Achieving Both Enhanced Voltage and Current through Fine-Tuning Molecular Backbone and Morphology Control in Organic Solar Cells

Gao, HH (Gao, Huan-Huan)^{[ 1 ]} ; Sun, YN (Sun, Yanna)^{[ 1 ]} ; Cai, Y (Cai, Yao)^{[ 1 ]} ; Wan, XJ (Wan, Xiangjian)^{[ 1 ]} ; Meng, LX (Meng, Lingxian)^{[ 1 ]} ; Ke, X (Ke, Xin)^{[ 1 ]} ; Li, ST (Li, Shitong)^{[ 1 ]} ; Zhang, YM (Zhang, Yamin)^{[ 1 ]} ; Xia, RX (Xia, Ruoxi)^{[ 2 ]} ; Zheng, N (Zheng, Nan)^{[ 2 ]} ; Xie, ZQ (Xie, Zengqi)^{[ 2 ]} ; Li, CX (Li, Chenxi)^{[ 1 ]} ; Zhang, MT (Zhang, Mingtao)^{[ 1 ]} ; Yip, HL (Yip, Hin-Lap)^{[ 2 ]} ; Cao, Y (Cao, Yong)^{[ 2 ]} ; Chen, YS (Chen, Yongsheng)^{[ 1 ]}

ADVANCED ENERGY MATERIALS, 2019, 9(27): 文献号: 1901024

DOI: 10.1002/aenm.201901024

摘要

It is a great challenge to simultaneously improve the two tangled parameters, open circuit voltage (V-oc) and short circuit current density (J(sc)) for organic solar cells (OSCs). Herein, such a challenge is addressed by a synergistic approach using fine-tuning molecular backbone and morphology control simultaneously by a simple yet effective side chain modulation on the backbone of an acceptor-donor-acceptor (A-D-A)-type acceptor. With this, two terthieno[3,2-b]thiophene (3TT) based A-D-A-type acceptors, 3TT-OCIC with backbone modulation and 3TT-CIC without such modification, are designed and synthesized. Compared with the controlled molecule 3TT-CIC, 3TT-OCIC shows power conversion efficiency (PCE) of 13.13% with improved V-oc of 0.69 V and J(sc) of 27.58 mA cm(-2), corresponding to PCE of 12.15% with V-oc of 0.65 V and J(sc) of 27.04 mA cm(-2) for 3TT-CIC-based device. Furthermore, with effective near infrared absorption, 3TT-OCIC is used as the rear subcell acceptor in a tandem device and gave an excellent PCE of 15.72%.