Quantum Yield of Reflection Mode Varied Doping GaN Photocathode

Photo-induced Doping in GaN Epilayers with Graphene Quantum Dots.

We demonstrate a new doping scheme where photo-induced carriers from graphene quantum dots (GQDs) can be injected into GaN and greatly enhance photoluminescence (PL) in GaN epilayers. An 8.3-fold enhancement of PL in GaN is observed after the doping. On the basis of time-resolved PL studies, the PL enhancement is attributed to the carrier transfer from GQDs to GaN. Such a carrier transfer proce...

Modeling of High Temperature GaN Quantum Dot Infrared Photodetectors

In this paper, we present calculations for different parameters of quantum dot infrared photodetectors. We considered a structure which includes quantum dots with large conduction-band-offset materials (GaN/AlGaN). Single band effective mass approximation has been applied in order to calculate the electronic structure. Throughout the modeling, we tried to consider the limiting factors which dec...

Role of hydrogen in doping of GaN

We investigate the interactions between hydrogen and dopant impurities in GaN, using state-of-the-art first-principles calculations. Our results for energetics and migration reveal a fundamental difference in the behavior of hydrogen between p-type and n-type material; in particular, we explain why hydrogen concentrations in n-type GaN are low, and why hydrogen has a beneficial effect on accept...

Theoretical analysis of modulation doping effects on intersubband transition properties of semipolar AlGaN/GaN quantum well

INFLUENCE OF Si-DOPING ON CARRIER LOCALIZATION OF MOCVD-GROWN InGaN/GaN MULTIPLE QUANTUM WELLS

We have systematically studied the influence of Si doping on the optical characteristics of InGaN/GaN multiple quantum wells (MQWs) using photoluminescence (PL), PL excitation (PLE), and time-resolved PL spectroscopy combined with studies of optically pumped stimulated emission and structural properties from these materials. The MQWs were grown on 1.8-μm-thick GaN layers on c-plane sapphire fil...