Post‐Annealing Treatment on Hydrothermally Grown Antimony Sulfoselenide Thin Films for Efficient Solar Cells
Suman Rijal, Alisha Adhikari, Rasha A. Awni, Chuanxiao Xiao, Deng‐Bing Li, Briana Dokken, Anna Ellingson, Ernesto Flores García, Sandip S. Bista, Dipendra Pokhrel, Sabin Neupane, R. E. Irving, Adam B. Phillips, Katherine Jungjohann, Chun-Sheng Jiang, Mowafak Al‐Jassim, Randy J. Ellingson, Zhaoning Song, Yanfa Yan
Abstract
Herein, antimony sulfoselenide (Sb 2 (S, Se) 3 ) thin‐film solar cells are fabricated by a hydrothermal method followed by a post‐deposition annealing process at different temperatures and the impact of the annealing temperature on the morphological, structural, optoelectronic, and defect properties of the hydrothermally grown Sb 2 (S, Se) 3 films is investigated. It is found that a proper annealing temperature leads to high‐quality Sb 2 (S, Se) 3 films with large crystal grains, high crystallinity, preferred crystal orientation, smooth and uniform morphology, and reduced defect density. These results show that suppressing deep‐level defects is crucial to enhance solar cell performance. After optimizing the annealing process, Sb 2 (S, Se) 3 solar cells with an improved power conversion efficiency 2.04 to 8.48% are obtained.