Size-controllable synthesis of Bi/Bi2O3 heterojunction nanoparticles using pulsed Nd:YAG laser deposition and metal-semiconductor-heterojunction-assisted photoluminescence

Ranjit A Patil; Mao-Kuo Wei; P-H Yeh; Jyun-Bo Liang; Wan-Ting Gao; Jin-Han Lin; Yung Liou; Yuan-Ron Ma

doi:10.1039/c5nr08417b

Size-controllable synthesis of Bi/Bi2O3 heterojunction nanoparticles using pulsed Nd:YAG laser deposition and metal-semiconductor-heterojunction-assisted photoluminescence

Nanoscale. 2016 Feb 14;8(6):3565-71. doi: 10.1039/c5nr08417b.

Authors

Ranjit A Patil¹, Mao-Kuo Wei², P-H Yeh³, Jyun-Bo Liang¹, Wan-Ting Gao¹, Jin-Han Lin⁴, Yung Liou⁴, Yuan-Ron Ma¹

Affiliations

¹ Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan. ronma@mail.ndhu.edu.tw.
² Department of Materials Science and Engineering, National Dong Hwa University, Hualien 97401, Taiwan.
³ Department of Physics, Tamkang University, Tamsui, New Taipei City 25137, Taiwan.
⁴ Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.

PMID: 26804935
DOI: 10.1039/c5nr08417b

Abstract

We synthesized Bi/Bi2O3 heterojunction nanoparticles at various substrate temperatures using the pulsed laser deposition (PLD) technique with a pulsed Nd:YAG laser. The Bi/Bi2O3 heterojunction nanoparticles consisted of Bi nanoparticles and Bi2O3 surface layers. The average diameter of the Bi nanoparticles and the thickness of the Bi2O3 surface layer are linearly proportional to the substrate temperature. The heterojunctions between the Bi nanoparticles and Bi2O3 surface layers, which are the metal-semiconductor heterojunctions, can strongly enhance the photoluminescence (PL) of the Bi/Bi2O3 nanoparticles, because the metallic Bi nanoparticles can provide massive free Fermi-level electrons for the electron transitions in the Bi2O3 surface layers. The enhancement of PL emission at room temperature by metal-semiconductor-heterojunctions make the Bi/Bi2O3 heterojunction nanoparticles potential candidates for use in optoelectronic nanodevices, such as light-emitting diodes (LEDs) and laser diodes (LDs).

Publication types

Research Support, Non-U.S. Gov't