Design and synthesis of acceptor–donor–acceptor small molecule based on caffeine derivative for efficient and stable polymer solar cells

Publication date: 25 July 2019Source: Journal of Industrial and Engineering Chemistry, Volume 75Author(s): Ye Jin Lee, Sung Jae Jeon, Jun Young Choi, Doo Kyung MoonAbstractWe designed and synthesized IDTBTCf (Indacenodithiophene-benzothiadiazolecaffeine) non-fullerene acceptor by using the caffeine derivative as the electron withdrawing end-group. It showed strong polarization that is possible to improve stability by causing non-covalent interaction in active layer. When 2.5 wt% IDTBTCf was introduced as the third component in PTB7:PC71BM binary blend, the power conversion efficiency (PCE) is more higher value of 8.7% than the reference (8.4%). As a result of stability measurement without encapsulation in a glove box for 172 h, a device with IDTBTCf (degradation rate of efficiency, 8%) showed better stability than the reference one (degradation rate of efficiency, 15.5%).Graphical abstract

Source: Journal of Industrial and Engineering Chemistry - April 13, 2019 Category: Chemistry Source Type: research