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Title: Dependence of Polymer Hybrid Photovoltaic Performance on Donor-Acceptor Morphology

Abstract

In this paper, we present our experimental and numerical studies on polymer-polymer and polymer-inorganic hybrid photovoltaic cells as the donor-acceptor morphology evolves from sharply defined layers, to partial blends and finally homogeneous blends. Results are compared for polyphenylene-vinylene (PPV) polymer donors and a variety of electron accepting materials, including CN-ether PPV, PCBM, and titanium dioxide. We show that optimal device performance is achieved by combining blended and layered structures and by tuning exciton generation rate position by controlling thickness.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
943993
DOE Contract Number:
AC36-99-GO10337
Resource Type:
Conference
Resource Relation:
Conference: [Proceedings] 2006 IEEE 4th World Conference on Photovoltaic Energy Conversion (WCPEC-4), 7-12 May 2006, Waikoloa, Hawaii
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; ELECTRONS; ENERGY CONVERSION; EXCITONS; MORPHOLOGY; PERFORMANCE; PHOTOVOLTAIC CELLS; POLYMERS; THICKNESS; TITANIUM; TUNING; Basic Sciences

Citation Formats

Carter, S., Chasteen, S., Haerter, J., Sholim, V., Rumbles, G., and Scott, J. C. Dependence of Polymer Hybrid Photovoltaic Performance on Donor-Acceptor Morphology. United States: N. p., 2006. Web.
Carter, S., Chasteen, S., Haerter, J., Sholim, V., Rumbles, G., & Scott, J. C. Dependence of Polymer Hybrid Photovoltaic Performance on Donor-Acceptor Morphology. United States.
Carter, S., Chasteen, S., Haerter, J., Sholim, V., Rumbles, G., and Scott, J. C. Sun . "Dependence of Polymer Hybrid Photovoltaic Performance on Donor-Acceptor Morphology". United States. doi:.
@article{osti_943993,
title = {Dependence of Polymer Hybrid Photovoltaic Performance on Donor-Acceptor Morphology},
author = {Carter, S. and Chasteen, S. and Haerter, J. and Sholim, V. and Rumbles, G. and Scott, J. C.},
abstractNote = {In this paper, we present our experimental and numerical studies on polymer-polymer and polymer-inorganic hybrid photovoltaic cells as the donor-acceptor morphology evolves from sharply defined layers, to partial blends and finally homogeneous blends. Results are compared for polyphenylene-vinylene (PPV) polymer donors and a variety of electron accepting materials, including CN-ether PPV, PCBM, and titanium dioxide. We show that optimal device performance is achieved by combining blended and layered structures and by tuning exciton generation rate position by controlling thickness.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

Conference:
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  • Bulk heterojunction photovoltaic devices based on blends of conjugated polymers and fullerenes have achieved efficiencies of 3.5% under AM1.5 illumination. This is a result of efficient exciton dissociation at donoracceptor interfaces. However, the intimate blending of the electron and hole transporting species leads to detrimental charge carrier recombination in the bulk of these devices. We are investigating a solution to this problem by fabricating nanostructured oxideconjugated polymer composite structures. Porous SnO2 films with pore diameters of~100 nm have been fabricated. Intercalation of polymers into the pores by adsorption from solution yielded structures with approximately 75% of the free volume filledmore » with polymer. The resulting composite structures are promising candidates for developing polymer-based solar cells with short carrier-to-electrode path lengths while retaining high optical absorption, thus leading to increased efficiencies. Additionally, a carboxylic acid fullerene derivative was shown to bind to the SnO2 surface, a necessary step in creating a nanostructured electron-accepting surface.« less
  • Abstract not provided.
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  • The carrier collection efficiency ({eta}{sub c}) and energy conversion efficiency ({eta}{sub e}) of polymer photovoltaic cells were improved by blending of the semiconducting polymer with C{sub 60} or its functionalized derivatives. Composite films of poly(2-methoxy-5-(2{prime}-ethyl-hexyloxy)-1,4-phenylene vinylene) (MEH-PPV) and fullerenes exhibit {eta}{sub c} of about 29 percent of electrons per photon and {eta}{sub e} of about 2.9 percent, efficiencies that are better by more than two orders of magnitude than those that have been achieved with devices made with pure MEH-PPV. The efficient charge separation results from photoinduced electron transfer from the MEH-PPV (as donor) to C{sub 60} (as acceptor); themore » high collection efficiency results from a bicontinuous network of internal donor-acceptor heterojunctions. 17 refs., 3 figs.« less
  • The photosensitivity of semiconducting polymers can be enhanced by blending donor and acceptor polymers to optimize photoinduced charge separation. We describe a novel phase-separated polymer blend (composite) made with poly[2-methoxy-5-(2{prime}-ethyl-hexyloxy)-1,4-phenylene vinylene], MEH-PPV, as donor and cyano-PPV, CN-PPV, as acceptor. The photoluminescence and electroluminescence of both component polymers are quenched in the blend, indicative of rapid and efficient separation of photogenerated electron-hole pairs with electrons on the acceptor and holes on the donor. Diodes made with such a composite semiconducting polymer as the photosensitive medium show promising photovoltaic characteristics with carrier collection efficiency of 5% electrons/photon and energy conversion efficiency ofmore » 0.9%, {similar_to}20 times larger than in diodes made with pure MEH-PPV and {similar_to}100 times larger than in diodes made with CN-PPV. The photosensitivity and the quantum yield increase with reverse bias voltage, to 0.3 A/W and 80% electrons/photon respectively at {minus}10 V, comparable to results obtained from photodiodes made with inorganic semiconductors. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.« less