Study of Alkali (Na,K)-Doped Cu2ZnSnS4 Thin Films Prepared by Sol–Gel Method

Autor:	Morteza Izadifard, R. Hosseinpour, Mohammad Ebrahim Ghazi
Rok vydání:	2021
Předmět:	010302 applied physics Materials science Dopant Doping Analytical chemistry 02 engineering and technology Substrate (electronics) engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Optical conductivity Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry 0103 physical sciences engineering CZTS Kesterite Thin film 0210 nano-technology Sol-gel
Zdroj:	Semiconductors. 55:179-193
ISSN:	1090-6479 1063-7826
DOI:	10.1134/s1063782621020135
Popis:	The non-doped and alkali (Na,K)-doped Cu2ZnSnS4 (CZTS) thin films were prepared using the sol–gel spin-coating method on the glass substrate, and the changes in the structural, optical, and electrical characteristics of the films were examined and compared. The structural study results obtained showed that all the prepared samples had a kesterite structure. The scanning electron microscopy and Raman analysis showed that the samples' surface and crystalline quality were significantly changed by doping, and an appropriate amount of dopants can improve them. The optical study showed that the energy gap values for the CZTS layers were in the range of 1.40–1.61 eV, which is desirable for solar cells. Moreover, good optical conductivity values (1012–1015 s–1) and high absorption coefficients (up to 1.8 × 105 cm–1 in the visible region) were obtained for the CZTS thin films. Investigation of the sample’s electrical properties indicated that non-doped and doped CZTS was p-type, and therefore doping did not change the type of the charter of thin films. Moreover, the carrier concentration of the samples significantly increased up to 8.00 × 1019 cm–3 (one order of magnitude increase) with the doping. The samples’ photovoltaic properties showed that the fabricated ZnS|CZTS hetero-junction exhibited good rectifying behavior and the doped layers had better diode parameters. Overall, the results showed that the CZTS thin films doped with an appropriate amount of dopants (1% Na and 1.5% K) had better structural, optical, and electrical properties. The photo-electrical study of the samples showed that for all samples, photocurrent under illumination significantly increased (especially for Na-doped CZTS thin films), indicating that the CZTS thin films are suitable for solar energy conversion.
Databáze:	OpenAIRE
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