Organic photovoltaic cells based on continuously graded donor-acceptor heterojunctions

Richa Pandey; Russell J. Holmes

doi:10.1109/JSTQE.2010.2049256

Organic photovoltaic cells based on continuously graded donor-acceptor heterojunctions

Richa Pandey, Russell J. Holmes

Chemical Engineering and Materials Science

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

14 Scopus citations

Abstract

We demonstrate enhanced organic photovoltaic cell (OPV) efficiency through the use of continuously graded donoracceptor (DA) heterojunctions. Device performance is a strong function of both DA grading and overall composition ratio. The use of a tunable gradient permits an increase in the DA interface area for high-exciton diffusion efficiency relative to a planar heterojunction, while also improving the charge collection efficiency relative to a uniform mixture. Using the archetypical DA pair of copper phthalocyanine and C ₆₀, a power conversion efficiency of η_P = (2.1 \pm 0.1) is realized under 100 mW/cm² simulated AM1.5G solar illumination for a graded heterojunction. This represents an improvement in η_P of 60 relative to a planar heterojunction OPV and 20 compared to a uniformly mixed heterojunction OPV.

Original language	English (US)
Article number	5491035
Pages (from-to)	1537-1543
Number of pages	7
Journal	IEEE Journal on Selected Topics in Quantum Electronics
Volume	16
Issue number	6
DOIs	https://doi.org/10.1109/JSTQE.2010.2049256
State	Published - Nov 2010

Bibliographical note

Funding Information:
Manuscript received February 3, 2010; revised April 1, 2010; accepted April 19, 2010. Date of publication June 21, 2010; date of current version December 3, 2010. This work was supported in part by the National Science Foundation (NSF) under Award CBET-0946723 and in part by the NSF Materials Research Science and Engineering Centers Program under Awards DMR-0212302 and DMR-0819885. The work of R. J. Holmes was supported in part by 3M Company under a Non-Tenured Faculty Grant.

Keywords

Excitons
molecular electronics
organic compounds
photovoltaic cells
semiconductor heterojunctions

UN SDGs

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

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title = "Organic photovoltaic cells based on continuously graded donor-acceptor heterojunctions",

abstract = "We demonstrate enhanced organic photovoltaic cell (OPV) efficiency through the use of continuously graded donoracceptor (DA) heterojunctions. Device performance is a strong function of both DA grading and overall composition ratio. The use of a tunable gradient permits an increase in the DA interface area for high-exciton diffusion efficiency relative to a planar heterojunction, while also improving the charge collection efficiency relative to a uniform mixture. Using the archetypical DA pair of copper phthalocyanine and C 60, a power conversion efficiency of ηP = (2.1 \pm 0.1) is realized under 100 mW/cm2 simulated AM1.5G solar illumination for a graded heterojunction. This represents an improvement in ηP of 60 relative to a planar heterojunction OPV and 20 compared to a uniformly mixed heterojunction OPV.",

keywords = "Excitons, molecular electronics, organic compounds, photovoltaic cells, semiconductor heterojunctions",

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note = "Funding Information: Manuscript received February 3, 2010; revised April 1, 2010; accepted April 19, 2010. Date of publication June 21, 2010; date of current version December 3, 2010. This work was supported in part by the National Science Foundation (NSF) under Award CBET-0946723 and in part by the NSF Materials Research Science and Engineering Centers Program under Awards DMR-0212302 and DMR-0819885. The work of R. J. Holmes was supported in part by 3M Company under a Non-Tenured Faculty Grant.",

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N2 - We demonstrate enhanced organic photovoltaic cell (OPV) efficiency through the use of continuously graded donoracceptor (DA) heterojunctions. Device performance is a strong function of both DA grading and overall composition ratio. The use of a tunable gradient permits an increase in the DA interface area for high-exciton diffusion efficiency relative to a planar heterojunction, while also improving the charge collection efficiency relative to a uniform mixture. Using the archetypical DA pair of copper phthalocyanine and C 60, a power conversion efficiency of ηP = (2.1 \pm 0.1) is realized under 100 mW/cm2 simulated AM1.5G solar illumination for a graded heterojunction. This represents an improvement in ηP of 60 relative to a planar heterojunction OPV and 20 compared to a uniformly mixed heterojunction OPV.

AB - We demonstrate enhanced organic photovoltaic cell (OPV) efficiency through the use of continuously graded donoracceptor (DA) heterojunctions. Device performance is a strong function of both DA grading and overall composition ratio. The use of a tunable gradient permits an increase in the DA interface area for high-exciton diffusion efficiency relative to a planar heterojunction, while also improving the charge collection efficiency relative to a uniform mixture. Using the archetypical DA pair of copper phthalocyanine and C 60, a power conversion efficiency of ηP = (2.1 \pm 0.1) is realized under 100 mW/cm2 simulated AM1.5G solar illumination for a graded heterojunction. This represents an improvement in ηP of 60 relative to a planar heterojunction OPV and 20 compared to a uniformly mixed heterojunction OPV.

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KW - molecular electronics

KW - organic compounds

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KW - semiconductor heterojunctions

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Organic photovoltaic cells based on continuously graded donor-acceptor heterojunctions

Abstract

Bibliographical note

Keywords

UN SDGs

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