Towards Efficient Electrically-Driven Deep UVC Lasing: Challenges and Opportunities

Area of Science:

• Materials Science
• Semiconductor Physics
• Optoelectronics

Background:

• Deep-ultraviolet (DUV) laser diodes (LDs) are crucial for various applications.
• Performance limitations hinder widespread adoption of DUV LDs.
• Intrinsic properties of AlGaN semiconductors present significant challenges.

Purpose of the Study:

• To review major issues affecting DUV LD performance.
• To discuss approaches for improving DUV LD performance.
• To highlight the role of AlGaN material properties.

Main Methods:

• Review of existing literature on DUV LDs.
• Analysis of factors limiting device performance, including doping and dislocations.
• Discussion of novel technological and design approaches.

Main Results:

• Threading dislocations increase laser threshold current.
• Heavy doping in AlGaN alloys is limited.
• Electron leakage and non-uniform hole injection impact active region performance.
• AlGaN material properties are fundamental to DUV LD limitations.

Conclusions:

• Addressing n- and p-type doping and threading dislocation density is critical.
• Novel methods like face-to-face annealing and polarization doping show promise.
• Understanding AlGaN properties is essential for future DUV LD development.