화학적 용액성장법에 의한 ZnS 박막의 제조 시 ammonia 및 Na2EDTA의 영향
Influence of Ammonia and Na2EDTA on Properties of Chemical Bath Deposited ZnS Thin Films
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ZnS thin films were prepared on glass substrate by using chemical bath deposition method. The influenceof ammonia (NH4OH) and Na2EDTA (Na2C10H16N2O8) as complexing agents on structural and optical propertiesof ZnS thin films were investigated. Zinc acetate dihydrate (Zn(CH3COO)2·2H2O) and thiourea (H2NCSNH2)were used as a starting materials and distilled water was used as a solvent. All ZnS thin films, regardlessof a kind of complexing agents, had the hexagonal structure (α-ZnS) and had a preferred <101> orientation. ZnS thin films, with 4 M ammonia and with 4 M ammonia and 0.1 M Na2EDTA, had the highest <101>peak intensity. In addition, their average particle size are 280 nm and 220 nm, respectively. The average opticaltransmittances of all films were higher than 60% in the visible range. The optical direct band gap valuesof films were about 3.6~3.8 eV.
Abstract
ZnS thin films were prepared on glass substrate by using chemical bath deposition method. The influence of ammonia (NH4OH) and Na2EDTA (Na2C10H16N2O8) as complexing agents on structural and optical properties of ZnS thin films were investigated. Zinc acetate dihydrate (Zn(CH3COO)2·2H2O) and thiourea (H2NCSNH2)were used as a starting materials and distilled water was used as a solvent. All ZnS thin films, regardless of a kind of complexing agents, had the hexagonal structure (α-ZnS) and had a preferred <101> orientation. ZnS thin films, with 4 M ammonia and with 4 M ammonia and 0.1 M Na2EDTA, had the highest <101>peak intensity. In addition, their average particle size are 280 nm and 220 nm, respectively. The average optical transmittances of all films were higher than 60% in the visible range. The optical direct band gap values of films were about 3.6~3.8 eV.
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