Nuclei position-control and crystal growth-guidance on frozen substrates for high-performance perovskite solar cells

Gang Wang; Liping Liao; Lianbin Niu; Lijia Chen; Wenjun Li; Cunyun Xu; Elisabeth Mbeng; Yanqing Yao; Debei Liu; Qunliang Song

doi:10.1039/c9nr02777g

Nuclei position-control and crystal growth-guidance on frozen substrates for high-performance perovskite solar cells

Nanoscale. 2019 Jul 7;11(25):12108-12115. doi: 10.1039/c9nr02777g. Epub 2019 Jun 5.

Authors

Affiliations

¹ Institute for Clean Energy and Advanced Materials, School of Materials and Energy, Southwest University, Chongqing 400715, P. R. China. qlsong@swu.edu.cn and Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy, Chongqing 400715, P. R. China.
² College of Physics and Electronics Engineering, Chongqing Normal University, Chongqing 401331, P. R. China.
³ Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy, Chongqing 400715, P. R. China.

PMID: 31165840
DOI: 10.1039/c9nr02777g

Abstract

Nucleation and crystal growth are key stages for high-quality perovskite films that dominate the performance of perovskite solar cells. However, the position of nuclei in the films and the orientation of the crystal growth have not yet been intendedly controlled during their fabrication. In this study, we developed a method of spin-coating perovskite films on frozen substrates to control the position of the nuclei and the direction of the crystal growth at the same time. In this way, the position of the crystal nuclei and the growth orientation of the perovskite crystals in the perovskite films can be simultaneously controlled. A high-quality perovskite film with grains spanning vertically the entire film thickness has been obtained using this new method. And an efficient inverted planar solar cell (ITO/PEDOT:PSS/CH₃NH₃PbI₃/PC61BM/BCP/Ag) with the highest power conversion efficiency of 17.14% and open-circuit voltage of 1.14 V has been achieved by using this technique.