Abstract
Origin of the well-known blue-green emission of spray pyrolysed ZnO thin films has been discussed on the basis of variation of the properties due to different treatment of the samples such as ion beam irradiation and doping. 120 MeV Au ions and 80 MeV Ni ions were used for ion beam irradiation while indium was used for doping studies. It was assumed that, Au ions might have produced huge amount of defects while the defects might be less in Ni irradiated films due to the difference in energy and mass number. Photoluminescence studies of pristine sample showed only one emission at 517 nm at room temperature while the irradiated films showed a decrease in intensity of this emission. Indium doping also reduced the intensity of this emission. But additional emissions were also observed in these films. Based on the observations, we proposed that the blue-green emission was due to the transition from conduction band to the level due to oxygen antisite (OZn).
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References
Sano M, Miyamoto K, Kato H, Yao T (2004) J Appl Phys 95:5527
Norton DP, Heo YM, Ivill MP, Ip K, Pearton SJ, Chisholm MF, Steiner T (2004) Mater Today 7(6):34
Heo YW, Norton DP, Pearton SJ (2005) J Appl Phys 98:73502
Ratheesh Kumar PM, Sudha Kartha C, Vijayakumar KP, Singh F, Avasthi DK, Abe T, Kashiwaba Y, Okram GS, Kumar M, Sarvesh Kumar M (2005) J Appl Phys 97:13509
Garces NY, Wang L, Bai L, Giles NC, Halliburton LE, Cantwell G (2001) Appl Phys Lett 81:2285
Studenikin SA, Golego N, Cocivera M (1998) J Appl Phys 84:2287
Minami T, Nanto H, Takata S (1981) J Lumin 24/25:63
Kang HS, Kang JS, Kim JW, Lee SY (2004) J Appl Phys 95:1246
Vanheusden K, Seager CH, Warren WL, Tallant DR, Voigt JA (1996) Appl Phys Lett 68:403
Egelhaaf H.-J., Oelkrug D (1996) J Cryst Growth 161:190
Xu PS, Sun YM, Shi CS, Xu GFQ, Pan HB (2003) Nucl Instrum Meth Phys Res B 199:286
Lin B, Fu Z, Jia Y (2001) Appl Phys Lett 79:943
Hur T-B, Jeen GS, Hwang Y-H, Kim H-K (2003) J Appl Phys 94:5787
Kityk IV, Ebothe J, Hichou AE, Addou M, Bougrine A, Sahraouni B (2002) J Phys Condens Matter 14:5407
Van Vechten JA (1975) J Electrochem Soc 122:419
Sun YM (2000) Ph.D. Thesis, University of Science and Technology of China, July 2000
Ortiz A, Falcony C, Hernandez AJ, Garcia M, Alonso JC (1997) Thin Solid Films 293:103
Jin BJ, Im S, Lee SY (2000) Thin Solid Films 366:107
Wang YG, Lau SP, Zhang XH, Lee HW, Hng HH, Tay BK (2003) J Crystal Growth 252:265
Acknowledgement
One of the authors (PMR) is grateful to Ministry of Non-Conventional Energy (MNES), India for the financial assistance through National Renewable Energy (NRE) Fellowship. Another author (KPV) is grateful to the Cochin University of Science and Technology for granting him sabbatical leave to do this work. Authors acknowledge Dr. Fouran Singh, Nuclear Science Center, New Delhi for PL measurements. Assistance from UGC, India through DSA II scheme is also gratefully acknowledged.
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Ratheesh Kumar, P.M., Vijayakumar, K.P. & Sudha Kartha, C. On the origin of blue-green luminescence in spray pyrolysed ZnO thin films. J Mater Sci 42, 2598–2602 (2007). https://doi.org/10.1007/s10853-006-1339-2
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DOI: https://doi.org/10.1007/s10853-006-1339-2