光降解
光化学
有机太阳能电池
光电流
化学
部分
接受者
噻吩
材料科学
立体化学
有机化学
聚合物
光催化
催化作用
物理
光电子学
凝聚态物理
作者
Yuxuan Che,Muhammad Rizwan Niazi,Ricardo Izquierdo,Dmitrii F. Perepichka
标识
DOI:10.1002/anie.202109357
摘要
Herein, we elucidate the photodegradation pathway of A-D-A-type non-fullerene acceptors for organic photovoltaics. Using IT-4F as a benchmark example, we isolated the photoproducts and proved them isomers of IT-4F formed by a 6-e electrocyclic reaction between the dicyanomethylene unit and the thiophene ring, followed by a 1,5-sigmatropic hydride shift. This photoisomerization was accelerated under inert conditions, as explained by DFT calculations predicting a triplet-mediated reaction path (quenchable by oxygen). Adding controlled amounts of the photoproduct P1 to PM6:IT-4F bulk heterojunction cells led to a progressive decrease in photocurrent and fill factor attributed to its poor absorption and charge transport properties. The reaction is a general photodegradation pathway for a series of A-D-A molecules with 1,1-dicyanomethylene-3-indanone termini, and its rate varies with the structure of the donor and acceptor moiety.
科研通智能强力驱动
Strongly Powered by AbleSci AI