title: Size-controllable synthesis of Bi/Bi2O3 heterojunction nanoparticles using pulsed Nd:YAG laser deposition and metal-semiconductor-heterojunction-assisted photoluminescence.
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).
authors.affiliation: Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan. ronma@mail.ndhu.edu.tw.
authors.forename: Ranjit A
authors.initials: RA
authors.lastname: Patil
authors.affiliation: Department of Materials Science and Engineering, National Dong Hwa University, Hualien 97401, Taiwan.
authors.forename: Mao-Kuo
authors.initials: MK
authors.lastname: Wei
authors.affiliation: Department of Physics, Tamkang University, Tamsui, New Taipei City 25137, Taiwan.
authors.forename: P-H
authors.initials: PH
authors.lastname: Yeh
authors.affiliation: Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan. ronma@mail.ndhu.edu.tw.
authors.forename: Jyun-Bo
authors.initials: JB
authors.lastname: Liang
authors.affiliation: Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan. ronma@mail.ndhu.edu.tw.
authors.forename: Wan-Ting
authors.initials: WT
authors.lastname: Gao
authors.affiliation: Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.
authors.forename: Jin-Han
authors.initials: JH
authors.lastname: Lin
authors.affiliation: Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.
authors.forename: Yung
authors.initials: Y
authors.lastname: Liou
authors.affiliation: Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan. ronma@mail.ndhu.edu.tw.
authors.forename: Yuan-Ron
authors.initials: YR
authors.lastname: Ma