In:
Solar RRL, Wiley, Vol. 4, No. 1 ( 2020-01)
Abstract:
An effective way to improve the power conversion efficiency of organic solar cells (OSCs) is to use the ternary architecture consisting of a donor, an acceptor, and a third component. Identifying the proper third component for successful ternary OSCs, however, is not an easy task. Herein, it is demonstrated that a middle‐bandgap acceptor, ITC‐2Cl, functions as a successful third component for several wide‐bandgap donor: ultranarrow bandgap acceptor binary systems (PBDB‐T‐2F: F8IC, PBDB‐T‐2F: IOIC‐2Cl, and PBDB‐T‐2Cl: IOIC‐2Cl). Photovoltaic parameters, including V OC , J SC , fill factor (FF), and power conversion efficiency (PCE), are effectively improved by incorporating ITC‐2Cl, which lies in the complementary absorption of ITC‐2Cl and host binary system, high‐lying LUMO level of ITC‐2Cl, and the inhibition of bimolecular recombination. The ternary device based on PBDB‐T‐2Cl: ITC‐2Cl: IOIC‐2Cl achieves a champion PCE of 14.75% (certified as 13.78%) with a very low energy loss of 0.48 eV. These results provide critical insight into the ternary strategy and encourage re‐evaluation and restudy of the photoactive materials previously reported with moderate performance.
Type of Medium:
Online Resource
ISSN:
2367-198X
,
2367-198X
DOI:
10.1002/solr.201900377
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
2882014-9
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