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Room-Temperature Response Performance of Coupled Doped-Well Quantum Cascade Detectors with Array Structure
Jie Chen1,2, Fengwei Chen2, Xuemin Wang2
1Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Academy for Engineering & Technology, Fudan University, Shanghai 200438, China.
Nanomaterials (Basel, Switzerland)
|January 8, 2023
Summary
Researchers developed two quantum cascade detectors (QCDs) with different structures, achieving high detectivity at room temperature. A coupled doped-well design enhanced electron concentration and absorption, leading to superior performance for long-wave infrared detection.
Area of Science:
- Optoelectronics
- Semiconductor Physics
Background:
- Quantum cascade detectors (QCDs) performance is sensitive to energy level interactions and electron concentration.
- Optimizing QCD design is crucial for efficient infrared detection.
Purpose of the Study:
- To investigate the impact of energy level interaction and electron concentration on QCD response performance.
- To compare the performance of two different-structured array QCDs, including a coupled doped-well design.
- To enhance responsivity and detectivity for long-wave infrared (LWIR) detection.
Main Methods:
- Fabrication of two array quantum cascade detectors with distinct structures.
- Analysis of overlap integral (OI) and oscillator strength (OS) under varying applied biases.
- Characterization of electron redistribution and concentration within the cascade structure at room temperature.
Main Results:
- Detectivity reached 10^9 cm·Hz^1/2/W at room temperature for both structures.
- Energy level interactions were shown to influence response performance.
- The coupled doped-well structure exhibited higher room-temperature electron concentration and absorption efficiency.
- The coupled doped-well QCD demonstrated improved responsivity and detectivity.
Conclusions:
- Electron concentration and energy level interactions are key factors in QCD performance.
- The coupled doped-well structure offers a promising design for high-performance LWIR detectors.
- This study provides insights into QCD operational mechanisms and expands their application potential.
