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Synthesis of CdZnS by Chemical Bath Deposition for Thin Film Solar Cells
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
2017 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The buffer layer is a crucial component in thin film solar cells. Defects at the interface between absorber and buffer layer lead to high recombination rate and the band structure at the interface highly affects the performance of the solar cell. In this thesis a method to synthesize thin films containing cadmium, zinc and sulfur, CdZnS, by chemical bath deposition has been developed and evaluated. A higher current from the device is expected when replacing the common buffer layer cadmium sulfide, CdS, with the more transparent CdZnS. It is also possible that the alternative buffer provides a more favorable energy band alignment at the interface with the absorber Copper-Zinc-Tin-Sulfide (CZTS). The deposition process was developed by studying depositions on glass. Increasing [Zn2+]/[Cd2+] initially led to films with higher band gap (Eg). By varying deposition time the time before colloidal growth became dominant was observed. Addition of triethanolamine showed that triethanolamine binds stronger to zinc ions than to cadmium ions. Two recipes that led to Eg=2.63 eV were evaluated as buffer layer in Copper-Indium-Gallium-Selenide (CIGSe) and CZTS solar cells. The short circuit current of the devices increased in general with the CdZnS buffers compared to CdS. The best CZTS cell with a CdZnS buffer layer had 7.7 % efficiency compared to the 7.5 % reference. For future research it is recommended that the effect of thickness variation and deposition temperature is evaluated and that additional material characterization is performed in order to further understand and develop the deposition method.

Place, publisher, year, edition, pages
2017. , p. 28
Series
UPTEC K, ISSN 1650-8297 ; 17014
Keywords [en]
CdZnS, Chemical Bath Deposition, Thin film solar cells, CZTS, CIGS
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:uu:diva-324899OAI: oai:DiVA.org:uu-324899DiVA, id: diva2:1112070
Educational program
Master Programme in Chemical Engineering
Supervisors
Examiners
Available from: 2017-06-26 Created: 2017-06-19 Last updated: 2017-06-26Bibliographically approved

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CiteExportLink to record
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