Proceedings - Viện Vật lý

Advances _________________________________________________________________________________in Optics, Photonics, Spectroscopy and Applications. Aug. 2006, Cantho, VietnamTài liệu tham khảo1. Nguyễn Quang Liêm, Đỗ Xuân Thành, Vũ Xuân Quang, Nguyễn Thị Thuý Liễu,Đặng Huy Đạt. “Huỳnh quang bờ vùng của tinh thể ZnO” - Báo cáo hội nghị Vật lýChất rắn toàn quốc lần thứ III - Nha Trang, 8-8/10/2001.2. Đang Huy Dat, Nguyen Thi Thuy Lieu, Nguyen Quang Liem. “Electrochemicaldeposition of ZnO crystalline films and thier optical properties” The ThirdNational Confnerence on Optics & Spectroscopy, Nha Trang 11- 15 August 2002.3. Nguyễn Thị Thúy Liễu “Động học các hạt tải điện trong bán dẫn hợp chất II - VIvùng cấm rộng”. Luận án tiến sĩ khoa học (2005).4. Harish Bahadur, Ram Kishore, K.N. Sood, Rashmi, R.K. Sharma, A. Basu D.Haranath, Harish Chander and Sudhir Chandra “Characterization of thin flim ofZnO prepared by sol - gel processes”.5. T. J. Inagaki, M. Aihara (2004), Many – body theory for “luminescence spectra inhigh-density electron-hol systems”, Phys. Rev. B 65, 205204, 1-13.6. N. Peyghambarian, S.W. kpch, A. Mysyrowicz (1993), “ Introduction toSemiconductor Optics”, prentice – Hall, Inc, Englewood Cliffs, New Jersey.STRUCTURE AND OPTICAL PROPERTIES OF SOL-GEL SPIN-COATING PREPARED ZINC OXIDE FILMSLuong Tien Tung, Nguyen The Khoi, Nguyen Van Hung, Luc Huy Hoang,Nguyen Thi Thu Hang and Dinh Thi Phuong NgaFaculty of physics, Hanoi University of Education, Hanoi, VietnamAbstract: Zinc oxide films were fabricated on SiO 2 substrates in air by sol-gel spincoatingmethod using two chemical system: 1. zinc acetate Zn(CH 3 COO) 2 . 2H 2 O,methanol CH 3 OH and triethylamide (C 6 H 15 N); 2. zinc acetate Zn(CH 3 COO) 2 .2H 2 O, distilled water, acid citric (C 6 H 8 O 7 ), glycerine (C 3 H 8 O 3 ) and tryethylamide(C 6 H 15 N). The influence of annealing temperatures ranging from 450°C to 800°Con the structure and optical properties of the films were systematically investigatedusing the XRD; SEM and photoluminescence (PL). The films show apolycrystalline hexagonal wurtzite structure which were prepared using the fistsystem have preferential orientation along (002) direction and the other withoutpreferred orientation. The SEM surface image of the films formed at 450 0 C showthat the medium-sized grain is about 15nm. The PL spectra of the ZnO films displaytwo emission bands, predominant ultraviolet (UV) emission and weak deep levelvisible emission. It is observed that the ZnO film annealed at 450°C exhibits thestrongest UV emission intensity and loses completely visible emission which isattributed to the good crystalline quality of the ZnO film and the low rate offormation of intrinsic defects at such low temperature. The cryogenic temperaturephotoluminescence of ZnO films at different medium-sized grains were studied anddiscussed.99