Affiliation:
1. Department of Electronic Engineering College of Information Science and Technology Jinan University Guangzhou 510632 China
2. Institute of New Energy Technology College of Physics & Optoelectronic Engineering Jinan University Guangzhou 510632 China
3. Institute of Applied Physics and Materials Engineering University of Macau Macao Macao SAR 999078 China
Abstract
AbstractAntimony selenosulfide (Sb2(S,Se)3) is an emerging quasi‐1D photovoltaic semiconductor with exceptional photoelectric properties. The low‐symmetry chain structure contains complex defects and makes it difficult to improve electrical properties via doping method. This article reports a doping strategy to enhance the efficiency of Sb2(S,Se)3 solar cells by using alkali halide (CsI) as the hydrothermal reaction precursor. It is found that the Cs and I ions are effectively doped and atomically coordinate with Sb ions and S/Se ions. The CsI‐doping Sb2(S,Se)3 absorbers exhibit enhanced grain morphologies and reduced trap densities. The consequential CsI‐doping Sb2(S,Se)3 based solar cells demonstrate favorable band alignment, suppressed carrier recombination, and improved device performance. An efficiency as high as 10.05% under standard AM1.5 illumination irradiance is achieved. This precursor‐based alkali halide doping strategy provides a useful guidance for high‐efficiency antimony selenosulfide solar cells.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Natural Science Foundation of Guangdong Province
Fundamental Research Funds for the Central Universities