Design, synthesis and photophysical properties of D1-A-D2-A-D1-type small molecules based on fluorobenzotriazole acceptor and dithienosilole core donor for solution processed organic solar cellsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 26 сентября 2016 г.
Аннотация:Two small molecules denoted as K2 and K3 containing fluorine atoms at different positions of benzotriazole,
with linear D1-A-D2-A-D1 configuration based on dithienosilole and fluorobenzotriazole as
donor and acceptor materials, were designed and synthesized for small molecule organic solar cells.
Their optical and electrochemical properties were investigated. We have used these small molecules as
electron donor along with the [6,6]-phenyl C60 butyric acid methyl ester or [6,6]-phenyl C71 butyric acid methyl ester as electron acceptor for the fabrication of solution processed organic bulk heterojunction
solar cells. High power conversion efficiency values of 6.01% and 4.57% were obtained for devices based
on K2:PC71BM and K3:PC71BM active layers with optimized donor to acceptor weight ratios and processed
with a two step annealing treatment. The efficiency of solar cells based on small molecules can be
increased considerably by careful engineering and optimization of molecular structure of the blended
film morphology.