Thin-Film Solar Cells Based on Selenized CuSbS<sub>2</sub> Absorber
Copper antimony sulfide (CuSbS<sub>2</sub>) has attracted significant interest as an earth-abundant photovoltaic absorber. However, the efficiency of the current CuSbS<sub>2</sub> photovoltaic device is too low to meet the requirement of a large-scale application. In this stu...
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| Autores principales: | , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/288d422de20a48ad9bad801bdf2adf67 |
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| Sumario: | Copper antimony sulfide (CuSbS<sub>2</sub>) has attracted significant interest as an earth-abundant photovoltaic absorber. However, the efficiency of the current CuSbS<sub>2</sub> photovoltaic device is too low to meet the requirement of a large-scale application. In this study, selenylation was introduced to optimize the band structure and improve the device performance. Selenized CuSbS<sub>2</sub> [CuSbS<sub>2</sub>(Se)] films were realized using porous CuSbS<sub>2</sub> films prepared by spray deposition with a post-treatment in Se vapor. The as-prepared CuSbS<sub>2</sub>(Se) films exhibited a compact structure. X-ray diffraction and elemental analysis confirmed the effective doping of Se into the lattice by substituting a part of S in CuSbS<sub>2</sub>. Elemental analysis revealed a gradient distribution for Se from the top surface to the deeper regions, and the substitution rate was very high (>39%). Dark J–V characteristics and AC impedance spectroscopy analysis showed that selenylation significantly reduced the carrier recombination center. As a result, the selenized CuSbS<sub>2</sub> device exhibited a significant efficiency improvement from 0.12% to 0.90%, which is much higher than that of the simply annealed device (0.46%), indicating this technique is a promising approach to improve the performance of CuSbS<sub>2</sub> solar cells. |
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