Journal
SOLAR RRL
Volume 5, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202100418
Keywords
band bending; carrier density; CZTS solar cells; interface defects; interface recombination
Funding
- Australian Government through the Australian Renewable Energy Agency (ARENA) [RND006]
- Australian Research Council (ARC), Baosteel [LP150100911]
- Australian Centre for Advanced Photovoltaics (ACAP) [RG200768-A]
- National Natural Science Foundation of China [61704066]
- Natural Science Foundation of Guangdong Province [2017A030310479]
- Australian Research Council [LP150100911] Funding Source: Australian Research Council
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The study identified critical factors governing the interface recombination in CZTS solar cells, including the carrier density of the absorber and acceptor-like interface defects. Eliminating interface defects and adjusting absorber carrier density are essential ways to improve the performance of CZTS solar cells.
Kesterite Cu2ZnSnS4 (CZTS) solar cell has emerged as one of the most promising thin-film photovoltaic technologies that allows for cheap, clean, and efficient renewable power in the future. Nevertheless, limited by the large photovoltage deficit caused by severe interface recombination, the potential of CZTS solar cells is far from being fully tapped. Herein, it is demonstrated that the carrier density of the CZTS absorber and the acceptor-like interface defects are two critical factors governing the interface recombination in addition to the unfavorable conduction band alignment. Results of device simulation suggest that passivating the acceptor-like interface defects combined with appropriate absorber carrier density is the essential way to promote the photovoltage and efficiency of CZTS solar cells to a more competitive level. It is believed that these results could be generally applicable to the interface recombination of other heterojunction solar cells.
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