Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Bulk heterojunction (BHJ) solar cells based on colloidal QDs and metal oxide nanowires (NW) possess unique and outstanding advantages in light harvesting and charge collection. However, the high surface area of NW structure often brings about large amount of recombination (especially interfacial recombination) and limits the open-circuit voltage in BHJ solar cells. This problem is solved here by passivating the surface of metal oxide component in PbS colloidal quantum dot solar cells (CQDSCs). By coating thin TiO2 layers on ZnO-NW surfaces, the open-circuit voltage and power conversion efficiency have been improved over 40% in PbS CQDSCs. The transient photovoltage decay and impedance spectroscopy characterizations indicated that the interfacial recombination was significantly reduced by using the ZnO@TiO2 core-shell nanowire arrays. High efficiency of 6.13% was achieved through the optimization for the length of ZnO-NW arrays and the coating of TiO2 layers (device active area: 16 mm2). All solar cells were tested under air conditions, and exhibited excellent air storage stability (without any performance decline over more than 130 days). This work highlights on the significance of metal oxide passivation in achieving high performance BHJ solar cells. The charge recombination mechanism uncovered in this work would also shed light on the further improvement of PbS CQDSCs and/or other types of solar cells.
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