Self-Assembled TiO2 Nanorods as Electron Extraction Layer for High-Performance Inverted Polymer Solar Cells

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• 作者：Longfeng Lv ; Qipeng Lu ; Yu Ning ; Zhenda Lu ; Xin Wang ; Zhidong Lou ; Aiwei Tang ; Yufeng Hu ; Feng Teng ; Yadong Yin ; Yanbing Hou
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：January 13, 2015
• 年：2015
• 卷：27
• 期：1
• 页码：44-52
• 全文大小：645K
• ISSN：1520-5002

文摘

We demonstrate the use of TiO₂ nanorods with well-controlled lengths as excellent electron extraction materials for significantly improving the performance of inverted polymer solar cells. The cells containing long nanorods outperform the devices using amorphous TiO₂ particles as the electron extraction layer, mainly by a 2-fold increase in short-circuit current and fill factor. The enhanced charge extraction is attributed to the high electron mobility in crystalline nanorods and their preferential alignment during film formation. Furthermore, transient photocurrent studies suggest the presence of fewer interfacial and internal defects in the nanorod interlayers, which can effectively decrease carrier recombination and suppress electron trapping.