TITLE

Determination of the minority carrier diffusion length in compositionally graded Cu(In,Ga)Se2 solar cells using electron beam induced current

AUTHOR(S)
Brown, Gregory; Faifer, Vladimir; Pudov, Alex; Anikeev, Sergey; Bykov, Eugene; Contreras, Miguel; Junqiao Wu
PUB. DATE
January 2010
SOURCE
Applied Physics Letters;1/11/2010, Vol. 96 Issue 2, p022104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A method is proposed and tested which allows for the accurate determination of the carrier collection efficiency and minority carrier diffusion length in Cu(In,Ga)Se2 solar cells using energy dependent electron beam induced current. Gallium composition gradients across the film thickness introduce quasielectric fields that are found to improve collection efficiency when they are located toward the rear of the sample. The quasielectric fields are also shown to reduce the influence of back surface recombination. The strengths and limitations of this technique are discussed and compared with external quantum efficiency measurements.
ACCESSION #
47587945

 

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