High-Efficiency Dye-Sensitized Solar Cells: The Influence of Lithium Ions on Exciton Dissociation, Charge Recombination, and Surface States

详细信息    查看全文

• 作者：Qingjiang Yu ; Yinghui Wang ; Zhihui Yi ; Ningning Zu ; Jing Zhang ; Min Zhang ; Peng Wang
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：October 26, 2010
• 年：2010
• 卷：4
• 期：10
• 页码：6032-6038
• 全文大小：387K
• 年卷期：0
• ISSN：1936-086X

文摘

We present a time-saving staining protocol based upon the low-toxicity and nonvolatile solvent dimethyl sulfoxide for a high-efficiency dye-sensitized solar cell, which is very critical for the roll-to-roll flexible cell production. Power conversion efficiencies of 11.7−12.1% were achieved under AM1.5G simulated sunlights. The intrinsic roles of lithium cations on efficiency enhancement were scrutinized by measuring transient absorption and electrical impedance spectroscopies. Our studies have revealed that lithium ions can enhance exciton dissociation at the energy-offset dye/titania interface effectively. Charge collection is not found to be a crucial current loss channel in our high-efficiency dye-sensitized solar cell.