Graded band gap CIGS solar cells considering the valence band widening

CIGS thin film solar cells with Valence Band (VB) and Conduction Band (CB) grading in the space charge region and back surface region of the absorber layer are proposed in this paper. In all the examined profiles the VB widening effects on the performance parameters by promoting the carrier transfor...

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Bibliographic Details
Published in2012 38th IEEE Photovoltaic Specialists Conference pp. 000906 - 000908
Main Authors Gorji, Nima E., Reggiani, U., Sandrolini, L.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2012
Subjects
band gap grading
charge transfer
CIGS solar cells
Gallium
Passivation
Performance evaluation
Photonic band gap
Photovoltaic cells
valence band widening
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Summary:CIGS thin film solar cells with Valence Band (VB) and Conduction Band (CB) grading in the space charge region and back surface region of the absorber layer are proposed in this paper. In all the examined profiles the VB widening effects on the performance parameters by promoting the carrier transformation, hole passivation and carrier collection in the cell are considered. On the basis of the results, an optimal graded band gap structure is proposed and considered with a design closer to the reality where the VB offset is created during the band gap grading processes.
ISBN:1467300640
9781467300643
ISSN:0160-8371
DOI:10.1109/PVSC.2012.6317749