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Báo cáo hóa học: " Effect of Composition on Electrical and Optical Properties of Thin Films of Amorphous GaxSe1002x Nanorods"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: gEffect of Composition on Electrical and Optical Properties of Thin Films of Amorphous GaxSe1002x Nanorods | Nanoscale Res Lett 2010 5 1512-1517 DOI 10.1007 s11671-010-9671-5 NANO EXPRESS Effect of Composition on Electrical and Optical Properties of Thin Films of Amorphous GaxSe100-x Nanorods Zishan H. Khan Shamshad A. Khan Numan Salah Sami Habib S. M. Abdallah El-Hamidy A. A. Al-Ghamdi Received 13 May 2010 Accepted 7 June 2010 Published online 27 June 2010 The Author s 2010. This article is published with open access at Springerlink.com Abstract We report the electrical and optical studies of thin films of a-GaxSe100-x nanorods x 3 6 9 and 12 . Thin films of a-GaxSe100-x nanorods have been synthesized thermal evaporation technique. DC electrical conductivity of deposited thin films of a-GaxSe100-x nanorods is measured as a function of temperature range from 298 to 383 K. An exponential increase in the dc conductivity is observed with the increase in temperature suggesting thereby a semiconducting behavior. The estimated value of activation energy decreases on incorporation of dopant Ga content in the Se system. The calculated value of preexponential factor r0 is of the order of 101 X-1 cm- which suggests that the conduction takes place in the band tails of localized states. It is suggested that the conduction is due to thermally assisted tunneling of the carriers in the Z. H. Khan N. Salah S. Habib Center of Nanotechnology King Abdulaziz University Jeddah Saudi Arabia Z. H. Khan Department of Applied Sciences Humanities Faculty of Engineering Technology Jamia Millia Islamia Central University New Delhi India e-mail zishan_hk@yahoo.co.in S. A. Khan A. A. Al-Ghamdi Department of Physics King Abdulaziz University Jeddah Saudi Arabia S. A. Khan Department of Physics St. Andrew s College Gorakhpur UP 273001 India S. M. Abdallah El-Hamidy Microscopy Unit Biological Sciences Department King Abdulaziz University Jeddah Saudi Arabia localized states near the band edges. On the basis of the optical absorption measurements an indirect optical band gap is observed in this system and