Enhancement of hole injection for nitride-based light-emitting devices
  A novel device design is proposed for a strong enhancement of hole injection current in nitride-based light-emitting heterostructures. Preliminary calculations show orders of magnitude increase in injected hole current when using the proposed superlattice hole injector device based on the real-space transfer concept. 
S. M. Komirenko, K. W. Kim, V. A. Kochelap, and J. M. Zavada