An Qiaoshi, Zhang Jian, Gao Wei, Qi Feng, Zhang Miao, Ma Xiaoling, Yang Chuluo, Huo Lijun, Zhang Fujun
School of Electrical Engineering, Beijing Jiaotong University, 100044, Beijing, China.
Department of Material Science and Technology, Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, 1 Jinji Road, 541004, Guilin, Guangxi, China.
Small. 2018 Nov;14(45):e1802983. doi: 10.1002/smll.201802983. Epub 2018 Oct 10.
Efficient ternary organic solar cells (OSCs) are fabricated by employing a polymer PBT1-C as the donor and two non-fullerene materials, MeIC and MeIC2, as one alloyed acceptor. The optimized ternary OSCs with 30 wt% MeIC2 in acceptors achieve a power conversion efficiency (PCE) of 12.55%, which is much higher than that of 11.47% for MeIC-based binary OSCs and 11.41% for MeIC2-based binary OSCs. The >9.4% improvement in PCE is mainly attributed to the optimized photon harvesting and morphology of ternary active layers, resulting in the simultaneously improved short-circuit current and fill factor. Furthermore, good compatibility and similar lowest unoccupied molecular orbital energy levels of MeIC and MeIC2 are beneficial to form one alloyed acceptor for efficient electron transport in the ternary active layers. This work may provide new insight when selecting the third component for preparing efficient ternary OSCs.
通过使用聚合物PBT1-C作为供体以及两种非富勒烯材料MeIC和MeIC2作为一种合金化受体，制备了高效的三元有机太阳能电池（OSC）。在受体中含有30 wt% MeIC2的优化三元OSC实现了12.55%的功率转换效率（PCE），这远高于基于MeIC的二元OSC的11.47%以及基于MeIC2的二元OSC的11.41%。PCE提高>9.4%主要归因于三元活性层优化的光子捕获和形态，从而使短路电流和填充因子同时得到改善。此外，MeIC和MeIC2良好的相容性以及相似的最低未占据分子轨道能级有利于形成一种合金化受体，以在三元活性层中实现高效电子传输。这项工作在选择制备高效三元OSC的第三组分时可能会提供新的见解。
