Kim, Eun Kyu Park, Ji Sun Kim, Jin Soak Han, Il Ki Song, Jin Dong 2024-01-21T03:03:44Z 2024-01-21T03:03:44Z 2021-09-01 2006-06 0021-4922 https://pubs.kist.re.kr/handle/201004/135491 Deep-level transient spectroscopy (DLTS) was performed to investigate the energy levels introduced inside quantum wells in the active region of a quantum cascade laser (QCL) structure. To form a simple active region, we prepared samples with GaAs/AlGaAs three and single-quantum-well (QW) structures. At least two QW levels were observed from the DLTS spectra for a three-QW structure and their activation energies were calculated to be approximaely 0.11-0.13 eV for QW1 and 0.20-0.22 eV for QW2. The positions of energy levels in multi quantum wells were slightly shifted upward by the applied electric field. In the case of a single QW, an activation energy of 0.08eV was obtained. English INST PURE APPLIED PHYSICS BOUND-TO-CONTINUUM ELECTROLUMINESCENCE SPECTROSCOPY Electrical characterization of GaAs/AlGaAs multi-quantum wells for quantum cascade laser Article 10.1143/JJAP.45.5478 1 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, v.45, no.6B, pp.5478 - 5480 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 45 6B 5478 5480 scie scopus 000240882800025 2-s2.0-33745670635 Physics, Applied Physics Article; Proceedings Paper BOUND-TO-CONTINUUM ELECTROLUMINESCENCE SPECTROSCOPY quantum cascade laser multi-quantum wells deep level transient spectroscopy (DLTS) GaAs/AlGaAs