Chlorinated polymer solar cells simultaneously enhanced by fullerene and non-fullerene ternary strategies

• 作者: Longzhu Liu Pengjie Chao Daize Mo Feng He
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（3）
• 页码范围: 620-625
• 页数: 6页
• 语种: 英文

摘要

To achieve efficient polymer solar cells(PSCs)with full utilization of the whole spectrum,the multi-component devices are of great importance to be deeply explored,especially for their capability of one-step fabrication.However,the research about one same binary system simultaneously derivated var-ious multi-component PSC is still very limited.Herein,we achieved the whole constructions from one binary host to different ternary systems and even the quaternary one.The ternary strategies with fuller-ene acceptor,PC71BM,and non-fullerene acceptor,BT61C-BO-4CI,as the third component,both boosted the device efficiencies of PBT4C1-Bz:IT-4F binary system from about 9％to comparatively beyond 11％.Despite the comparable improvement of performance,there existed other similarities and differences in two ternary strategies.In detail,the isotropic carrier transport of PC7BM which largely elevated the fill factor(FF)in the corresponding devices,while the strong absorption of BT6IC-BO-4C1 enhanced the short current density(Jsc)most.More interestingly,quaternary devices based on PBT4CI-Bz:IT-4F:PC71BM:BT6IC-BO-4Cl could combine both advantages of fullerene and non-fullerene ternary strategies,further pumped the Jsc from 16.44 to the highest level of 19.66 mA cm-2 among all devices,eventually resulted in an optimized efficiency of 11.69％.It reveals that both fullerene and non-fullerene ternary strategies have their unique feature to elevate the device performance either by efficient isotropic carrier transport or better coverage of whole sunlight spectrum and easy tunable energy levels from organic materials.The key is how to integrate the two pathways in one system and provide a more competitive solution facing high-quality PSCs.