Negatively charged excitons and the optical properties of modulation-doped quantum wells |
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| Affiliation: | 1. State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People''s Republic of China;2. College of Information Science and Electronic Engineering, Zhejiang University, People''s Republic of China;3. Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People''s Republic of China;1. Department of Electrical and Computer Engineering, The University of North Carolina at Charlotte, Charlotte, NC 28223, USA;2. Department of Applied Physical Sciences, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA;3. School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ 85287, USA;4. Materials Physics and Application Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;5. Department of Chemical and Biomolecular Engineering and Department of Material Science and Nanoengineering, Rice University, Houston, TX 77005, USA;6. Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Institute for Advanced Energy Materials, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an 710062, China;7. National Renewable Energy Laboratory, Golden, CO 80401, USA;1. Centre for Solar Energy Research, Faculty of Science and Engineering, Swansea University, OpTIC Centre, St. Asaph Business Park, St. Asaph, LL17 0JD, UK;2. Loughborough Surface Analysis (LSA) Ltd., Pegasus House, 5 Prince William Road, Loughborough, LE11 5GU, UK;3. SPECIFIC, College of Engineering, Swansea University Bay Campus, Fabian Way, Swansea, SA1 8EN, UK;4. Centre for Renewable Energy Systems Technology, Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, LE11 3TU, UK;5. National Renewable Energy Laboratory (NREL), 16253 Denver West Parkway, Golden, CO, 80401, USA;6. Colorado School of Mines, 1500 Illinois St., Golden, CO, 80401, USA;1. Laboratory of Materials Physics and Its Applications, University of M''sila, 28000 M''sila, Algeria;2. Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia;3. Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia;4. National Centre for Nanotechnology, King Abdulaziz City for Science and Technology (KACST), P.O. Box 6086, Riyadh 11442, Saudi Arabia |
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| Abstract: | Optical and magneto-optical properties are studied for II-VI semiconductor multiple quantum wells (MQWs) doped with donors in the barriers to give electron concentrations of 2 1010 to 6 1011 cm-2 in the well layers. Following on from the recent identification of negatively charged excitons X- (two electrons bound to one hole) in CdTe/Cd1-xZnxTe MQWs, this paper presents more specifically the circular polarisation of the luminescence associated with X- and with the normal exciton X (one electron and one hole) in this type of structure. Very similar magneto-optical properties are observed for modulation doped Zn0.9Cd0.1Se/ZnSe MQWs, and X- is identified in these wells with a binding energy as large as 7 meV for the second electron at 50Å, well-width. |
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