Long-range Exciton Diffusion in Non-Fullerene Acceptors and Coarse Bulk Heterojunctions Enable Highly Efficient Organic Photovoltaics

Journal article

Sajjad, T. M. (2020). Long-range Exciton Diffusion in Non-Fullerene Acceptors and Coarse Bulk Heterojunctions Enable Highly Efficient Organic Photovoltaics. Journal of Materials Chemistry A. https://doi.org/10.1039/D0TA06017H
AuthorsSajjad, T. M.
Abstract

We investigated singlet exciton diffusion in three ITIC derivatives used as electron acceptors in organic photovoltaics (OPVs) by time-resolved photoluminescence volume quenching and exciton-exciton annihilation. The exciton diffusion coefficient was found to be in the range of 0.003-0.007 cm2s-1 which leads to a three-dimensional exciton diffusion length of up to 31 nm. We fabricated solar cells using bulk heterojunctions of these acceptors with the electron donor PTB7-Th which showed ~7% efficiency and large scale phase separation. Our results show that long range exciton diffusion and large domains offer significant advantages for OPVs.

Year2020
JournalJournal of Materials Chemistry A
PublisherRoyal Society of Chemistry (RSC)
ISSN2050-7488
Digital Object Identifier (DOI)https://doi.org/10.1039/D0TA06017H
Publication dates
Print21 Jul 2020
Publication process dates
Accepted21 Jul 2020
Deposited27 Jul 2020
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