Journal
ADVANCED MATERIALS
Volume 34, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202109078
Keywords
Sb; Se-2; (3); heterojunctions; defects; open-circuit voltage; thin-film solar cells
Categories
Funding
- National Natural Science Foundation of China [62074102, 62104157, 62104156]
- Key Project of Department of Education of Guangdong Province [2018KZDXM059]
- Science and Technology plan project of Shenzhen [JCYJ20190808153409238]
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This study reports an effective interface engineering approach using rapid thermal annealing to suppress nonradiative recombination near the Sb2Se3/CdS heterojunction, improving the performance of thin-film solar cells.
Despite the fact that antimony triselenide (Sb2Se3) thin-film solar cells have undergone rapid development in recent years, the large open-circuit voltage (V-OC) deficit still remains as the biggest bottleneck, as even the world-record device suffers from a large V-OC deficit of 0.59 V. Here, an effective interface engineering approach is reported where the Sb2Se3/CdS heterojunction (HTJ) is subjected to a post-annealing treatment using a rapid thermal process. It is found that nonradiative recombination near the Sb2Se3/CdS HTJ, including interface recombination and space charge region recombination, is greatly suppressed after the HTJ annealing treatment. Ultimately, a substrate Sb2Se3/CdS thin-film solar cell with a competitive power conversion efficiency of 8.64% and a record V-OC of 0.52 V is successfully fabricated. The device exhibits a much mitigated V-OC deficit of 0.49 V, which is lower than that of any other reported efficient antimony chalcogenide solar cell.
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