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http://dx.doi.org/10.7464/ksct.2010.16.4.292

Quantum Dot Sensitized Solar Cell Using PbS/ZnO Nanowires  

Kim, Woo-Seok (Department of Chemical Engineering, Pohang University of Science and Technology)
Yong, Ki-Jung (Department of Chemical Engineering, Pohang University of Science and Technology)
Publication Information
Clean Technology / v.16, no.4, 2010 , pp. 292-296 More about this Journal
Abstract
We fabricated quantum dot sensitized solar cells(QDSSC) using PbS as a sensitizer and measured the solar energy conversion efficiency. After growing ZnO nanowires on the substrate by low temperature ammonia solution reaction, PbS QDs were deposited on ZnO nanowires by SILAR(Successive ionic layer adsorption and reaction) method. The morphology and crystallinity of PbS/ZnO nanowires were studied by SEM and XRD. In this study, the maximum conversion efficiency of QDSSC using PbS was 0.075% at one sun, which was lower than that of QDSSC using other sensitizers. The reasons it showed relatively low efficiency are i) the probability of type-I band gap arrangement between ZnO and PbS, ii) disturbance of electron migration by the various-sized PbS band gap, iii) stability dip by the chemical reaction of PbS QDs with electrolyte. To solve these problems, researches about controlling the size distribution of PbS and new type electrolyte would be needed.
Keywords
Quantum dot; Solar cell; PbS; SILAR;
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