| Proj No. | A2001-251 |
| Title | 2D material based high performance photodetectors (b) |
| Summary | Since the discovery of graphene in 2004, intensive research has been devoted to this two-dimensional (2D) carbon atom lattice arranged in a honeycomb structure of hexagons. Due to some unique properties, graphene has been developed in many applications especially has more advantages as a sensor. First, graphene is a strictly two-dimensional material and, as such, has its whole volume exposed to surface adsorbers, which maximizes their effect. Second, graphene is highly conductive, exhibiting metallic conductivity and, hence, low Johnson noise even in the limit of no charge carriers, where a few extra electrons can cause notable relative changes in carrier concentration. Third, graphene allows four-probe measurements on a single crystal device with electrical contacts that are ohmic and have low resistance. All of these features contribute to make a unique combination that maximizes the signal-to-noise ratio to a level sufficient for detecting changes in a local concentration by less than one electron charge at room temperature. This proposal will use mechanical exfoliation method and following optical lithography to fabricate graphene based field-effect transistor. And then to investigate the factors which influence the sensor performance. |
| Supervisor | Prof Wang Qijie (Loc:S1 > S1 B1C > S1 B1C 90, Ext: +65 67905431) |
| Co-Supervisor | - |
| RI Co-Supervisor | - |
| Lab | Characterization (Loc: S1-B2c-20) |
| Single/Group: | Single |
| Area: | Microelectronics and Biomedical Electronics |
| ISP/RI/SMP/SCP?: |