Department of Chemistry , Hong Kong University of Science and Technology , Clear Water Bay Rd , Kowloon 999077 , Hong Kong.
School of Materials Science and Engineering , University of New South Wales (UNSW) , Sydney 2052 , New South Wales , Australia.
ACS Appl Mater Interfaces. 2020 Jan 15;12(2):2313-2318. doi: 10.1021/acsami.9b16164. Epub 2019 Dec 30.
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-PbI/PbS-EDT/NiO/Ag NP/ZnO NP/1.22 eV PbS-PbI/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.
串联电池是打破单结 Shockley-Queisser 限制最有效的方法之一。可溶液处理的磷酸盐缓冲盐水 (PbS) 量子点是制造多结太阳能电池的理想候选材料，因为它们的带隙可调。在串联太阳能电池中连接子电池的中间复合层 (RL) 对器件性能至关重要，因为它决定了电荷复合效率和电阻。在这项工作中，一种溶液处理的超薄 NiO 和 Ag 纳米颗粒薄膜作为中间层，可提高 PbS QD 双结串联太阳能电池中的电荷复合效率。采用器件结构为 ITO/S-ZnO/1.45 eV PbS-PbI/PbS-EDT/NiO/Ag NP/ZnO NP/1.22 eV PbS-PbI/PbS-EDT/Au 的最佳器件实现了 7.1%的功率转换效率，超过了优化后的参考子电池。这一结果突出了适当的纳米晶 RL 在制备高性能溶液处理 PbS QD 串联电池中的关键作用。
