Open AccessUltraviolet photodetector using pn junction formed by transferrable hollow n-TiO_2 nano-spheres monolayer
Author(s) -
TaeHyun Yang,
Seong Jin Park,
Taek G.O.N. Kim,
Dong Bin Shin,
KyungDo Suh,
Jinsub Park
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.030843
Subject(s) - monolayer , materials science , anatase , polydimethylsiloxane , ultraviolet , polyvinyl alcohol , photodetector , substrate (aquarium) , rutile , nanotechnology , thin film , nanoparticle , optoelectronics , chemical engineering , optics , photocatalysis , composite material , chemistry , organic chemistry , oceanography , physics , geology , engineering , catalysis
We report an ultraviolet (UV) photodetector with a universally transferable monolayer film with ordered hollow TiO 2 spheres on p-GaN. After forming a TiO 2 monolayer film by unidirectional rubbing of hollow TiO 2 spheres on a polydimethylsiloxane (PDMS) supporting plate, we used a 5% polyvinyl alcohol (PVA) aqueous solution to transfer the film onto the target substrate. The PVA/TiO 2 monolayer film was detached from the PDMS film and transferred to the p-GaN/Al 2 O 3 substrate. To investigate the effects of crystallized phases of the TiO 2 hollow spheres, anatase and rutile TiO 2 sphere monolayers prepared by combining template synthesis and thermal treatment. The responsiveness of the UV photodetectors using anatase and rutile hollow n-TiO 2 monolayer/p-GaN was 0.203 A/W at 312 nm and 0.093 A/W at 327 nm, respectively.