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alpha-SnSe thin film solar cells produced by selenization of magnetron sputtered tin precursors
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Pennsylvania State University, United States .
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2018 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 176, p. 251-258Article in journal (Refereed) Published
Abstract [en]

The temperature-pressure-composition phase diagrams of Sn-Se system were calculated using the CALPHAD (CALculation of PHase Diagram) models. The phase diagrams showed the formation of alpha-SnSe phase at selenium-rich side with pressures lower than atmospheric pressure and in the temperature range of 300-500 degrees C. As a first step, the effect of Sn/Se ratio on the phase formation was studied experimentally by selenization of tin metal precursor films using effusion cell evaporation. The Sn/Se ratio was varied by changing the selenium weight in the range of 0.5-1.5 g. The physical properties of the films were studied with suitable characterization techniques and the obtained results showed the formation of single phase alpha-SnSe at 1.0 g of selenium. Further, alpha-SnSe/CdS interface was studied by photoelectron yield spectroscopy (PYS), which showed a 'type-I' band alignment with a valence-band offset (Delta E-v) of 1.3 eV and a conduction-band offset (Delta E-c) of 0.2 eV. Finally, alpha-SnSe solar cells with a device structure of soda-lime glass (SLG)/Mo/alpha-SnSe/CdS/i-ZnO/Al:ZnO/Ni/Ag were fabricated and a power conversation efficiency of 1.42% was achieved at 1.0 g of selenium.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 176, p. 251-258
Keyword [en]
Phase diagram, alpha-SnSe, Thin film solar cell, Two-stage selenization process, Band alignment
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-223255DOI: 10.1016/j.solmat.2017.12.003ISI: 000423643800028Scopus ID: 2-s2.0-85038072855OAI: oai:DiVA.org:kth-223255DiVA, id: diva2:1183749
Note

QC 20180219

Available from: 2018-02-19 Created: 2018-02-19 Last updated: 2018-02-19Bibliographically approved

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Lindwall, Greta

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