NDLI: Optimal bandgap combinations — Does material quality matter?

Content Provider	IEEE Xplore Digital Library
Author	Chan, N.L.A. Ekins-Daukes, N.J. Brindley, H.E.
Copyright Year	2011
Description	Author affiliation: Department of Physics, Imperial College London, London, United Kingdom (Chan, N.L.A.; Ekins-Daukes, N.J.; Brindley, H.E.)
Abstract	The balance of photogeneration and recombination gives rise to an optimum band-gap for any solar cell. The radiative limit represents the lowest permissible level of recombination in a solar cell and therefore places an upper limit on the voltage that can be attained. Introducing additional, non-radiative recombination results in a loss in voltage that can only be compensated for by moving to higher band-gaps. Consequently the optimal band-gap for solar energy conversion will rise with increasing non-radiative recombination rate. This balance was recognized by Shockley and Queisser for single junction solar cells and is here extended to multi-junction solar cells. A rise in optimal band-gaps has been observed in simulated single, double and triple junction devices as non-radiative recombination increases. Optimal band gaps between excellent poor diode ‘quality’ devices are shown to differ by 100s of meV under 1-Sun AM0 illumination, but exhibit no significant change under a 500-Sun AM1.5D spectrum.
Starting Page	002537
Ending Page	002537
File Size	533989
Page Count	1
File Format	PDF
ISBN	9781424499663
ISSN	01608371
e-ISBN	9781424499656
DOI	10.1109/PVSC.2011.6186463
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photonic band gap Photovoltaic cells Junctions IEEE Xplore Materials Physics Solar power generation
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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