Efficient and thermally stable all-polymer solar cells based on a fluorinated wide-bandgap polymer donor with high crystallinity
Wenyan Su‡a, Yuan Meng‡a, Xia Guo*a(国霞), Qunping Fan a, Ming Zhang b, Yufeng Jiang c, Zhuo Xu a, Yu Dai a, Beichen Xie a, Feng Liu*b(刘烽), Maojie Zhang*a(张茂杰), Thomas P. Russell c and Yongfang Li ad
a Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
b Department of Physics and Astronomy, Shanghai Jiaotong University, Shanghai, China.
c Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA d Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
‡ These authors contributed equally to this work.
J. Mater. Chem. A, 2018, 6, 16403--16411
All-polymer solar cells (all-PSCs) based on an n-type polymer as an acceptor material and a p-type polymer as a donor material have attracted great attention due to their excellent device stability. However, a systematic study of the thermal stability of all-PSCs has not been reported to date. Herein, we developed a highly efficient and thermally stable all-PSCs based on a fluorinated wide-bandgap polymer donor (PFBZ) and a narrow-bandgap polymer acceptor (N2200). The PFBZ:N2200 pair exhibited complementary absorption spectra, matched energy levels, and good blend morphology. As a result, PFBZ:N2200-based devices after thermal annealing at 150 °C for 15 min achieved a high power conversion efficiency (PCE) of 8.1% with a high open-circuit voltage of 0.90 V, a short-circuit current density of 13.5 mA cm−2, a fill factor of 67.0%, as well as a low energy loss of 0.56 eV. The efficiency of 8.1% is one of the highest values reported for the additive-free all-PSCs. When the thermal annealing time was extended to 180 min or the temperature was increased to 250 °C, the all-PSCs retained a high PCE of over 7%. These results indicate that the PFBZ:N2200-based all-PSCs with high efficiency and excellent thermal stability are promising candidates for the practical applications of OSCs.
链接:https://pubs.rsc.org/en/Content/ArticleLanding/2018/TA/C8TA05376F#!divAbstract