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Separation of bulk diffusion length and rear surface recombination velocity in SR-LBIC mappings

 
: Isenberg, J.; Bartels, O.; Warta, W.

:
Fulltext urn:nbn:de:0011-b-825734 (306 KByte PDF)
MD5 Fingerprint: f8d697d41873e1a000fa120f218a4e88
Created on: 27.10.2012


IEEE Electron Devices Society:
29th IEEE Photovoltaic Specialists Conference 2002. Proceedings : May 20-24, 2002 Hyatt Regency New Orleans New Orleans, Louisiana
New York, NY: IEEE, 2002
ISBN: 0-7803-7471-1
pp.328-331
Photovoltaic Specialists Conference <29, 2002, New Orleans/La.>
English
Conference Paper, Electronic Publication
Fraunhofer ISE ()

Abstract
SR-LBIC measurements are an important tool for mapping effective diffusion lengths of processed solar cells. This paper investigates the extraction of bulk diffusion length and back surface recombination velocities from SR-LBIC data. Two models for fitting data are studied, one of which takes account for a physical model proposed by Basore (1993), the other one, Spiegel et al. (2000), is a simplification thereof. Simulations with varying noise levels show, that noise is a more severe problem for L/sub bulk/ and S/sub back/ mappings as compared to L/sub eff/ mappings, though it should be possible to generate L/sub bulk/ and S/sub back/ mappings, if the noise level is below approximately 3%. First results of SR-LBIC data analysed with this tool are presented showing the necessity of having at least one measurement at a wavelength that corresponds to a penetration depth around half of the cell thickness.

: http://publica.fraunhofer.de/documents/B-82573.html