Semitransparent organic solar cells with organic wavelength dependent reflectors

Y. Galagan, M.G. Debije, P.W.M. Blom

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Abstract

Semitransparent organic solar cells employing solution-processable organic wavelength dependent reflectors of chiral nematic (cholesteric) liquid crystals are demonstrated. The cholesteric liquid crystal (CLC) reflects only in a narrow band of the solar spectrum and remains transparent for the remaining wavelengths. The reflective band is matched to the absorption spectrum of the organic solar cell such that only unabsorbed photons that can contribute to the photocurrent are reflected to pass through the active layer a second time. In this way, the efficiency of semitransparent organic solar cells can be enhanced without significant transparency losses. An efficiency increase of 6% was observed when a CLC reflector with a reflection band of 540–620 nm was used, whereas the transparency of the organic solar cells is only suppressed in the 80 nm narrow bandwidth.
Original languageEnglish
Article number043302
Pages (from-to)043302-1/3
Number of pages3
JournalApplied Physics Letters
Volume98
Issue number4
DOIs
Publication statusPublished - 2011

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reflectors
solar cells
liquid crystals
wavelengths
solar spectra
photocurrents
narrowband
bandwidth
absorption spectra
photons

Cite this

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title = "Semitransparent organic solar cells with organic wavelength dependent reflectors",
abstract = "Semitransparent organic solar cells employing solution-processable organic wavelength dependent reflectors of chiral nematic (cholesteric) liquid crystals are demonstrated. The cholesteric liquid crystal (CLC) reflects only in a narrow band of the solar spectrum and remains transparent for the remaining wavelengths. The reflective band is matched to the absorption spectrum of the organic solar cell such that only unabsorbed photons that can contribute to the photocurrent are reflected to pass through the active layer a second time. In this way, the efficiency of semitransparent organic solar cells can be enhanced without significant transparency losses. An efficiency increase of 6{\%} was observed when a CLC reflector with a reflection band of 540–620 nm was used, whereas the transparency of the organic solar cells is only suppressed in the 80 nm narrow bandwidth.",
author = "Y. Galagan and M.G. Debije and P.W.M. Blom",
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Semitransparent organic solar cells with organic wavelength dependent reflectors. / Galagan, Y.; Debije, M.G.; Blom, P.W.M.

In: Applied Physics Letters, Vol. 98, No. 4, 043302, 2011, p. 043302-1/3.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Semitransparent organic solar cells with organic wavelength dependent reflectors

AU - Galagan, Y.

AU - Debije, M.G.

AU - Blom, P.W.M.

PY - 2011

Y1 - 2011

N2 - Semitransparent organic solar cells employing solution-processable organic wavelength dependent reflectors of chiral nematic (cholesteric) liquid crystals are demonstrated. The cholesteric liquid crystal (CLC) reflects only in a narrow band of the solar spectrum and remains transparent for the remaining wavelengths. The reflective band is matched to the absorption spectrum of the organic solar cell such that only unabsorbed photons that can contribute to the photocurrent are reflected to pass through the active layer a second time. In this way, the efficiency of semitransparent organic solar cells can be enhanced without significant transparency losses. An efficiency increase of 6% was observed when a CLC reflector with a reflection band of 540–620 nm was used, whereas the transparency of the organic solar cells is only suppressed in the 80 nm narrow bandwidth.

AB - Semitransparent organic solar cells employing solution-processable organic wavelength dependent reflectors of chiral nematic (cholesteric) liquid crystals are demonstrated. The cholesteric liquid crystal (CLC) reflects only in a narrow band of the solar spectrum and remains transparent for the remaining wavelengths. The reflective band is matched to the absorption spectrum of the organic solar cell such that only unabsorbed photons that can contribute to the photocurrent are reflected to pass through the active layer a second time. In this way, the efficiency of semitransparent organic solar cells can be enhanced without significant transparency losses. An efficiency increase of 6% was observed when a CLC reflector with a reflection band of 540–620 nm was used, whereas the transparency of the organic solar cells is only suppressed in the 80 nm narrow bandwidth.

U2 - doi:10.1063/1.3546171

DO - doi:10.1063/1.3546171

M3 - Article

VL - 98

SP - 043302-1/3

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 4

M1 - 043302

ER -