| Title | Impurity-Dependent Photoresponse Properties in Single CdSe Nanobelt Photodetectors |
| Authors | Wu, Peicai Dai, Yu Sun, Tuo Ye, Yu Meng, Hu Fang, Xiaolong Yu, Bin Dai, Lun |
| Affiliation | Peking Univ, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China. Peking Univ, Sch Phys, Beijing 100871, Peoples R China. |
| Keywords | impurity photodetector photoresponse CdSe nanobelt nanostructure ZNO NANOWIRE FIELD-EMITTERS INTERNAL GAIN PHOTOCONDUCTIVITY ENHANCEMENT NANORIBBON |
| Issue Date | 2011 |
| Publisher | acs applied materials interfaces |
| Citation | ACS APPLIED MATERIALS & INTERFACES.2011,3,(6),1859-1864. |
| Abstract | Impurity-dependent photoresponse properties of semiconductor nanostructures are studied for the first time in the photodetectors (PDs) made from intrinsic (i-) and extrinsic n-type single CdSe nanobelts (NBs). Both ohmic and Schottky contact based CdSe NB PDs were studied. The sizes of i- and n-NBs were purposely chosen to be nearly identical to minimize the size-dependent effect. Our experimental results demonstrate that i-CdSe NBs are more suitable for fast and sensitive PD applications, while n-CdSe NBs are more advantageous for high-gain PD applications. The different photo response properties result mainly from the impurity induced traps inside the CdSe NBs. This conclusion can be applicable to other semiconductor nanomaterials. Moreover, we have achieved short response/recovery times (similar to 15/31 mu s) and a high photosensitivity (similar to 100) simultaneously from the i-CdSe NB PDs under 3500 Hz pulsed illumination. This may be the best reported result so far in the effort of getting fast speed and high photosensitivity simultaneously from nanostructure based PDs for practical applications. |
| URI | http://hdl.handle.net/20.500.11897/194217 |
| ISSN | 1944-8244 |
| DOI | 10.1021/am200043c |
| Indexed | SCI(E) EI PubMed |
| Appears in Collections: | 人工微结构和介观物理国家重点实验室 |
