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Effect of Chlorine Plasma Treatment on Electronic Properties of GIZO Thin Film Grown on SiO2/Si Substrate
Dahlang Tahir1, Suhk Kun Oh2, Hee Jae Kang2, Sung Heo3, Jae Gwan Chung3 & Jae Cheol Lee3
1Department of Physics, Hasanuddin University,
Jalan Perintis Kemerdekaan 10 Tamalanrea Makassar, 90245, Indonesia
2Department of Physics, Chungbuk National University,
Cheongju, 361-763, South Korea
3Analytical Engineering Center, Samsung Advanced Institute of Technology,
Suwon, 440-600, South Korea
Email: allanctahir@yahoo.com
Abstract. The effect of chlorine plasma treatment on electronic properties of GIZO grown on SiO2/Si by RF magnetron sputtering was investigated using X-ray photoelectron spectroscopy (XPS), reflection electron energy loss spectroscopy (REELS), and secondary ion mass spectroscopy (SIMS). SIMS depth profiles indicated that the concentration of InO and ZnO on the surface was decreased after Cl2 plasma treatment. REELS data showed that the band gap increased from 3.4 to 3.7 eV. XPS showed that Ind5/2 and Zn2p3/2 shifted to the higher binding energies by 0.5 eV and 0.3 eV, respectively. These phenomena were caused by oxygen deficiency and hydrocarbon contamination reduction as indicated by Cl atom bonding with In and Zn cations that are present on the surface after Cl2 plasma treatment.
Keywords: bandgap; chlorine; GIZO; REELS; SIMS; XPS.
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