We demonstrate a novel, feasible strategy for practical application of one-dimensional photodetectors by integrating a carbon nanotube and TiO
2 in a core鈥搒hell 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 脳 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鈥搗isible). The concept using metallic core oxide鈥搒hell geometry with radial Schottky barriers holds potential to pave a new way to realize nanostructured photodetectors for practical use.
Keywords:
core鈭抯hell; TiO2; carbon nanotube; photodetector; photoresponse time