期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 2, 页码 2313-2318出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b16164
关键词
tandem solar cell; PbS quantum dots; complementary absorption; recombination layer; intermediate layer
资金
- Department of Chemistry (CHEM) at The Hong Kong University of Science and Technology (HKUST)
- School of Sciences (SSCI) at The Hong Kong University of Science and Technology (HKUST)
Tandem cells are one of the most effective ways of breaking the single junction Shockley-Queisser limit. Solution-processable phosphate-buffered saline (PbS) quantum dots are good candidates for producing multiple junction solar cells because of their size-tunable band gap. The intermediate recombination layer (RL) connecting the subcells in a tandem solar cell is crucial for device performance because it determines the charge recombination efficiency and electrical resistance. In this work, a solution-processed ultrathin NiO and Ag nanoparticle film serves as an intermediate layer to enhance the charge recombination efficiency in PbS QD dual-junction tandem solar cells. The champion devices with device architecture of indium tin oxide/S-ZnO/1.45 eV PbS-PbI2/PbS-EDT/NiO/Ag NP/ZnO NP/1.22 eV PbS-PbI2/PbS-EDT/Au deliver a 7.1% power conversion efficiency, which outperforms the optimized reference subcells. This result underscores the critical role of an appropriate nanocrystalline RL in producing high-performance solution-processed PbS QD tandem cells.
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