Supersensitive, ultrafast, and broad-band light-harvesting scheme employing carbon nanotube/TiO2 core-shell nanowire geometry.
We demonstrate a novel, feasible strategy for practical application of one-dimensional photodetectors by integrating a carbon nanotube and TiO(2) in a core-shell fashion for breaking the compromise between the photogain and the response/recovery speed. Radial Schottky barriers between carbon nanotube cores and TiO(2) shells and surface states at TiO(2) shell surface regulate electron transport and also facilitate the separation of photogenerated electrons and holes, leading to ultrahigh photogain (G = 1.4 × 10(4)) and the ultrashort response/recovery times (4.3/10.2 ms). Additionally, radial Schottky junction and defect band absorption broaden the detection range (UV-visible). The concept using metallic core oxide-shell geometry with radial Schottky barriers holds potential to pave a new way to realize nanostructured photodetectors for practical use.
Department of Electrical Engineering & Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan.
Chia-Yang
CY
Hsu
Der-Hsien
DH
Lien
Sheng-Yi
SY
Lu
Cheng-Ying
CY
Chen
Chen-Fang
CF
Kang
Yu-Lun
YL
Chueh
Wen-Kuang
WK
Hsu
Jr-Hau
JH
He
D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008422:Materials Testing; D008839:Microelectrodes; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure; D010316:Particle Size; D010783:Photometry / Q000295:instrumentation*; D012666:Semiconductors; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects
D037742:Nanotubes, Carbon; C009495:titanium dioxide; D014025:Titanium