Growth and photoresponse study of PdO nanoflakes reactive-sputter deposited on SiO2

Chien Jung Huang*, Fu-Ming Pan, Hsiu Ying Chen, Li-Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

This study prepares PdO nanostructures on a SiO2 substrate by reactive-sputter deposition and examines photoresponse characteristics of the thin films. PdO thin films deposited at 25 °C is composed of bowed nanoflakes standing on the SiO2 substrate, which have a single-crystalline structure after thermal anneal at 400 °C. The 400 °C -annealed nanoflake thin film has a band gap energy in the red-light range (∼2.06 eV), and exhibits a very sensitive photoresponse upon the UV (365 nm) illumination. The high photoresponse sensitivity of the 400 °C -annealed nanoflake thin film is ascribed to a lower density of recombination centers and traps due to an excellent crystallinity and a high carrier extraction efficiency due to a low electrical resistivity. A slight decrease in the photocurrent density during the initial stage of the UV illumination is attributed to adsorption of O2- anions on the 400 °C -annealed nanoflakes.

Original languageEnglish
Article number053105
JournalJournal of Applied Physics
Volume108
Issue number5
DOIs
StatePublished - 1 Sep 2010

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