Dialkoxymethano[60]fullerenes as electron acceptors in thin-film organic solar cells
作者:Mohammed Y. Suleiman、Yue Ma、Takafumi Nakagawa、Hiroshi Ueno、Yutaka Matsuo
DOI:10.1016/j.tet.2019.130514
日期:2019.9
This study presents the synthesis, characterization, and electrochemical properties of four new dialkoxymethanofullerenes, as well as their performance in organic solar cells (OSCs) devices. Dialkoxymethanofullerenes were synthesized in 27%-32% yield by thermolysis of dialkoxyoxadiazolines and reaction with C-60 under reflux in toluene. The prepared compounds were then characterized and used for the first time as electron-acceptor materials in thin-film bulk heterojunction OSCs with PBTZT-stat-BDTT-8 as the electron donor material. The devices made with ethoxy-hexyloxymethanofullerene and methoxy-hexyloxymethanofullerene exhibited optimal power conversion efficiencies (PCEs) of 3.79% and 4.65%, with open-circuit voltage of 0.832 and 0.831 V, respectively. In contrast, the devices made with ethoxy-ethoxymethanofullerene and methoxy-ethoxymethanofullerene exhibited very low PCEs of <0.01% for both, indicating a large impact of the substituents on device performance. (C) 2019 Elsevier Ltd. All rights reserved.