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Signi cant Enhancement in Built-in Potential and Charge Carrier Collection of Organic Solar Cells using 4-(5-hexylthiophene-2-yl)-2,6-bis(5-tri uoromethyl)thiophen-2-yl)pyridine as a Cathode Bu er Layer
Yue Zang1, Kang-li Cao2, Jiang Huang1, Qing Zhang*2, Jun-sheng Yu*1
1.State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China;2.Department of Polymer Science, School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract:
An electron transporting material of TFTTP (4-(5-hexylthiophene-2-yl)-2,6-bis(5-trifluoromethyl)thiophen-2-yl)pyridine) was investigated as a cathode buffer layer to enhance the power efficiency of organic solar cells (OSCs) based on subphthalocyanine and C60. The overall power conversion efficiency was increased by a factor of 1.31 by inserting the TFTTP interfacial layer between the active layer and metallic cathode. The inner mechanism responsible for the performance enhancement of OSCs was systematically studied with the simulation of dark diode behavior and optical field distribution inside the devices as well as the characterization of device photocurrent. The results showed that the TFTTP layer could significantly increase the built-in potential in the devices, leading to the enhanced dissociation of charge transfer excitons. In addition, by using TFTTP as the buffer layer, a better Ohmic contact at C60/metal interface was formed, facilitating more efficient free charge carrier collection.
Key words:  Organic solar cells, Cathode buffer layer, Built-in potential, Charge carrier collection, Optical spacer effect
FundProject:
TFTTP作为阴极缓冲层提高有机薄膜太阳能电池的内建电场和载流子收集效率
臧月1, 曹康丽2, 黄江1, 张清*2, 于军胜*1
1.电子科技大学光电信息学院,电子薄膜与集成器件国家重点实验室,成都 610054;2.上海交通大学化学化工学院,上海 200240
摘要:
采用一种新型的电子传输材料TFTTP作为阴极缓冲层提高基于SubPc/C60异质结的有机薄膜太阳能电池的性能. 通过在有机活性层和金属电极之间加入TFTTP界面层,器件的能量转换效率提高了约30%. 系统研究了器件的二极管特性、光电流特性以及内部的光场分布情况,结果表明,TFTTP阴极缓冲层的引入可以有效地提高器件的内建电场,进而增加电荷转移激子的分离效率. 通过使用TFTTP作为阴极缓冲层,在C60/金属界面形成良好的欧姆接触,降低了界面接触电阻,有利于自由载流子的收集.
关键词:  有机薄膜太阳能电池,阴极缓冲层,内建电场
DOI:10.1063/1674-0068/27/05/593-599
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