Long-range Exciton Diffusion in Non-Fullerene Acceptors and Coarse Bulk Heterojunctions Enable Highly Efficient Organic Photovoltaics
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.
|Authors||Sajjad, T. M.|
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.
|Journal||Journal of Materials Chemistry A|
|Publisher||Royal Society of Chemistry (RSC)|
|Digital Object Identifier (DOI)||doi:10.1039/D0TA06017H|
|21 Jul 2020|
|Publication process dates|
|Accepted||21 Jul 2020|
|Deposited||27 Jul 2020|
|Accepted author manuscript|
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