Magnetic studies of photovoltaic processes in organic solar cells

Huidong Zang; Ilia N. Ivanov; Bin Hu

doi:10.1109/JSTQE.2010.2049479

Magnetic studies of photovoltaic processes in organic solar cells

Huidong Zang, Ilia N. Ivanov, Bin Hu

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

In this paper, we use magnetic field effects of photocurrent (MFE _PC) to study the photovoltaic processes in pristine conjugated polymer, bulk heterojunction, and double-layer solar cells, respectively, based on poly(3-alkylthiophene) (P3HT). The MFE_PC 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 MFE _PC 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 donoracceptor 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.

Original language	English
Article number	5491036
Pages (from-to)	1801-1806
Number of pages	6
Journal	IEEE Journal of Selected Topics in Quantum Electronics
Volume	16
Issue number	6
DOIs	https://doi.org/10.1109/JSTQE.2010.2049479
State	Published - Nov 2010

Funding

Manuscript received February 16, 2010; revised April 7, 2010; accepted April 23, 2010. Date of publication June 21, 2010; date of current version December 3, 2010. This work was supported by the Sustainable Energy Education and Research Center and the Center for Materials Processing at the University of Tennessee. This research was partially conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Division of Scientific User Facilities, U.S. Department of Energy.

Keywords

Bulk-heterojunctions
charge-transfer (CT) complexes
magnetic field effects
organic solar cells

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/JSTQE.2010.2049479

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title = "Magnetic studies of photovoltaic processes in organic solar cells",

abstract = "In this paper, we use magnetic field effects of photocurrent (MFE PC) 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 MFE PC 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 donoracceptor 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.",

keywords = "Bulk-heterojunctions, charge-transfer (CT) complexes, magnetic field effects, organic solar cells",

author = "Huidong Zang and Ivanov, {Ilia N.} and Bin Hu",

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AB - In this paper, we use magnetic field effects of photocurrent (MFE PC) 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 MFE PC 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 donoracceptor 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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Magnetic studies of photovoltaic processes in organic solar cells

Abstract

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Keywords

UN SDGs

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