Abstract
In the present work, an attempt has been made to study photoconductivity and dark conductivity in gadolinium doped zinc oxide in air as well as in vacuum synthesized by heat treatment method. Structural and morphological studies have been performed using XRD and SEM respectively. XRD indicates that ZnO:Gd (5.0%) is having mixed phase of ZnO and Gd2O3. SEM images of ZnO:Gd (5.0%) indicates formation of spherical shaped particles of size lying in the range of 200–400 nm. UV–visible absorption spectra in undoped ZnO and Gd doped ZnO show absorption edges at 385 and 380 nm respectively. Photoluminescence (PL) spectrum of undoped ZnO exhibits peaks centered around at 401, 418, 455, 481 and 522 nm. Gd doped ZnO exhibits almost similar peaks. The PL spectra revealed various Zn and O related native defects (eg. vacancies, interstitials, antisites etc.) Voltage dependence of photocurrent and dark current is measured at room temperature under UV–visible illumination. Rise and decay curves exhibit anomalous behavior of photocurrent in air as well as in vacuum where in the photocurrent decreases even during steady illumination.
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Schedule a callMore From: Proceedings of the National Academy of Sciences, India Section A: Physical Sciences
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