Light-triggered two-dimensional lateral homogeneous p-n diodes for opto-electrical interconnection circuits

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Opto-electrical interconnection circuits aim to control device performance using light as an external stimulus.
• Achieving light-triggered p-n junctions in two-dimensional materials is crucial for advanced electronic devices.

Purpose of the Study:

• To investigate the light-induced formation of p-n junctions in black phosphorus (BP) conduction channels.
• To demonstrate the flexible switching of BP transistors between resistor and p-n diode states using light.
• To explore the potential of this technology for novel optoelectronic devices.

Main Methods:

• Fabrication of semi-photo-gate transistor (SPGT) devices utilizing black phosphorus (BP) and cadmium sulfide (CdS).
• Modulation of charge carrier type and density in BP by light illumination via a CdS photo-gate.
• Characterization of device performance under varying light conditions, including photoresponsivity and photovoltaic properties.

Main Results:

• Light illumination induces p-n junction formation in BP conduction channels.
• BP transistors exhibit flexible switching between resistor and p-n diode states with ultra-low threshold light power.
• The devices demonstrate ultra-high photoresponsivity and photovoltaic properties, enabling light-to-power conversion.
• The SPGT architecture is adaptable for other ambipolar semiconductors like WSe2 and MoTe2.

Conclusions:

• Light-triggered, all-in-one lateral homogeneous p-n junctions can be realized in 2D materials.
• This technology offers a new pathway for developing novel optoelectronic devices with ultra-low energy consumption.
• The universal applicability to various ambipolar semiconductors highlights significant potential for diverse applications.