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
| Authors | Sajjad, 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. |
| Year | 2020 |
| Journal | Journal of Materials Chemistry A |
| Publisher | Royal Society of Chemistry (RSC) |
| ISSN | 2050-7488 |
| Digital Object Identifier (DOI) | https://doi.org/10.1039/D0TA06017H |
| Publication dates | |
| 21 Jul 2020 | |
| Publication process dates | |
| Accepted | 21 Jul 2020 |
| Deposited | 27 Jul 2020 |
| Accepted author manuscript | License File Access Level Open |
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