期刊
CHEMICAL ENGINEERING JOURNAL
卷 446, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137400
关键词
Sb 2 S 3 solar cell; Bi doping; Band gap; Energy level; First-principles calculation
资金
- National Natural Science Foundation of China [61974028, 11874113]
- Natural Science Foundation of Fujian Province of China [2020J02018]
In this study, a cationic bismuth-doping strategy was applied to modify the energy level and band structure of Sb2S3 film. The optimized band structure significantly improved the light-harvesting and hole extraction efficiency. Additionally, suitable doping of Bi enhanced the grain size and preferred orientation of the absorber layer, leading to higher device efficiency and short-circuit current density compared to pristine Sb2S3.
Sb2S3 has attracted widespread attention as a photovoltaic absorber material owing to its excellent photoelectric properties. However, the performance of Sb2S3-based solar cells is partly limited by its inappropriate band structure, such as deep valence band maximum (VBM) and wide bandgap, which critically lowers hole extraction efficiency and sets a threshold for attainable short-circuit current density (Jsc). Herein, a cationic bismuth-doping is applied to manipulate the energy level of Sb2S3 film by a hydrothermal process. As a result, the alloyed (Bi, Sb)2S3 delivers a redshift of absorption edge and an upshifted VBM, which are in line with our first-principles calculation. The optimized band structure markedly increases the light-harvesting and hole extraction efficiency. Additionally, the suitable doping of Bi also enhances grain size and preferred [hk1] orientation of absorber layer, consequentially favoring the carrier transport. Finally, this Bi-doping tactic boosts the device efficiency from 3.98 to 5.20% and Jsc from 12.58 to 15.38 mA/cm2 compared with pristine Sb2S3. This work paves an avenue for cationic-doping strategy in Sb2S3 solar cell.
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