Study of Electronic Defects in CdSe Quantum Dots and Their Involvement in Quantum Dot Solar Cells

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• 作者：Ruben Loef ; Arjan J. Houtepen ; Elise Talgorn ; Joop Schoonman ; Albert Goossens
• 刊名：Nano Letters
• 出版年：2009
• 出版时间：February 11, 2009
• 年：2009
• 卷：9
• 期：2
• 页码：856-859
• 全文大小：122K
• 年卷期：v.9,no.2(February 11, 2009)
• ISSN：1530-6992

文摘

To enhance efficiencies of quantum dot CdSe/TiO₂ based solar cells, understanding of the space charge at the CdSe/TiO₂ interface is crucial. In this paper, the presence of a shallow acceptor in the CdSe quantum dots is found by means of a detailed impedance and Mott−Schottky (C⁻²−) study. Furthermore, it is clearly shown that this acceptor density decreases strongly with increasing quantum dot size. The presence of these defect states may give rise to Auger recombination in small quantum dots and therewith decrease the efficiency of quantum-dot-sensitized solar cells.