Activationless Charge Transfer Drives Photocurrent Generation in Organic Photovoltaic Blends Independent of Energetic Offset
Yifan Dong, Rui Zheng, Deping Qian, Tack Ho Lee, Helen L Bristow, Pabitra Shakya Tuladhar, Hyojung Cha, James R Durrant · 2024
Read Activationless Charge Transfer Drives Photocurrent Generation in Organic Photovoltaic Blends Independent of Energetic Offset by Yifan Dong, Rui Zheng, Deping Qian, Tack Ho Lee, Helen L Bristow, Pabitra Shakya Tuladhar, Hyojung Cha, James R Durrant (2024) in the Tower of Babel, a free online library of public-domain works preserved in clean, searchable text. No sign-up. The full text is served as a plain-text file at a predictable URL, where text is present: https://antarctic-labs.com/tower-of-babel/pmc-11638955.txt.
Description
Dong and co-authors measured how much energy it takes to split charges in organic solar cell blends. They found the answer barely depends on the energy offset between materials. Recent progress in these cells came from new acceptor molecules that work with smaller offsets. This challenged the old picture that a large offset is needed to drive charge separation. Using temperature-based ultrafast spectroscopy on several blends, the team measured activation energies for charge generation and recombination.
Charge generation needed almost no activation, between 11 and 21 millielectronvolts, whatever the offset. Early recombination also needed almost none. Later recombination between free charges was strongly temperature-dependent. The authors conclude that generation here does not follow classic Marcus theory. Instead it behaves like an adiabatic process carried by still-hot charges.
Catalog record
| CREATOR | Yifan Dong, Rui Zheng, Deping Qian, Tack Ho Lee, Helen L Bristow, Pabitra Shakya Tuladhar, Hyojung Cha, James R Durrant |
|---|---|
| YEAR | 2024 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 26 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |