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TitleEffect of Close Space Sublimation Deposited CdS on the Performance and OBIC Response of CdTe Solar Cells
Author(s)Jonathan Major, Ken Durose
KeywordsCdS, CdTe, Devices
TopicThin Film Solar Cells
SubtopicCdTe Solar Cells
Event25th EU PVSEC / WCPEC-5
Session3BV.2.114
Pages manuscript3476 - 3480
ISBN3-936338-26-4
DOI10.4229/25thEUPVSEC2010-3BV.2.114
Abstract/Summary

The role of oxygen in close space sublimation (CSS) deposited CdS films upon the performance of CdTe/CdS solar cells was investigated. CdS films were deposited using a range of oxygen pressures, with the effect on device performance being assessed by J-V, external quantum efficiency and optical beam induced current (OBIC) analysis. By inclusion of increased quantities of oxygen into the CdS deposition ambient (0 - 4 Torr) the average device VOC was found to increase from 0.57 V to 0.67 V, whilst all other parameters showed no systematic variation. Multi-wavelength OBIC analysis of devices with CdS layers deposited under vacuum and oxygen (but otherwise similar), revealed those with oxygen to have a more uniform photovoltaic response. High resolution SEM analysis of CdS layers shows the range of CdS grain size achievable by CSS deposition. Further improvements to all-CSS deposited cells are reported with cell efficiencies of up to 11.65% being measured.

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