Cationic and anionic modification of CdS thin films by surface chemical treatment

Alejandro Baray-Calderón, Próspero Acevedo-Peña, Omar A. Castelo-González, Claudia Martínez-Alonso, Mérida Sotelo-Lerma, M. C. Arenas-Arrocena, Hailin Hu

Research output: Contribution to journalArticle

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Abstract

© 2019 Elsevier B.V. Structural and physical properties of thin solid films can be modified by surface treatment. In this work, chemical bath deposited CdS thin films were treated both by a mercury chloride solution and by a saturated H 2 S gas. The effect of these treatments on electrical properties is clearly observed. Hg 2+ doped CdS films show the highest dark and photo-conductivities, whereas the sulfurized CdS films become photo-insensitive. In Hg 2+ doped CdS samples, new crystalline Hg 3 S 2 Cl 2 and Hg 2 (ClO 4 ) 2 4H 2 O phases are found, and particle size reduction is observed at the surface. Both optical and electrochemical Mott-Schottky (M–S) analysis suggest an intraband level in the electronic structure of Hg 2+ modified CdS. Sulfurized CdS films, on the other hand, keep unchanged their crystalline and morphological structure, as well as optical properties. Energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and M–S analysis indicate an increase of sulfur concentration at the surface of sulfurized CdS thin films, leading to a more stoichiometric CdS compound, which used to have lower conductivity. It demonstrates that ion exchange process or cationic substitution is effective for structural and physical property modification, whereas a gaseous saturation method or anionic modification results in a notable surface energy alteration in thin solid CdS films.
Original languageAmerican English
Pages (from-to)676-683
Number of pages607
JournalApplied Surface Science
DOIs
StatePublished - 1 May 2019

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Thin films
thin films
Structural properties
Physical properties
physical properties
Crystalline materials
X-ray spectroscopy
low conductivity
conductivity
physical property
surface treatment
Mercury
Sulfur
Interfacial energy
surface energy
Electronic structure
Surface treatment
Chlorides
Energy dispersive spectroscopy
baths

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Baray-Calderón, A., Acevedo-Peña, P., Castelo-González, O. A., Martínez-Alonso, C., Sotelo-Lerma, M., Arenas-Arrocena, M. C., & Hu, H. (2019). Cationic and anionic modification of CdS thin films by surface chemical treatment. Applied Surface Science, 676-683. https://doi.org/10.1016/j.apsusc.2018.12.201
Baray-Calderón, Alejandro ; Acevedo-Peña, Próspero ; Castelo-González, Omar A. ; Martínez-Alonso, Claudia ; Sotelo-Lerma, Mérida ; Arenas-Arrocena, M. C. ; Hu, Hailin. / Cationic and anionic modification of CdS thin films by surface chemical treatment. In: Applied Surface Science. 2019 ; pp. 676-683.
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Baray-Calderón, A, Acevedo-Peña, P, Castelo-González, OA, Martínez-Alonso, C, Sotelo-Lerma, M, Arenas-Arrocena, MC & Hu, H 2019, 'Cationic and anionic modification of CdS thin films by surface chemical treatment', Applied Surface Science, pp. 676-683. https://doi.org/10.1016/j.apsusc.2018.12.201

Cationic and anionic modification of CdS thin films by surface chemical treatment. / Baray-Calderón, Alejandro; Acevedo-Peña, Próspero; Castelo-González, Omar A.; Martínez-Alonso, Claudia; Sotelo-Lerma, Mérida; Arenas-Arrocena, M. C.; Hu, Hailin.

In: Applied Surface Science, 01.05.2019, p. 676-683.

Research output: Contribution to journalArticle

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T1 - Cationic and anionic modification of CdS thin films by surface chemical treatment

AU - Baray-Calderón, Alejandro

AU - Acevedo-Peña, Próspero

AU - Castelo-González, Omar A.

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AU - Arenas-Arrocena, M. C.

AU - Hu, Hailin

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N2 - © 2019 Elsevier B.V. Structural and physical properties of thin solid films can be modified by surface treatment. In this work, chemical bath deposited CdS thin films were treated both by a mercury chloride solution and by a saturated H 2 S gas. The effect of these treatments on electrical properties is clearly observed. Hg 2+ doped CdS films show the highest dark and photo-conductivities, whereas the sulfurized CdS films become photo-insensitive. In Hg 2+ doped CdS samples, new crystalline Hg 3 S 2 Cl 2 and Hg 2 (ClO 4 ) 2 4H 2 O phases are found, and particle size reduction is observed at the surface. Both optical and electrochemical Mott-Schottky (M–S) analysis suggest an intraband level in the electronic structure of Hg 2+ modified CdS. Sulfurized CdS films, on the other hand, keep unchanged their crystalline and morphological structure, as well as optical properties. Energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and M–S analysis indicate an increase of sulfur concentration at the surface of sulfurized CdS thin films, leading to a more stoichiometric CdS compound, which used to have lower conductivity. It demonstrates that ion exchange process or cationic substitution is effective for structural and physical property modification, whereas a gaseous saturation method or anionic modification results in a notable surface energy alteration in thin solid CdS films.

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Baray-Calderón A, Acevedo-Peña P, Castelo-González OA, Martínez-Alonso C, Sotelo-Lerma M, Arenas-Arrocena MC et al. Cationic and anionic modification of CdS thin films by surface chemical treatment. Applied Surface Science. 2019 May 1;676-683. https://doi.org/10.1016/j.apsusc.2018.12.201