Exploration of Metal Chloride Uptake for Improved Performance Characteristics of PbSe Quantum Dot Solar Cells

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• 作者：Ashley R. Marshall ; Matthew R. Young ; Arthur J. Nozik ; Matthew C. Beard ; Joseph M. Luther
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：August 6, 2015
• 年：2015
• 卷：6
• 期：15
• 页码：2892-2899
• 全文大小：443K
• ISSN：1948-7185

文摘

We explored the uptake of metal chloride salts with +1 to +3 metals of Na⁺, K⁺, Zn²⁺, Cd²⁺, Sn²⁺, Cu²⁺, and In³⁺ by PbSe QD solar cells. We also compared CdCl₂ to Cd acetate and Cd nitrate treatments. PbSe QD solar cells fabricated with a CdCl₂ treatment are stable for more than 270 days stored in air. We studied how temperature and immersion times affect optoelectronic properties and photovoltaic cell performance. Uptake of Cd²⁺ and Zn²⁺ increase open circuit voltage, whereas In³⁺ and K⁺ increase the photocurrent without influencing the spectral response or first exciton peak position. Using the most beneficial treatments we varied the bandgap of PbSe QD solar cells from 0.78 to 1.3 eV and find the improved V_OC is more prevalent for lower bandgap QD solar cells.