88 citations · 348 across the 8 of their papers we have counts for
8 papers
First principles study of hBN-AlN short-period superlattice heterostructures
Catalin D. Spataru, Mary H. Crawford, Andrew A. Allerman
We report a theoretical study of the structural, electronic and optical properties of hBN-AlN superlattice heterostructures (SL) using a first-principles approach based on standard…
Reflective Metal/Semiconductor Tunnel Junctions for Hole Injection in AlGaN UV LEDs
Yuewei Zhang, Sriram Krishnamoorthy, Fatih Akyol +6
In this work, we investigate the use of nanoscale polarization engineering to achieve efficient hole injection from metals to ultra-wide band gap AlGaN, and we show that UV-reflect…
Tunnel-injected sub-260 nm ultraviolet light emitting diodes
Yuewei Zhang, Sriram Krishnamoorthy, Fatih Akyol +5
We report on tunnel-injected deep ultraviolet light emitting diodes (UV LEDs) configured with a polarization engineered Al0.75Ga0.25N/ In0.2Ga0.8N tunnel junction structure. Tunnel…
Design and Demonstration of Ultra Wide Bandgap AlGaN Tunnel Junctions
Yuewei Zhang, Sriram Krishnamoorthy, Fatih Akyol +4
Ultra violet light emitting diodes (UV LEDs) face critical limitations in both the injection efficiency and light extraction efficiency due to the resistive and absorbing p-type co…
Design of P-Type Cladding Layers for Tunnel-Injected UVA Light Emitting Diodes
Yuewei Zhang, Sriram Krishnamoorthy, Fatih Akyol +4
We discuss the engineering of p-AlGaN cladding layers for achieving efficient tunnel-injected III-Nitride ultraviolet light emitting diodes (UV LEDs) in the UV-A spectral range. We…
Enhanced Light Extraction in Tunnel Junction Enabled Top Emitting UV LEDs
Yuewei Zhang, Andrew Allerman, Sriram Krishnamoorthy +4
The efficiency of ultra violet LEDs is critically limited by the absorption losses in p-type and metal layers. In this work, surface roughening based light extraction structures ar…