NDLI: Towards new design rules for indoor photovoltaic cells

Content Provider	IEEE Xplore Digital Library
Author	Ruhle, K. Glunz, S.W. Kasemann, M.
Copyright Year	2012
Description	Author affiliation: Fraunhofer Institute for Solar Energy Systems ISE, 79110 Freiburg, Germany (Glunz, S.W.) \|\| University of Freiburg, Department of Microsystems Engineering, 79110, Germany (Ruhle, K.; Kasemann, M.)
Abstract	The common design rules for outdoor solar cells do not apply necessarily for indoor photovoltaic cells due to differences in spectra and intensities. Since no general standard for indoor conditions is currently available, the first aim of this paper is to present a statistical approach encompassing the diversity of available intensities and spectra which shall enable a systematic derivation of a standard for indoor conditions. In a second step, the influences of injection-and spectra-dependent parameters on cell efficiencies are studied with the focus on indoor conditions. It is shown that the parallel resistance has to be increased above 50 $kΩcm^{2}$ in order to achieve an efficiency above 10% at intensities below $10^{−3}$ $W/cm^{2}$ (∼0.01 suns). The influence of the series resistance is negligible in this intensity range, allowing values in the order of 10 $Ωcm^{2}$ without appreciable efficiency reduction. This gives room for wider design variations with respect to base and emitter doping, optimization of bulk-, surface- and emitter recombination, contact optimization and back contact cell designs. The combined evaluation of possible photovoltaic cell parameters show that efficiencies of more than 10% at intensities as low as $10^{−4}$ $W/cm^{2}$ are accessible.
Starting Page	002588
Ending Page	002591
File Size	745883
Page Count	4
File Format	PDF
ISBN	9781467300643
ISSN	01608371
e-ISBN	9781467300667
DOI	10.1109/PVSC.2012.6318124
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photovoltaic cells Doping Resistance Sea measurements Standards Sun Wavelength measurement micro energy harvesting cell efficiency indoor conditions indoor photovoltaic cells
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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