Wu Rongfang, Yang Yuehua, Li Miaozi, Qin Donghuan, Zhang Yangdong, Hou Lintao
Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou 510640, China.
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
Nanomaterials (Basel). 2017 Jul 28;7(8):201. doi: 10.3390/nano7080201.
PbS colloidal quantum dots (CQDs) solar cells have already demonstrated very impressive advances in recent years due to the development of many different techniques to tailor the interface morphology and compactness in PbS CQDs thin film. Here, n-hexane, n-octane, n-heptane, isooctane and toluene or their hybrids are for the first time introduced as solvent for comparison of the dispersion of PbS CQDs. PbS CQDs solar cells with the configuration of PbS/TiO₂ heterojunction are then fabricated by using different CQDs solution under ambient conditions. The performances of the PbS CQDs solar cells are found to be tuned by changing solvent and its content in the PbS CQDs solution. The best device could show a power conversion efficiency (PCE) of 7.64% under AM 1.5 G illumination at 100 mW cm in a n-octane/isooctane (95%/5% /) hybrid solvent scheme, which shows a ~15% improvement compared to the control devices. These results offer important insight into the solvent engineering of high-performance PbS CQDs solar cells.
近年来，由于开发了许多不同技术来调整硫化铅（PbS）胶体量子点（CQD）薄膜的界面形态和致密性，PbS CQD太阳能电池已经取得了非常令人瞩目的进展。在此，首次引入正己烷、正辛烷、正庚烷、异辛烷和甲苯或它们的混合物作为溶剂，以比较PbS CQD的分散情况。然后在环境条件下，使用不同的CQD溶液制备具有PbS/TiO₂异质结结构的PbS CQD太阳能电池。研究发现，通过改变PbS CQD溶液中的溶剂及其含量，可以调节PbS CQD太阳能电池的性能。在正辛烷/异辛烷（95%/5%）混合溶剂体系中，最佳器件在100 mW/cm²的AM 1.5 G光照下可实现7.64%的功率转换效率（PCE），与对照器件相比提高了约15%。这些结果为高性能PbS CQD太阳能电池的溶剂工程提供了重要的见解。
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