Altering NH4OH concentration in producing chemical bath deposited CdS to steadily support electrodeposited CdTe

•Identification of instability of chemical bath deposited (CBD) CdS in electrodepositing (ED) CdTe.•Altering the CBD bath conditions to develop a stable CdS film to withstand under CdTe ED conditions.•Testing stability of altered CBD-CdS samples by electrodepositing CdTe. Development of chemical bat...

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Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2021-03, Vol.265, p.114952, Article 114952
Main Authors: Gajanayake, G.K.U.P., De Silva, D.S.M., Atapattu, H.Y.R.
Format: Article
Language:English
Subjects:
Ammonium hydroxide
Cadmium sulfide
Cadmium tellurides
CdS
CdTe
Chemical bath deposition
Chemical composition
Circuits
Electrochemical cells
Electrodeposition
Energy gap
Light transmittance
Open circuit voltage
Optical properties
Parameter identification
Photoelectrochemical devices
Short circuit currents
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Summary:•Identification of instability of chemical bath deposited (CBD) CdS in electrodepositing (ED) CdTe.•Altering the CBD bath conditions to develop a stable CdS film to withstand under CdTe ED conditions.•Testing stability of altered CBD-CdS samples by electrodepositing CdTe. Development of chemical bath deposited (CBD) CdS to steadily support the electrodeposited (ED) CdTe, by changing the volume of NH4OH, a pH adjuster, in the CBD bath is reported here. The optimal volume of NH4OH, which is the controlling parameter of interest, was identified based on the optical, electrical, structural, and morphological properties of the CdS developed. The sample developed exhibits the band gap energy of 2.32 eV with light transmittance >80% (500–900 nm). The photo-electrochemical cell and Mott-Schottky studies revealed n-type conductivity, open circuit voltage (VOC) of 0.529 V, and short circuit current density (JSC) of 12.290 μA/cm2 at the CdS/electrolyte junction while the X-ray diffraction data and phase analysis revealed the formation of a blended hexagonal/cubic structures. Further, the scanning electron microscopic and the energy-dispersive X-ray spectroscopic studies elucidated a well-compact grain arrangement and agreed with the theoretical chemical composition (1:1) of CdS respectively.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2020.114952