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Benzothienoisoindigo-based polymers for efficient polymer solar cells with an open-circuit voltage of 0.96?V

Two conjugated polymers have been designed and synthesized by introducing benzothienoisoindigo as electron-withdrawing moieties on side chains. PBDTT-TBID based on alkylthienyl-substituted benzo[1,2-b:4,5-b’]dithiophene (BDT) derivatives as electron-donating moieties possesses a low-lying highest occupied molecular orbital energy level of ?5.38?eV, so its polymer solar cells (PSCs) shows a high open-circuit voltage (Voc) of 0.96?V, which is one of the highest Voc values among benzothienoisoindigo-based polymers. PBDT-TBID based on alkoxyl-substituted BDT derivatives possesses better molecular coplanarity, stronger intramolecular charge transfer, stronger intermolecular ?-? stacking, more suitable microphase separation with PC71BM, more effective exciton dissociation, and higher hole mobility than PBDTT-TBID, which lead to higher short-circuit current density (Jsc?=?11.81?mA?cm?2), fill factor (FF?=?58.38%) and power conversion efficiency (PCE?=?5.87%) values than those based on PBDTT-TBID. The PCE value is still higher than those of the reported benzothienoisoindigo-based polymers though it lags behind those of recent non-fullerene PSCs.

» Author: Jie Lu, Huangshan Zhou, Yufu Yu, Hailu Liu, Lini Peng, Pingxiang He, Bin Zhao

» Reference: 10.1016/j.polymer.2019.05.043

» Publication Date: 21/05/2019

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