Wei Yuyao, Nakamura Mako, Ding Chao, Liu Dong, Li Hua, Li Yusheng, Yang Yongge, Wang Dandan, Wang Ruixiang, Hayase Shuzi, Masuda Taizo, Shen Qing
Faculty of Informatics and Engineering, The University of Electro Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan.
Beijing Engineering Research Centre of Sustainable Energy and Buildings, Beijing University of Civil Engineering and Architecture, No.15 Yongyuan Road, Huangcun, Daxing, Beijing 102616, China.
ACS Appl Mater Interfaces. 2022 Aug 10;14(31):36268-36276. doi: 10.1021/acsami.2c10508. Epub 2022 Jul 27.
Zinc oxide (ZnO) nanowire (NW) based lead sulfide (PbS) quantum dot solar cells (QDSCs), i.e., bulk heterojunction QDSCs, have been widely investigated because of the excellent photoelectronic properties of PbS QDs and ZnO NWs. To further improve the efficiency of this type of QDSCs, various passivation methods are applied to ZnO NWs to suppress interface recombination caused by trap defects. However, the comparison among passivation using organic, inorganic, and inorganic-organic hybrid materials with different properties has been less studied. In this work, the effect of passivation with inorganic Mg-doped ZnO (ZMO), organic 1,2-ethanedithiol (EDT) and both of them on ZnO NWs and PbS QDSCs are investigated. As a result, ZnO NWs purely passivated by organic material EDT show the best performance with fewer surface defects and better matched energy level with the PbS QD layer. A nearly 1.7 times larger power conversion efficiency (PCE) of 6.9% is achieved for the solar device using ZnO NW @EDT, compared with that (4.1%) of the untreated one. The work provides a promising way to impede interlayer charge recombination and facilitate carrier transport, thus enhancing the photovoltaic performance of the device.
基于氧化锌（ZnO）纳米线（NW）的硫化铅（PbS）量子点太阳能电池（QDSCs），即体异质结量子点太阳能电池，由于硫化铅量子点（PbS QDs）和氧化锌纳米线（ZnO NWs）优异的光电性能而受到广泛研究。为了进一步提高这类量子点太阳能电池的效率，人们采用了各种钝化方法来处理氧化锌纳米线，以抑制由陷阱缺陷引起的界面复合。然而，对于使用具有不同性质的有机、无机和无机 - 有机杂化材料进行钝化的比较研究较少。在这项工作中，研究了用无机镁掺杂氧化锌（ZMO）、有机1,2 - 乙二硫醇（EDT）以及两者对氧化锌纳米线和硫化铅量子点太阳能电池的钝化效果。结果表明，仅用有机材料EDT钝化的氧化锌纳米线表现出最佳性能，表面缺陷更少，与硫化铅量子点层的能级匹配更好。与未处理的器件（4.1%）相比，使用氧化锌纳米线@EDT的太阳能器件实现了近1.7倍更高的功率转换效率（PCE），达到6.9%。这项工作为阻碍层间电荷复合和促进载流子传输提供了一种有前景的方法，从而提高了器件的光伏性能。
