Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 16, Issue 6, Pages 1801-1806Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2010.2049479
Keywords
Bulk-heterojunctions; charge-transfer (CT) complexes; magnetic field effects; organic solar cells
Categories
Funding
- Sustainable Energy Education and Research Center
- Center for Materials Processing at the University of Tennessee
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1102011] Funding Source: National Science Foundation
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In this paper, we use magnetic field effects of photocurrent (MFEPC) to study the photovoltaic processes in pristine conjugated polymer, bulk heterojunction, and double-layer solar cells, respectively, based on poly(3-alkylthiophene) (P3HT). The MFEPC reveals that the photocurrent generation undergoes the dissociation in polaron pair states and the charge reaction in excitonic states in pristine conjugated polymers. As for the bulk-heterojunction solar cells consisting of electron donor P3HT and electron acceptor [6,6]-phenyl C61-butyric acid methyl ester (PCBM), the MFEPC indicates that the dissociated electrons and holes inevitably form the intermolecular charge-transfer (CT) complexes at donor and acceptor interfaces. Essentially, the photocurrent generation relies on the further dissociation of intermolecular CT complexes. Moreover, we use double-layer solar cell to further study the intermolecular CT complexes with well-controlled donor-acceptor interfaces based on double-layer P3HT/TiOx design. We find that the increase in free energies can significantly reduce the density of CT complexes upon thermal annealing.
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