Nonfullerene acceptors with cyano-modified terminal groups for organic solar cells: Effect of substitution position on photovoltaic properties
作者:Tong Wang、Ruiqi An、Mengqi Cao、Haiyang Shu、Xiaofu Wu、Hui Tong、Lixiang Wang
DOI:10.1016/j.dyepig.2022.110661
日期:2022.10
groups at mixed γ/δ position, the acceptor with cyano substituted at the β position shows more twisted structure and slightly higher energy level. When a wide bandgap polymer PM6 is adopted as the donor, the blend film with β-cyano substituted acceptor shows more suitable phase separation morphology and more balanced charge transport. The device based on the β-cyano substituted acceptor achieves a
开发了两种以氰基修饰的1,1-二氰基亚甲基-3-茚满酮(IC)为端基和二噻吩并噻吩[3,2- b ]-吡咯并苯并噻二唑(BTP)单元为核心的非富勒烯受体。两个电子受体表现出强烈的分子内电荷转移吸收,最大吸收峰在 832 nm,吸收边缘延伸至 953 nm,对应窄带隙低至 1.30 eV。与在混合γ/δ位具有氰基的电子受体相比,在β位具有氰基取代的电子受体表现出更多的扭曲结构和略高的能级。当采用宽带隙聚合物PM6作为供体时,β-氰基取代受体的共混薄膜表现出更合适的相分离形貌和更平衡的电荷传输。基于 β-氰基取代受体的器件实现了 0.88 V 的更大开路电压 ( V OC ) 比在混合 γ/δ 位具有氰基的受体 ( V OC ) = 0.78 V),能量损失计算为0.45 eV,与具有γ/δ-氰基取代受体的器件(PCE = 11.08%)相比,功率转换效率(PCE)高达12.41%。