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化学学院陈永胜课题组Advanced Materials，通讯作者：万相见，陈永胜
Advanced Materials Early View First published: 25 March 2019 10.1002/adma.201804723
https://onlinelibrary.wiley.com/doi/10.1002/adma.201804723
A Tandem Organic Solar Cell with PCE of 14.52% Employing Subcells with the Same Polymer Donor and Two Absorption Complementary Acceptors
Lingxian Meng#, Yuan-Qiu-Qiang Yi#, Xiangjian Wan,* Yamin Zhang, Xin Ke, Bin Kan, Yanbo Wang, Ruoxi Xia, Hin-Lap Yip, Chenxi Li, and Yongsheng Chen*
L. Meng, Y.-Q.-Q. Yi, Dr. X. Wan, Y. Zhang, X. Ke, B. Kan, Y. Wang, Prof. C. Li, Prof. Y. Chen
The Key Laboratory of Functional Polymer Materials, State Key Laboratory and Institute of Elemento-Organic Chemistry, Centre of Nanoscale Science and Technology, College of Chemistry, Nankai University, Tianjin 300071, China
E-mail: xjwan@nankai.edu.cn; yschen99@nankai.edu.cn
R. Xia, Prof. H.-L. Yip
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
L.M. and Y.-Q.-Q.Y. contributed equally to this work.
Abstract
The tandem structure is an efficient way to simultaneously tackle absorption and thermalization losses of the single junction solar cells. In this work, a high‐performance tandem organic solar cell (OSC) using two subcells with the same donor poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)‐benzo[1,2‐b:4,5‐b′]dithiophene))‐alt‐(5,5‐(1′,3′‐di‐2‐thienyl‐5′,7′‐bis(2‐ethylhexyl)benzo[1′,2′‐c:4′,5′‐c′]dithiophene‐4,8‐dione))] (PBDB‐T) and two acceptors, F‐M and 2,9‐bis(2‐methylene‐(3(1,1‐dicyanomethylene)benz[f ]indanone))7,12‐dihydro‐(4,4,10,10‐tetrakis(4‐hexylphenyl)‐5,11‐diocthylthieno[3′,2′:4,5]cyclopenta[1,2‐b]thieno[2″,3″:3′,4′]cyclopenta[1′,2′:4,5]thieno[2,3‐f][1]benzothiophene (NNBDT), with complementary absorptions is demonstrated. The two subcells show high Voc with value of 0.99 V for the front cell and 0.86 V for the rear cell, which is the prerequisite for obtaining high Voc of their series‐connected tandem device. Although there is much absorption overlap for the subcells, a decent Jsc of the tandem cell is still obtained owing to the complementary absorption of the two acceptors in a wide range. With systematic device optimizations, a best power conversion efficiency of 14.52% is achieved for the tandem device, with a high Voc of 1.82 V, a notable FF of 74.7%, and a decent Jsc of 10.68 mA cm−2. This work demonstrates a promising strategy of fabricating high‐efficiency tandem OSCs through elaborate selection of the active layer materials in each subcell and tradeoff of the Voc and Jsc of the tandem cells.
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