Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Colloidal quantum dots (CQDs) composed of compound semiconductors such as PbS, PbSe, and CdS have been gaining much attention as promising constituent materials for next-generation solar cells. This is partly because the position of intense exciton absorption bands can be tuned by selecting suitable compositions of the semiconductors as well as quantum dot size so as to cover the entire solar spectral region. Moreover, CQDs are compatible with low-cost solution processes for solar cell fabrication. We have reported PbS CQD-based heterojunction solar cells by employing ZnO nanowire (NW) arrays not only to establish carrier pathways but also to increase light harvesting efficiency. The morphology of ZnO NW arrays was systematically investigated to meet those two requirements. The solar cells with the PbS-QD/ZnO-NW bulk heterojunction (BHJ) structures made up of densely-grown thin ZnO NWs about 1200 nm long yielded a maximum external quantum efficiency of approximately 60% in the near-IR region (@1020 nm) and over 80% in the visible region [1], and achieved 3000-h stability under continuous one-sun light soaking [2]. Recently, we also studied photocurrent properties of the PbS-QD/ZnO-NW solar cells by focusing on the solar cell structure, and confirmed that, once good electron pathways are established in the PbS-QD/ZnO-NW BHJ structure, holes in the PbS region can diffuse a distance over 1000 nm. The power conversion efficiency then reached over 7%.
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