Novel cathode buffer layer of Ag-doped bathocuproine for small molecule organic solar cell with inverted structure
Novel cathode buffer layer of Ag-doped bathocuproine for small molecule organic solar cell with inverted structure
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DOI：
10.1016/j.orgel.2014.04.030
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发表时间：
2014-08-01
影响因子：
3.2
通讯作者：
Akimoto, Katsuhiro
中科院分区：
文献类型：
--
作者：
Hao, Xia;Wang, Shenghao;Akimoto, Katsuhiro
2，9-二甲基-4，7-二苯基-1，10-菲咯啉(C26H20N2)是传统结构有机太阳能电池(OSCs)中常用的阴极缓冲层，又称偏亚铜(BCP)。我们证明了BCP层在倒置结构OSCS中也可以用作缓冲层。不幸的是，该器件在电流密度-电压(J-V)特性上表现出反常的扭曲，即S形状的J-V曲线，导致低填充因子和低功率转换效率(PCE)。为了提高器件的性能，用掺银的BCP层(Ag：BCP)代替BCP层。结果表明，Ag：BCp层可以消除J-V曲线中的S拐点，使填充因子和相变系数有较大的改善。S型J-V曲线的起源被证明源于富勒烯(C-60)/BCP界面的电荷积累。相反，C-60/Ag：BCP界面具有良好的电子性质，具有有利于自由载流子输运的带隙状态。由于Ag：BCP缓冲层具有良好的导电性和平整的表面性质，大大提高了器件的性能。(C)2014爱思唯尔B.V.保留所有权利。
2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (C26H20N2), known as bathocuproine (BCP), is a commonly used cathode buffer layer in conventional structure organic solar cells (OSCs). We demonstrated that BCP layer can also be used as a buffer layer in inverted structure OSCs. Unfortunately, the device exhibited an anomalous kink in the current density-voltage (J-V) characteristics, namely, an S-shaped J-V curve, leading to a low fill factor and low power conversion efficiency (PCE). To improve device performance, Ag-doped BCP layer (Ag:BCP) was used to replace the BCP layer. The results showed that the Ag: BCP layer can eliminate the S-kink in the J-V curve, resulting in a large improvement of fill factor and PCE. The origin of the S-shaped J-V curve was demonstrated to originate from the charge accumulation at the fullerene (C-60)/BCP interface. On the contrary, the C-60/Ag: BCP interface has favorable electronic properties with beneficial gap states for the transport of free carriers. Together with the good conductivity of Ag: BCP layer and the smooth morphology properties, the device performance was greatly improved by Ag: BCP buffer layer. (C) 2014 Elsevier B. V. All rights reserved.