共轭体系
接受者
小分子
噻吩
吡嗪
分子
能量转换效率
作者
Bo Xiao,Ailing Tang,Jing Yang,Asif Mahmood,Xiangnan Sun,Erjun Zhou
标识
DOI:10.1021/acsami.8b00216
摘要
We used the quinoxaline (Qx) unit to design and synthesize two nonfullerene small-molecule acceptors of Qx1 and Qx1b with an A2-A1-D-A1-A2 skeleton, where indacenodithiophene (IDT), Qx, and rhodanine (R) were adopted as the central donor (D), bridge acceptors (A1), and terminal acceptors (A2), respectively. Qx1 and Qx1b contain different side chains of 4-hexylphenyl and octyl in the central IDT segment to modulate the properties of final small molecules. Both small molecules show good thermal stability, high solubility, and strong and broad absorption spectra with optical band gaps of 1.74 and 1.68 eV, respectively. Qx1 and Qx1b exhibit the complementary absorption spectra with the classic poly(3-hexylthiophene) (P3HT) and the high-lying lowest unoccupied molecular orbital energy levels of −3.60 and −3.66 eV, respectively. Polymer solar cells based on P3HT:Qx1 showed a high open-circuit voltage (Voc) of 1.00 V and a power conversion efficiency (PCE) of 4.03%, whereas P3HT:Qx1b achieved a Voc of 0.95 V and...
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