Below-gap excitation of ∏-conjugated polymer-fullerene blends: implications for bulk organic heterojunction solar cells

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Publication Type Journal Article
School or College College of Science
Department Physics
Creator Vardeny, Zeev Valentine
Other Author Drori, T.; Sheng, C.-X.; Ndobe, A.; Singh, S.; Holt, J.
Title Below-gap excitation of ∏-conjugated polymer-fullerene blends: implications for bulk organic heterojunction solar cells
Date 2008-07
Description We used a variety of optoelectronic techniques such as broadband fs transient and cw photomodulation spectroscopies, electroabsorption, and short-circuit photocurrent in bulk heterojunctions organic solar cells for studying the photophysics in ∏-conjugated polymer-fullerene blends with below-gap excitation. In contrast to the traditional view, we found that below-gap excitation, which is incapable of generating intrachain excitons, nevertheless efficiently generates polarons on the polymer chains and fullerene molecules. The polaron action spectrum extends deep inside the gap as a result of a charge-transfer complex state formed between the polymer chain and fullerene molecule. With appropriate design engineering the long-lived polarons might be harvested in solar cell devices.
Type Text
Publisher American Physical Society
Journal Title Physical Review Letters
Volume 101
Issue 3
First Page 37401
Last Page 37401
DOI 10.1103/PhysRevLett.101.037401
citatation_issn 0031-9007
Subject pi-conjugated polymers; Fullerene blends; Below-gap excitations; Bulk heterojunctions; Bulk organic heterojunction solar cells; Photophysics
Subject LCSH Energy gap (Physics); Conjugated polymers -- Optical properties; Fullerenes -- Optical properties; Heterojunctions
Language eng
Bibliographic Citation Drori, T., Sheng, C.-X., Ndobe, A., Singh, S., Holt, J., & Vardeny, Z. V. (2008). Below-gap excitation of ∏-conjugated polymer-fullerene blends: implications for bulk organic heterojunction solar cells. Physical Review Letters, 101(3), 037401-1-4.
Rights Management (c) American Physical Society http://dx.doi.org/10.1103/PhysRevLett.101.037401
Format Medium application/pdf
Format Extent 665,351 bytes
Identifier ir-main,10118
ARK ark:/87278/s6ws9bkp
Setname ir_uspace
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Reference URL https://collections.lib.utah.edu/ark:/87278/s6ws9bkp