Laser tuned large position-dependent tunneling detection dominated by interface states in silicon based...

Area of Science:

• Semiconductor Physics
• Materials Science
• Optoelectronics

Background:

• Tunneling current is a quantum mechanical phenomenon crucial in semiconductor devices.
• Traditional tunneling research focuses on voltage and magnetic field influences.
• Interface states significantly impact device performance but are complex to control.

Purpose of the Study:

• To investigate laser-induced amplification of tunneling current in a SiO2/p-Si/SiO2 structure.
• To explore the role of interface states in laser-tuned tunneling.
• To demonstrate a novel light and position-sensitive tunneling detection method.

Main Methods:

• Fabrication of a silicon dioxide (50nm)/p-Si/silicon dioxide heterostructure.
• Measurement of tunneling current under dark and low-intensity laser irradiation (5mW).
• Analysis of position-dependent tunneling current amplification and its correlation with interface states.

Main Results:

• Observed a significant amplification (over 250 times) of tunneling current under laser irradiation compared to dark conditions.
• Demonstrated that the amplified tunneling effect is position-dependent with centimeter-level adjustability.
• Established a strong correlation between laser-tuned amplification and the presence of interface states at the SiO2/p-Si interface.

Conclusions:

• Interface states in SiO2/p-Si structures can collect and control light-induced carriers, enabling laser-tuned tunneling.
• A novel tunneling detection mechanism based on laser amplification and interface states has been demonstrated.
• This work suggests a new pathway for developing light and position-sensitive tunneling devices.