Chemical Bath Deposition of Stoichiometric CdSe Quantum Dots for Efficient Quantum-Dot-Sensitized Solar Cell Application

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• 作者：Youngwoo Choi ; Minsu Seol ; Wooseok Kim ; Kijung Yong
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：March 20, 2014
• 年：2014
• 卷：118
• 期：11
• 页码：5664-5670
• 全文大小：474K
• 年卷期：v.118,no.11(March 20, 2014)
• ISSN：1932-7455

文摘

Cadmium selenide (CdSe) quantum dots (QDs) have been prepared by suppressing the formation of an amorphous selenium oxide (SeO₂) layer on the surface of CdSe QDs. The precursor ratio for the chemical bath deposition was optimized to minimize the SeO₂ layer growth and develop high-efficiency CdSe QDs for quantum-dot-sensitized solar cell (QDSSC) applications. The morphologies and optical and electrical properties of the CdSe QDs were investigated, and the growth mechanism was also proposed for the CdSe and SeO₂ layer formation. Furthermore, electrochemical impedance spectroscopy results indicated that the SeO₂ layer reduced the recombination resistance of photogenerated electron鈥揾ole pairs, thus degrading the cell efficiency. Therefore, a QDSSC based on an optimized CdSe/CdS/ZnO nanowire photoanode, polysulfide electrolyte, and Au counter electrode can enhance the power conversion efficiency to 4.8% under AM 1.5 G one-sun illumination.