用于高效有机太阳能电池且具有小电压损失的基于稠合硒吩-噻吩并[3,2-b]噻吩-硒吩（ST）的窄带隙电子受体。

Fused selenophene-thieno[3,2-b]thiophene-selenophene (ST)-based narrow-bandgap electron acceptor for efficient organic solar cells with small voltage loss.

作者信息

Liao Xunfan, Shi Xueliang, Zhang Ming, Gao Ke, Zuo Lijian, Liu Feng, Chen Yiwang, Jen Alex K-Y

机构信息

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China.

出版信息

Chem Commun (Camb). 2019 Jul 11;55(57):8258-8261. doi: 10.1039/c9cc03585k.

DOI:10.1039/c9cc03585k

PMID:31243399

Abstract

A novel near-infrared-light-absorbing fused-ring electron acceptor, STIC, was developed for organic solar cells. STIC exhibited a narrow bandgap with an absorption edge reaching 940 nm, which was ascribed to the strong electron-rich selenophene-thieno[3,2-b]thiophene-selenophene (ST) unit and strong intramolecular charge transfer of STIC. Also, STIC-based devices showed low open-circuit voltage (Voc) loss values, attributed to the rigid ST core providing low reorganization energy. The device based on the PBDB-T:STIC blend exhibited a power conversion efficiency (PCE) of 9.68% with a high short-circuit current density (Jsc) of 19.96 mA cm-2 and a low Voc loss of 0.55 eV.

摘要

一种用于有机太阳能电池的新型近红外光吸收稠环电子受体STIC被研发出来。STIC呈现出窄带隙，其吸收边缘达到940纳米，这归因于富电子的强硒吩-噻吩并[3,2-b]噻吩-硒吩（ST）单元以及STIC的强分子内电荷转移。此外，基于STIC的器件显示出低开路电压（Voc）损失值，这归因于刚性的ST核提供了低重组能。基于PBDB-T:STIC共混物的器件展现出9.68%的功率转换效率（PCE），具有19.96 mA cm-2的高短路电流密度（Jsc）以及0.55 eV的低Voc损失。