11.2％ Efficiency all-polymer solar cells with high open-circuit voltage

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（7）
• 页码范围: 845-850
• 页数: 6页
• 语种: 英文

摘要

Herein,we fabricated all-polymer solar cells (al1-PSCs) based on a fluorinated wide-bandgap p-type conjugated polymer PM6 as the donor,and a narrow bandgap n-type conjugated polymer PZ1 as the acceptor.In addition to the complementary absorption and matching energy levels,the optimized blend films possess high cystallinity,predominantly face-on stacking,and a suitable phase separated morphology.With this active layer,the devices exhibited a high Voc of 0.96 V,a superior Jsc of 17.1 mA cm-2,a fine fill factor (FF) of 68.2％,and thus an excellent power conversion efficiency (PCE) of 11.2％,which is the highest value reported to date for single-junction all-PSCs.Furthermore,the devices showed good storage stability.After 80 d of storage in the N2-filled glovebox,the PCE still remained over 90％ of the original value.Large-area devices (1.1 cm2) also demonstrated an outstanding performance with a PCE of 9.2％,among the highest values for the reported large-area all-PSCs.These results indicate that the PM6:PZ1 blend is a promising candidate for scale-up production of large area high-performance all-PSCs.