Design of ultra-high luminescent polymers for organic photovoltaic cells with low energy loss

Jingwen Wang; Lijiao Ma; Young Woong Lee; Huifeng Yao; Ye Xu; Shaoqing Zhang; Han Young Woo; Jianhui Hou

doi:10.1039/d1cc02706a

Design of ultra-high luminescent polymers for organic photovoltaic cells with low energy loss

Chem Commun (Camb). 2021 Sep 9;57(72):9132-9135. doi: 10.1039/d1cc02706a.

Authors

Jingwen Wang^{1

2}, Lijiao Ma^{1

2}, Young Woong Lee³, Huifeng Yao^{1

4}, Ye Xu^{1

2}, Shaoqing Zhang⁴, Han Young Woo³, Jianhui Hou^{1

2}

Affiliations

¹ State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular, Sciences CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing 100190, P. R. China. [email protected].
² University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
³ Department of Chemistry, Korea University, Seoul 136-713, Republic of Korea. [email protected].
⁴ School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China.

PMID: 34498626
DOI: 10.1039/d1cc02706a

Abstract

Here, new polymers named PBTT-Cn (n = 3, 4, or 5) have been designed based on carboxylate-functionalized thieno[3,2-b]thiophene units. The electroluminescence external quantum efficiencies (EQE_EL) of pristine PBTT-C4 and C5 films are over 1 × 10^-2, which are among the highest results for OPV materials. Through combination with BTP-eC9, the PBTT-C4-based film showed a high EQE_EL of 6 × 10^-4 and the Vnon-radloss is 0.19 eV. As a result, a high open-circuit voltage of 0.89 V and a satisfactory PCE of 15% were recorded in the PBTT-C4-based OPV cells.