분무열분해법으로 성장된 CdO:Li 박막의 구조와 광학적, 전기적 특성.

Abstract

CdO:Li films were deposited on the glass substrates by spray pyrolysis. The Structure, optical and electrical properties of CdO:Li films had been studied using XRD(X-ray diffractometer), SEM(Scanning electron microscope), EDS(Energy dispersive X-ray spectroscopy), UV-VIS-NIR spectrophotometer and Hall effect experiment. Transparent and conductive CdO films prepared at substrate temperatures ranging from 400 ℃ to 520 ℃ were identified as CdO with a preferred (111) orientation. The crystal structure of CdO:Li films depositing at 450℃ was cubic structure with lattice constant a0 = 4.689Å. XRD pattern intensity of (111) plane of CdO:Li films were decreased with increasing Li concentration. But 2(peak position) of (111) plane were not changed. The optical transmission of the sample deposited with Li concentration (0 ~ 10.0 at.%) were 60 ~ 80 % in the wavelength range from 300 nm to 900 nm. Optical transmission of the CdO:Li films decreased with increasing Li concentration. The optical energy band gap of the CdO:Li films deposited with a Li concentration of 4.0 at.% was 2.618 eV. The optical energy band gaps of CdO:Li films has been a noticeable increase up to 8.0 at.%. After which it increases then rapidly decreases. Electric resistivity, carrier concentration, mobility and Hall coefficient of the p-type CdO:Li films deposited with a Li concentration of 8.0 at.% were 1.3933×10-4 Ω·cm, 63.632×1020 cm-3, 19.811 cm2/V·s, 0.0010 cm2/C, respectively. Also, this paper is expected to contribute teaching and learning for new science curriculum of educational viewpoint.