Dual-barrier GeSn quantum-well lasers with operation up to 150 K
Abstract
GeSn/SiGeSn quantum wells (QWs) have been investigated for the development of GeSn-based lasers. Barrier/well configurations including GeSn/GeSn and SiGeSn/GeSn were grown and characterized to evaluate carrier confinement and collection efficiency. In our previous work, a dual-barrier design (SiGeSn barrier/GeSn barrier/GeSn well) exhibited improved carrier collection efficiency for a GeSn single QW structure compared with a single-barrier configuration; however, no lasing had been reported from dual QW devices to date. Here, we report lasing from a GeSn dual-barrier single QW structure up to 140 K, with a threshold of 67 kW/cm2 at 77 K, representing a substantial threshold reduction. In addition, a 4-QW laser employing the same dual-barrier design demonstrates a clearly reduced threshold of 50 kW/cm2 at 77 K and a slightly increased maximum operating temperature of 150 K. The lower lasing threshold is attributed to decreased average carrier concentration in each well that improves the differential gain and the reduced Auger recombination rate.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (11)
Sudip Acharya
Materials Science and Engineering, University of Arkansas 1 , Fayetteville, Arkansas 72701,
Kushal Dahal
Materials Science and Engineering, University of Arkansas 1 , Fayetteville, Arkansas 72701,
Enbo Yang
Department of Electrical Engineering and Computer Science, University of Arkansas 2 , Fayetteville, Arkansas 72710,
Xiaoxin Wang
Xuehuan Ma
Department of Electrical Engineering and Computer Science, University of Arkansas 2 , Fayetteville, Arkansas 72710,
Quang Minh Thai
Department of Electrical Engineering and Computer Science, University of Arkansas 2 , Fayetteville, Arkansas 72710,
Hryhorii Stanchu
Institute for Nanoscience and Engineering, University of Arkansas 4 , Fayetteville, Arkansas 72701,
Yunsheng Qiu
Department of Electrical Engineering and Computer Science, University of Arkansas 2 , Fayetteville, Arkansas 72710,
Jifeng Liu
Thayer School of Engineering, Dartmouth College 3 , Hanover, New Hampshire 03755,
Wei Du
Department of Urological Surgery Zhujiang Hospital Southern Medical University Guangzhou China
Shui-Qing Yu
Department of Electrical Engineering and Computer Science, University of Arkansas 2 , Fayetteville, Arkansas 72710,