Using the Monte Carlo method,a type of semiconductor nano-device called self-switching device (SSD),which has diode-like I-V characteristics,was simulated.After analyzing the microscopic transport behavior of the carr...Using the Monte Carlo method,a type of semiconductor nano-device called self-switching device (SSD),which has diode-like I-V characteristics,was simulated.After analyzing the microscopic transport behavior of the carriers,we show that the ballistic effects exist in the SSDs when the channel length of the device is extremely short (～120 nm).Furthermore,we show that the ballistic effect doubles the average drift velocity of the carriers (to ～6.0×107 cm/s) in short-channel SSDs,which decreases the transit time.This implies that when the dimensions are decreased to nanoscale length,the SSD can operate much faster because the ballistic effect increases the operation speed of the device.Moreover,because of the ballistic transport,the energy efficiency may also be improved.展开更多
Fast neutron detection is a subject of great relevance in modem nuclear science and engineering, in particular, with the recent advances in nuclear fusion research, detection of fast neutron became a key issue. Nuclea...Fast neutron detection is a subject of great relevance in modem nuclear science and engineering, in particular, with the recent advances in nuclear fusion research, detection of fast neutron became a key issue. Nuclear properties of carbon are of special interest due to its relatively high capture cross section for fast neutrons. Devices made of silicon carbide and diamond are based on these properties, and so are being developed to be used with the proper wiring. In addition, in recent years carbon nano-tubes unveiled their electrical and mechamical properties, which can be exploited for neutron detection. In this work, we use MCNP5 Monte Carlo code to analyze the carbon nuclear properties and discuss the way nano-tubes can be used for fast neutron detection.展开更多
基金supported by the FOK YING TONG Education Foundation (122004)the Natural Science Foundation of Guangdong Province,China (9451063101002244,10151063101000025)
文摘Using the Monte Carlo method,a type of semiconductor nano-device called self-switching device (SSD),which has diode-like I-V characteristics,was simulated.After analyzing the microscopic transport behavior of the carriers,we show that the ballistic effects exist in the SSDs when the channel length of the device is extremely short (～120 nm).Furthermore,we show that the ballistic effect doubles the average drift velocity of the carriers (to ～6.0×107 cm/s) in short-channel SSDs,which decreases the transit time.This implies that when the dimensions are decreased to nanoscale length,the SSD can operate much faster because the ballistic effect increases the operation speed of the device.Moreover,because of the ballistic transport,the energy efficiency may also be improved.
文摘Fast neutron detection is a subject of great relevance in modem nuclear science and engineering, in particular, with the recent advances in nuclear fusion research, detection of fast neutron became a key issue. Nuclear properties of carbon are of special interest due to its relatively high capture cross section for fast neutrons. Devices made of silicon carbide and diamond are based on these properties, and so are being developed to be used with the proper wiring. In addition, in recent years carbon nano-tubes unveiled their electrical and mechamical properties, which can be exploited for neutron detection. In this work, we use MCNP5 Monte Carlo code to analyze the carbon nuclear properties and discuss the way nano-tubes can be used for fast neutron detection.
