国霞副教授、张茂杰教授与上海交通大学刘烽教授合作在 J. Mater. Chem. A上发表研究论文

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, 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