17.25% high efficiency ternary solar cells with increased open-circuit voltage using a high HOMO level small molecule guest donor in a PM6:Y6 blend
Journal article, 2021
A small molecule donor TiC12 with an asymmetric thieno[3,2-c]isochromene unit is incorporated into the PM6:Y6 system as the third component for constructing ternary organic solar cells (OSCs). It was found that TiC12 played an outstanding role in improvement of open-circuit voltage (V-oc), short-circuit current (J(sc)) and fill factor (FF) for the OSCs. The effects of TiC12 on the absorption, exciton dissociation, charge extraction, bimolecular recombination and morphology of the active layer are analyzed in detail. The synergetic improvement of J(sc), V-oc and FF parameters is realized to generate an advanced power conversion efficiency (PCE) of 17.25% in the optimized PM6 : TiC12 : Y6 (0.9 : 0.1 : 1.2) ternary device. Furthermore, the V-oc is increased in proportion to the added amount of TiC12 in the ternary devices due to reduced disorder and nonradiative energy loss, although the guest donor TiC12 exhibited a higher HOMO level than PM6. This study provides an effective and innovative approach to elevate V-oc and thus PCE for ternary OSCs by introducing a guest small molecule donor with a higher HOMO level and better miscibility with the acceptor.
Author
Wei Tang
Changzhou University
Xiangtan University
Wenhong Peng
Hunan Institute of Engineering
Changzhou University
Mengbing Zhu
Changzhou University
Huanxiang Jiang
Jianghan University
Wenchao Wang
Changzhou University
Hao Xia
Changzhou University
Renqiang Yang
Jianghan University
Olle Inganas
Linköping University
Hua Tan
Changzhou University
Qingzhen Bian
Linköping University
Ergang Wang
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Weiguo Zhu
Xiangtan University
Changzhou University
Journal of Materials Chemistry A
2050-7488 (ISSN) 2050-7496 (eISSN)
Vol. 9 36 20493-20501Subject Categories
Other Physics Topics
Other Chemistry Topics
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1039/d1ta05284e