Low-Frequency Noise Characteristics of ZnO Nanorods Schottky Barrier Photodetectors

Abstract

A Schottky barrier photodetector with ZnO nanorods is fabricated on a glass substrate and the I-V characteristics are investigated. The ZnO nanorods are synthesized by an aqueous method, which allowed the fabricated Schottky barrier photodetector to be more sensitive in the UV region. Under 370-nm illumination, the photocurrent of the ZnO nanorod Schottky barrier photodetector is 6.56 μA and the UV-to-visible ratio is 780.8 at -1V. In addition, the noise equivalent power and normalized detectivity (D*) of the photodetector are 6.74×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-13</sup> W and 3.29 ×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sup> cmHz <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.5</sup> W <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> at -1V, respectively.