The photo-electric and thermal properties of vacuum deposited CdS thin films

Mohammed, Wagah F.; Nory, Amir M.

doi:10.1016/s0960-1481(98)00058-5

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…CdS, with band gap of 2.4 eV at room temperature, is the most suitable material for CdTe-based solar cells. The work of [17][18][19] showed that without special doping, the CdS films have significantly higher carrier concentration than the CdTe. The third layer is the absorber layer of CdTe, which is usually from 5 -10 µm thick film.…”

Section: Laboratory Preparations and Solar Cell Structurementioning

confidence: 99%

Power Conversion Enhancement of CdS/CdTe Solar Cell Interconnected with Tunnel Diode

Mohammed¹,

Daoud²,

Al-Tikriti³

2012

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One of the most promising solar cell devices is cadmium telluride (CdTe) based. These cells however, have their own problems of stability and degradation in efficiency. Measurements show that CdS/CdTe solar cell has high series resistance which degrades the performance of solar cell energy conversion. Both active layers (CdS and CdTe) had been fabricated by thermal evaporation and tested individually. It was found that CdS window layer of 300 nm have the lowest series resistance with maximum light absorption. While 5 - 7 µm CdTe absorber layer absorbed more than 90% of the incident light with minimum series resistance. A complete CdS/CdTe solar cell was fabricated and tested. It was found that deposited cell without heat treatment shows that the short circuit current increment decreases as the light intensity increases. This type of deposited cell has low conversion efficiency. The energy conversion efficiency was improved by heat treatment, depositing heavily doped layer at the back of the cell and minimizing the contact resistivity by depositing material with resistivity less than 1 m??cm<sup>2</sup>. All these modifications were not enough because the back contact is non-ohmic. Tunnel diode of CdTe (p++)/CdS (n++) was deposited in the back of the cell. The energy conversion efficiency was improved by more than 7%

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Section: Laboratory Preparations and Solar Cell Structurementioning

confidence: 99%

Power Conversion Enhancement of CdS/CdTe Solar Cell Interconnected with Tunnel Diode

Mohammed¹,

Daoud²,

Al-Tikriti³

2012

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“…It also has acceptable conversion efficiency, adequate absorption coefficient in addition to its low cost. Thin films, in general, have been subjected to numerous theoretical [5] and practical [6] research works. But on the other hand, further research is required to fully understand and improve the materials properties.…”

Section: Introductionmentioning

confidence: 99%

The effects of deposition parameters on CdS thin films optoelectronic properties

Munther¹,

Wagah²

2017

Seventh International Conference on Advances in Computing, Electronics and Electrical Technology - CEET 2017

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Cadmium sulfide CdS has band gab of 2.42 eV, which is suitable as window material for thin film to fabricate solar cell. It has high absorption coefficient and acceptable conversion efficiency in addition to its low cost. Many samples are prepared using vacuum evaporation techniques with different deposition parameters. Hall Effect, resistivity and optoelectronic measurements are conducted on the fabricated samples. The analysis of the results indicates that the optoelectronic properties, namely photogenerated current are dependent on the thickness, substrate temperature and deposition rate.

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“…Badawi et al [7] studied the optical transmittance of the chemically deposited CdS films. Mohammed et al [8] investigated the photoconductivity of CdS thin film. They have found that the photo-current is proportional to the light intensity, thickness of the CdS film, and the substrate temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermosensitive conductivity of CdS thin film

et al. 2010

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In this paper, deposition of CdS thin films by thermal evaporation was made using high purity CdS powders as the source material. It is found that the electrical conductivity of thermal evaporated CdS thin films is very sensitive to heat. The change of surface temperature of this material leads to the significant increase in its electrical conductivity as shown by the relationship of temperature and electrical resistance. It is concluded that such a temperature-sensitive conductive behavior comes from the thermally-activated electron ejection in CdS.

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The photo-electric and thermal properties of vacuum deposited CdS thin films

Cited by 7 publications

References 4 publications

Power Conversion Enhancement of CdS/CdTe Solar Cell Interconnected with Tunnel Diode

Power Conversion Enhancement of CdS/CdTe Solar Cell Interconnected with Tunnel Diode

The effects of deposition parameters on CdS thin films optoelectronic properties

Thermosensitive conductivity of CdS thin film

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