High-speed quantum well infrared photodetctor based on intersubband transitions
The development of infrared (IR) detection technology has evolved significantly over the decades. Quantum Well Infrared Photodetectors (QWIPs) have emerged as a breakthrough in this field, leveraging intersubband transitions to achieve infrared photon absorption and electron transitions through quan...
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| Format: | Thesis-Master by Coursework |
| Language: | English |
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Nanyang Technological University
2024
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| Online Access: | https://hdl.handle.net/10356/178225 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The development of infrared (IR) detection technology has evolved significantly over the decades. Quantum Well Infrared Photodetectors (QWIPs) have emerged as a breakthrough in this field, leveraging intersubband transitions to achieve infrared photon absorption and electron transitions through quantum mechani- cal effects. This dissertation focuses on the fabrication and characterization of high-speed QWIPs based on intersubband transitions, with the aim of enhancing their response speed and detection efficiency. The research outlines a reliable method for fabricating QWIPs, involving epitaxial growth, active region defini- tion, mesa isolation, dielectric deposition, gold deposition, and polishing. The fabricated QWIPs were tested for their I-V characteristics, optical response, and high-speed behavior. Results demonstrated significant improvements in response speed, with a 3 dB cutoff frequency around 250 MHz at room temperature and up to 1.1 GHz under cryogenic conditions. These findings suggest that the developed high-speed QWIPs can be effectively integrated into commercial systems, thereby broadening the practical applications of infrared detection. |
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