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.
| Original language | English |
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| Pages (from-to) | 15687-15694 |
| Number of pages | 8 |
| Journal | Journal of Materials Chemistry A |
| Volume | 8 |
| Issue number | 31 |
| DOIs | |
| Publication status | Published - 21 Jul 2020 |