MWIR and LWIR Time-Resolved Photoluminescence System
Abstract
Type-II superlattices (T2SL) and SiGeSn alloys are promising low-cost and high-performance materials considered as attractive alternatives to the traditional HgCdTe for IR photodetector applications. Significant progress, such as i) much increased minority carrier lifetime in InAs/InAsSb T2SL materials and thus substantially improved photodetector performance, and ii) extended cut-off bandgaps of GeSn alloys beyond 3 µm, have been demonstrated by ASU, the University of Arkansas and their collaborators at other institutions like ARL. The main goal of this proposed DURIP program is to build a state-of-the-art time-resolved photoluminescence system in the mid-wavelength infrared and long-wavelength infrared range, i.e. 2 ~ 12 µm. The system will be used to support the following programs and research efforts: i) two newly awarded ARO and ARL programs to study the carrier dynamics and hole transport in narrow-gap semiconductors such as InAs/InAsSb T2SL and devices; ii) a new AFOSR MURI program to study narrow-gap SiGeSn alloys, including their growth, defects, and application in IR photodetectors. This time-resolved photoluminescence system will also be integrated with our existing FTIR optical spectroscopy setup to provide support to many other faculty and research programs at ASU and graduate student education. For instance, the comprehensive optical characterization facilities in the PIÕs labs have been used in several graduate courses to train several dozen graduate students in the past years. We anticipate that this project will enable us to carry out some unique experiments to understand important fundamental physics of emerging narrow-gap semiconductors and devices. The system will benefit additional dozens of PhD students and postdocs over the next 10 ~ 15 years, and strengthen the established collaborations between ASU and other universities as well as research institutions like ARL and AFRL.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 09, 2020
- Source ID
- W911NF2010053
Entities
People
- Yong-hang Zhang
Organizations
- Arizona State University
- Army Contracting Command
- United States Army