Synthesis and Photovoltaic Properties of Non-fullerene Solution Processable Small Molecule Acceptors |
| |
Authors: | LI Hui LIU Zhao-yang ZHANG Xiao-yu YAO Shi-yu WEN Shan-peng TIAN Wen-jing |
| |
Affiliation: | State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, P. R. China |
| |
Abstract: | Two non-fullerene small molecules, BT-C6 and BT-C12, based on the vinylene-linked benzothiadiazole- thiophene(BT) moiety flanked with 2-(3,5,5-trimethylcyclohex-2-en-1-ylidene)malononitrile have been synthesized and characterized by solution/thin film UV-Vis absorption, photoluminescence(PL), and cyclic voltammetry(CV) measurements. The two molecules show intense absorption bands in a wide range from 300 nm to 700 nm and low optical bandgaps for BT-C6(1.60 eV) and for BT-C12(1.67 eV). The lowest unoccupied molecular orbital(LUMO) levels of both the molecules are relatively higher than that of [6,6]-phenyl C61 butyric acid methyl ester(PCBM), promising high open circuit voltage(Voc) for photovoltaic application. Bulk heterojunction(BHJ) solar cells with poly(3-hexylthiophene) (P3HT) as the electron donor and the two molecules as the acceptors were fabricated. Under 100 mW/cm2 AM 1.5 G illumination, the devices based on P3HT:BT-C6(1:1, mass ratio) show a power conversion efficiency(PCE) of 0.67%, a short-circuit current(Jsc) of 1.63 mA/cm2, an open circuit voltage(Voc) of 0.74 V, and a fill factor(FF) of 0.56. |
| |
Keywords: | Non-fullerene small molecule Electron acceptor Bulk heterojunction |
|
| 点击此处可从《高等学校化学研究》浏览原始摘要信息 |
|
点击此处可从《高等学校化学研究》下载全文 |
|