期刊
SOLAR RRL
卷 6, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202101017
关键词
efficiency; energy-level alignments; interfaces; Sb2S3 solar cells; Sb2Se3 hole transport layers
资金
- National Natural Science Foundation of China [52002073, 62074037]
- Natural Science Foundation of Fujian Province, China [2020J05105, 2019J01218]
- Education and Scientific Research Project of Fujian Province, China [JAT190010]
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China [2021ZZ124]
- Open Project Program of the State Key Laboratory of Photocatalysis on Energy and Environment, China [SKLPEE-202011]
By adding Sb2Se3 layers in Sb2S3 solar cells, the power conversion efficiency and fill factor of the cells can be greatly increased, promoting the development of Sb2S3 solar cells.
Sb2S3 has emerged as a promising light-absorbing material due to its nontoxicity, low cost, high stability, and absorption coefficient. However, the absorption spectrum ranges and back-contact barrier between Sb2S3 and Au strongly limit the device performance. p-type Sb2Se3 has a similar lattice structure and properties as Sb2S3, obtaining absorption expansion and ohmic back contact. Herein, efficient all-inorganic planar Sb2S3 solar cells with the addition of Sb2Se3 layers are fabricated. The functions of Sb2Se3 as cooperative absorber (400 nm) and hole transport layers (HTL, 80 nm) are further explored. Systematic characterizations indicate that the junction quality and depletion widths of the device with the addition of Sb2Se3 are improved by forming a p-i-n structure. As a result, the all-inorganic Sb2S3 solar cell with a Sb2Se3 HTL greatly increases the power conversion efficiency from 2.7% to 5.8% and the fill factor from 40% to 55.4%. The additional Sb2Se3/Au interface with matched energy-level alignments reduces the back-contact barrier and facilitates hole transport and collection. The present design and methods promote the development of Sb2S3 solar cells.
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