Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 3, Pages 3668-3676Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c00091
Keywords
cadmium alloy; spin coating; heterojunction; conduction band offset; band bending; flexible CZTS solar cells
Funding
- National Natural Science Foundation of China [61774084]
- special fund of Jiangsu Province for the transformation of scientific and technological achievements [BA2019047]
- open project of Key Laboratory of Materials Preparation and Protection for Harsh Environment, Ministry of Industry and Information Technology [XCA20013-3]
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Flexible CZTS solar cells with multicycle CZTS/CCZTS stack structures were prepared using a green and simple solution spin-coating method to overcome the limitations of flexible devices. The optimized Zn/Cd ratio resulted in CCZTS films with large grain longitudinal growth. A stacked structure of CZTS and CCZTS with different periods improved the surface morphology of the absorber film and matched the energy band of CZTS/CCZTS/CdS heterojunction. The flexible solar cell achieved a high photoelectric conversion efficiency of 6.51% and showed excellent resistance to mechanical bending.
Flexible CZTS solar cells have attracted significant attention in recent years owing to their high earth element composition and high photovoltaic conversion efficiency. However, these cells are associated with limitations common in compound thin-film solar cells, such as heterojunction interface combination centers, material defects, and energy level mismatch. In the current study, a green and simple solution spin-coating method is proposed for the preparation of flexible solar cells with multicycle CZTS/CCZTS absorber stacked structures to effectively circumvent the limitations of flexible devices. The results showed that the optimized Zn/Cd ratio results in CCZTS films with large grain longitudinal growth. However, lots of small broken grains were formed at the bottom of the absorber owing to the large lattice spacing, leading to the formation of cell leakage channels. The surface morphology of the absorber film was improved by preparing a stacked structure of CZTS and CCZTS with different periods while suppressing the longitudinal grain delamination. The stacked structure also helps to match the energy band of CZTS/CCZTS/CdS heterojunction. The top layer of CCZTS forms a buffered energy band ladder in the energy band of the CZTS/CdS heterojunction, thus suppressing the rapid carrier recombination caused by the Cliff-type energy band bending. A flexible solar cell was thus prepared to obtain a high photoelectric conversion efficiency of 6.51%, and the cells showed excellent resistance to mechanical bending.
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