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Ammonia free CdS buffer layerfor Cu(In,Ga)Se2 solar cells by chemical bath deposition
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
2013 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The buffer layer in Cu(In,Ga)Se2 solar cells can improve cell performance. In this work we make CdS buffer layer by chemical bath deposition (CBD) without ammonia. CBD without ammonia were sought out since ammonia is a volatile compound.

Different recipes for making CdS were tested; only one of the tested recipes actually produced something that is worth further investigating. This recipe used sodium citrate, an innocuous compound instead of ammonia. The best performance was 0.15 % off from the reference.This is almost as good as the used baseline process. However the worst almost completely killed the solar cells. Cell performance dropped by more than absolute 10 %.

This demonstrates that chemical bath deposition can have profound effects on the solar cell performance. When trying to improve the best cells only detrimental effects showed up. This might show that, a part in the recipe used, NaOH has detrimental effects on solar cells.

Ammonia free chemical bath deposition is possible, however so far it has not produced as good results as the reference. The difference is however very small, which makes it worth further investigating with moreand better solar cell material.

Place, publisher, year, edition, pages
2013. , 52 p.
Series
UPTEC K, ISSN 1650-8297 ; 13010
Keyword [en]
CIGS, CBD, Ammonia free, solar cell
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-206786OAI: oai:DiVA.org:uu-206786DiVA: diva2:645419
Subject / course
Chemistry
Educational program
Master Programme in Chemical Engineering
Presentation
2013-06-12, Å2002, Lagerhyddsvägen 2, Uppsala, 09:00 (Swedish)
Supervisors
Examiners
Available from: 2013-09-10 Created: 2013-09-04 Last updated: 2013-09-10Bibliographically approved

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CiteExportLink to record
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