Significant Enhancement in Built-in Potential and Charge Carrier Collection of Organic Solar Cells using 4-(5-hexylthiophene-2-yl)-2,6-bis(5-trifluoromethyl)thiophen-2-yl)pyridine as a Cathode Buffer Layer
Significant Enhancement in Built-in Potential and Charge Carrier Collection of Organic Solar Cells using 4-(5-hexylthiophene-2-yl)-2,6-bis(5-trifluoromethyl)thiophen-2-yl)pyridine as a Cathode Buffer Layer
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DOI：
10.1063/1674-0068/27/05/593-599
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发表时间：
2014-10
影响因子：
1
通讯作者：
Y. Zang;Kang-li Cao;Jiang Huang;Qing Zhang;Junsheng Yu
中科院分区：
文献类型：
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作者：
Y. Zang;Kang-li Cao;Jiang Huang;Qing Zhang;Junsheng Yu
研究了电子传输材料 TFTTP（4-（5-己基噻吩-2-基）-2,6-双（5-三氟甲基）噻吩-2-基）吡啶）作为阴极缓冲层，以提高基于亚酞菁和 C60 的有机太阳能电池（OSC）的功率效率。通过在有源层和金属阴极之间插入TFTTP界面层，整体功率转换效率提高了1.31倍。通过模拟器件内部的暗二极管行为和光场分布以及器件光电流的表征，系统地研究了OSC性能增强的内在机制。结果表明，TFTTP层可以显着增加器件的内建电势，从而增强电荷转移激子的解离。此外，通过使用TFTTP作为缓冲层，在C60/金属界面处形成更好的欧姆接触，有利于更有效的自由载流子收集。
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.