研究目的
Demonstration of quantum cascade detectors (QCDs) based on ZnO/ZnMgO quantum wells (QWs) grown by molecular beam epitaxy on an m-plane ZnO substrate.
研究成果
The study successfully demonstrated QCDs based on ZnO/ZnMgO QWs with ISB absorption peaked at a 3 lm wavelength. The photocurrent spectroscopy revealed a photocurrent resonance at a 2.8 lm wavelength, persisting up to room temperature. The peak responsivity was calibrated at 0.15 mA/W, allowing the estimation of the electron transfer efficiency between successive periods at 1.15%. The results suggest potential for improvement by optimizing the design and growth of the QCD structure.
研究不足
The electron transfer efficiency is rather low (1.15%) compared to the best results published so far, attributed to Mg content fluctuations in the barrier layers and band bending induced by the doping of the active well.
1：Experimental Design and Method Selection:
The study involves the design and fabrication of QCDs based on ZnO/ZnMgO QWs grown by molecular beam epitaxy (MBE) on an m-plane ZnO substrate. The design targets a 3.7 lm wavelength for ISB absorption.
2：7 lm wavelength for ISB absorption.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The sample was grown on 10 (cid:2) 10 mm m-oriented ZnO substrates. The layer sequence was grown in a MBE system equipped with zinc (Zn) and magnesium (Mg) cells and one gallium (Ga) cell for n-type doping.
3：List of Experimental Equipment and Materials:
MBE system (RIBER, Epineat), Bruker Vertex 70 FTIR spectrometer, reactive ion etching plasma for mesa etching, H2O2 for device treatment.
4：Experimental Procedures and Operational Workflow:
The sample was processed into 260 square mesas with sizes ranging from 10 (cid:2) 10 lm2 to 100 (cid:2) 100 lm2. The I-V characteristics and photocurrent spectroscopy were performed to evaluate the device performance.
5：The I-V characteristics and photocurrent spectroscopy were performed to evaluate the device performance.
Data Analysis Methods:
5. Data Analysis Methods: The responsivity was calibrated under illumination by a black-body source and a narrow band-pass filter. The transfer efficiency of electrons between successive periods was estimated based on the responsivity.
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