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Ternary Organic Solar Cell with a Near‐Infrared Absorbing Selenophene–Diketopyrrolopyrrole‐Based Nonfullerene Acceptor and an Efficiency above 10%
Author(s) -
Privado María,
Malhotra Prateek,
de la Cruz Pilar,
Singhal Rahul,
Cerdá Jesús,
Aragó Juan,
Ortí Enrique,
Sharma Ganesh D.,
Langa Fernando
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900471
Subject(s) - organic solar cell , thiophene , acceptor , ternary operation , materials science , rhodanine , solar cell , band gap , energy conversion efficiency , optoelectronics , photochemistry , chemistry , organic chemistry , polymer , physics , computer science , composite material , programming language , condensed matter physics
A new near‐IR absorbing nonfullerene acceptor (NFA), MPU4, is synthesized in three steps from an accessible selenophene–diketopyrrolopyrrole and rhodanine. The high planarity of the molecule and the extended conjugation determine that the new NFA presents a high optical absorption coefficient and a narrow bandgap. In thin films, MPU4 shows broad absorption in the visible and near‐IR regions from 550 to 930 nm. When blended with a phenothiazine‐based small‐molecule (SM) donor, SM1, the resulting additive‐free binary organic solar cell (OSC) exhibits an efficiency of 8.96% with a high open‐circuit voltage ( V oc ) of 0.99 V and a short‐circuit current ( J sc ) of 14.91 mA cm −2 with a remarkably low energy loss ( E loss ) of 0.42 eV. This efficiency is significantly higher (24%) than that achieved with an analogous device with a thiophene‐containing NFA (MPU1, 7.22%) instead of MPU4. Importantly, ternary solar cells prepared with SM1 as the donor and MPU4 and PC 71 BM as acceptors afford, after solvent vapor annealing, an efficiency of 10.04% with a V oc of 0.92 V, J sc of 16.32 mA cm −2 , fill factor of 0.67, and E loss of 0.49 eV. These results demonstrate the advantages of using selenophene instead of thiophene in SM OSCs.