NDLI: Potential for light trapping in Cu(In,Ga)Se/sub 2/ solar cells

Content Provider	IEEE Xplore Digital Library
Author	Malmstrom, J. Lundberg, O. Stolt, L.
Copyright Year	2003
Description	Author affiliation: Angstrom Solar Center, Uppsala Univ., Sweden (Malmstrom, J.; Lundberg, O.; Stolt, L.)
Abstract	We have analyzed the potential for light trapping in Cu(In,Ga)Se/sub 2/ cells. Key quantities such as back contact reflectance and reflectance at the absorber-window interface are discussed and calculated from measured optical properties. Two model cases, perfectly specular interfaces and Lambertian scattering from the absorber front and back surfaces, are compared in terms of integrated AM 1.5 absorption in the absorber as a function of absorber thickness d/sub a/ for Ag, TiN, Mo back reflectors. Relative to the Mo reflector in the specular model, the potential gain of an Ag reflector at d/sub a/ = 0.5 /spl mu/m is estimated to 2.0 and 3.5 mA/cm/sup 2/ in the specular and scattering cases, respectively. Improved long wavelength quantum efficiency is experimentally demonstrated with a TiN back reflector. The resulting gain in J/sub sc/ is 0.8 mA/cm/sup 2/ at 0.45 /spl mu/m absorber thickness, in accordance with our model results.
Starting Page	344
Ending Page	347
File Size	300472
Page Count	4
File Format	PDF
ISBN	4990181603
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-11
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	PVSEC Advisory Committee
Subject Keyword	Photovoltaic cells Absorption Reflectivity Optical scattering Optical refraction Optical variables control Light scattering Mathematical model Crystalline materials Amorphous silicon
Content Type	Text
Resource Type	Article

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