Short-Wave Infrared Optoelectronics with Colloidal CdHgSe/ZnCdS Core/Shell Nanoplatelets

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Colloidal semiconductor nanocrystals (NCs) are crucial for optoelectronic applications.
• Semiconductor nanoplatelets (NPLs) offer precise structural control and uniform thickness.
• Advancements rely on synthetic chemistry, surface tuning, and device architecture.

Purpose of the Study:

• To demonstrate the application of core/shell CdHgSe/ZnCdS NPLs in optoelectronics.
• To explore the utility of these NPLs in the short-wave infrared (SWIR) spectral range.
• To fabricate and assess both light-emitting diodes (LEDs) and photodetectors using the same NPLs.

Main Methods:

• Synthesis of core/shell CdHgSe/ZnCdS semiconductor nanoplatelets.
• Fabrication of optoelectronic devices including LEDs and photodetectors.
• Characterization of device performance in the SWIR spectral range.

Main Results:

• Achieved external quantum efficiency of 7.5% at 1280 nm and 3.8% at 1550 nm for electroluminescence.
• Demonstrated a responsivity of 0.24 A W⁻¹ at 1200 nm for photodetectors.
• Validated the dual functionality of the NPLs for both emission and detection.

Conclusions:

• Core/shell CdHgSe/ZnCdS NPLs are versatile for SWIR optoelectronic applications.
• The NPLs enable efficient fabrication of both LEDs and photodetectors.
• These findings highlight the potential of NPLs for advanced optoelectronic devices.