Observing Charge Separation Distance in Organic Donor-Acceptors with Photoinduced Absorption Detected Magnetic Resonance Spectroscopy
Conference
·
OSTI ID:1994502
The debatable role of charge transfer states in photoinduced charge separation to useful free carriers has been a long-standing controversy in the field of organic solar cells. In this work, varying charge-pair distances are measured in sensitized donor-acceptor thin films using a photoinduced absorption-detected magnetic resonance (PADMR) technique where nearest-neighbor charge transfer states are identified by their strong magnetic dipole-coupling relative to more distant charges. Correlation with the direct measurement of free carriers using time-resolved microwave conductivity has corroborated a distributed-range electron transfer model in which charges generated at longer distances become free carriers, while shorter transfer distances give only bound charge transfer states that cannot separate to generate photocurrent.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
- DOE Contract Number:
- AC36-08GO28308;
- OSTI ID:
- 1994502
- Report Number(s):
- NREL/PO-5900-86124; MainId:86897; UUID:29e49871-3a00-41a4-aa2a-f410b7280d2c; MainAdminID:70152
- Conference Information:
- Presented at Fpi-15, 17-21 June 2023, Raleigh, North Carolina
- Country of Publication:
- United States
- Language:
- English
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