The Comparison of Photoconductivities for Anatase and Rutile TiO2 Nanorods

• Main Authors: Yi-Ling Liu, 劉怡伶
• Other Authors: Ying-Sheng Huang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/54476338813156709947

碩士 === 國立臺灣科技大學 === 電子工程系 === 101 === We comparatively investigated the photoconduction (PC) efficiency and its physical mechanism of the anatase and rutile titanium dioxide (TiO2) nanorods with single-crystalline quality grown by cold-wall metal-organic chemical vapor deposition (MOCVD). The anatase TiO2 nanorods revealing similar oxygen-sensitized PC mechanism as the rutile ones has been confirmed by the environment-dependent PC measurement. The normalized gain which has the physical meaning of intrinsic PC efficiency has been defined and discussed for the as-grown TiO2 nanorods. It is found that the anatase TiO2 nanorods exhibit higher normalized gain for near one order of magnitude than the rutile phase. The optimal normalized gain of the anatase nanorods can reach 1.75×10-4 m2/V at the light intensity of 0.016W/m2. By the time-resolved PC measurement, the physical origin leading to the superior PC efficiency in anatase TiO2 nanorods in comparison to the rutile phase is proposed to be the probably higher electron mobility rather than carrier lifetime.