Effect of Deposition LaserEnergy on the Optical Properties of CuAlO2 Films

doi:10.3724/SP.J.1077.2011.00281

Journal of Inorganic Materials ›› 2011, Vol. 26 ›› Issue (3): 281-285.DOI: 10.3724/SP.J.1077.2011.00281

• Research Paper • Previous Articles Next Articles

Effect of Deposition LaserEnergy on the Optical Properties of CuAlO₂ Films

DENG Zan-Hong¹,² , FANG Xiao-Dong¹,² , TAO Ru-Hua¹,² , DONG Wei-Wei¹,² , ZHOU Shu¹,² , MENG Gang¹,² , SHAO Jing-Zhen¹,²

1. Anhui Provincial Key Lab of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; 2. Key Lab of New Thin Film Solar Cells, Chinese Academy of Sciences, Hefei 230031, China

Received:2010-06-05 Revised:2010-07-17 Published:2011-03-20 Online:2011-02-18
Supported by:
Natural Science Foundation of Anhui Province(090414169); The KnowledgeInnovation Program of the Chinese Academy of Sciences

Abstract

Abstract: CuAlO₂ films were prepared by pulsed laser deposition (PLD) on Al₂O₃(001).And the effect of deposition laser energy on the microstructure, morphologies and optical properties of the films were studied. The in-situ deposited films were amorphous in the deposition laser energyof 100-180mJ. After ex-situ annealed in N₂ atmosphere at 900℃ for 1 h, all the films were single phase CuAlO₂with c-axis orientation and the crystal sizes were about 49nm. With the increase of deposition laser energy,the film thickness and surface particle sizes increased, while the visiblelight transmittance decreased. Room-temperature photoluminescence measurements of the CuAlO₂ films deposited with laser energy of 100mJ and 180mJ only showed an ultraviolet near-band-edge emission peak at 350 nm (around 3.5eV) in the range of 325-650 nm, which originated from the generation and recombination of electron-hole pairs, namely, excitons. This observation indicates the existence of direct transition-type band gap of thismaterial, which is favorable for the optoelectronics applications such aslight-emitting diodes (LEDs).

Key words: pulsed laser deposition, CuAlO₂ films, optical band energy, room-temperature photolumine scence spectra

CLC Number:

TQ174

DENG Zan-Hong, , FANG Xiao-Dong, , TAO Ru-Hua, , DONG Wei-Wei, , ZHOU Shu, , MENG Gang, , SHAO Jing-Zhen,. Effect of Deposition LaserEnergy on the Optical Properties of CuAlO₂ Films[J]. Journal of Inorganic Materials, 2011, 26(3): 281-285.

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Effect of Deposition LaserEnergy on the Optical Properties of CuAlO₂ Films

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