| Autor: |
Mehedi Hasan, Anamika Shargen, M. M. A. Hakim, Salim Sazzad |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
2017 IEEE Region 10 Humanitarian Technology Conference (R10-HTC). |
| DOI: |
10.1109/r10-htc.2017.8288934 |
| Popis: |
We report a feasibility study of using silicon (Si) nanowire (NW) as a tunable biosensor through substrate bias arrangement. 75nm, 50nm and 25nm thick Si NWs having channel length of 1pm with doping concentrations of 1016/cm3, 1017/cm3 and 1018/cm3 respectively are investigated for different substrate voltages. For 75 nm and 50 nm thick NWs, application of substrate bias has been found to significantly affect NW's sub-threshold characteristics for body doping values of 1016/cm3, 1017/cm3 and a sub-threshold slope of 63 mV/dec can be achieved by using 7 V of substrate bias. For a body doping of 1018/cm3 an insignificant effect is observed with a degraded sub-threshold slope around 3402.2 mV/decade for all substrate voltages. This result indicate that 75 nm and 50 nm thick Si NWs can be used as tunable biosensor with a body doping of 1016/cm3 or 1017/cm3 but a body doping of 1018/cm3 is not suitable for viable biosensor operation. A drastic change in behavior is observed for 25 nm thick Si NW which exhibits excellent subthreshold slope around 64mV/dec for body doping values of 1016/cm3, 1017/cm3 and 1018/cm3 with an appropriate substrate voltage. This result implies that scaling of NW thickness at 25 nm and/or below would allow tunable biosensor design using both low and high doping with doping concentration within the range of 1016/cm3 to 1018/cm3 for single molecule detection. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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