite thin films were fabricated using spin coating method and characterized in terms of crystallographic, morphological and optical characteristics systematically. The results show that the Ge incorporation causes lattice shrinkage and a change in the crystallographic phase from orthorhombic to trigonal. Additionally, the coverage varies much as Ge increases. The Ge incorporation also results in a blueshift of the photoluminescence peak and a decrease in luminescence intensity as compared to the composition with lower Ge content. Moreover, the carrier dynamics measurement shows that the Ge incorporation increases the carrier nonradiative recombination. This work provides important hints for the development of the Sn−Ge alloy‐based perovskite solar cell.

Funder

Songshan Lake Materials Laboratory

National Natural Science Foundation of China

Publisher

Wiley

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