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A Very Thin MCT Film in HDVIP Achieves High Absorption
Lingwei Jiang1,2, Changhong Sun1, Xiaoning Hu1
1National Key Laboratory of Infrared Detection Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China.
Sensors (Basel, Switzerland)
|June 27, 2025
Summary
Optimizing mercury cadmium telluride (MCT) layer thickness in high-density vertically integrated photodiodes enhances infrared absorption. This thinner MCT film improves performance and manufacturability for advanced photodetectors.
Area of Science:
- Optoelectronics
- Materials Science
- Semiconductor Physics
Background:
- Traditional flip-chip bonded focal plane arrays face limitations with mercury cadmium telluride (MCT) layer thickness.
- In high-density vertically integrated photodiode (HDVIP) technology, MCT layer thickness critically impacts photon absorption, dark current, and manufacturability.
Purpose of the Study:
- To investigate photonic crystal resonances and coherent perfect absorption (CPA) in thin MCT layers within HDVIP structures.
- To optimize the loop-hole photodiode device structure for enhanced infrared absorption.
Main Methods:
- Utilized COMSOL Multiphysics® 4.3b for simulating photonic crystal resonances and CPA.
- Investigated the effect of MCT layer thickness on absorption efficiency and device performance.
Main Results:
- Achieved over 95% infrared absorption in the 8 µm-10 µm range for a 1.5 µm-3 µm thick MCT (Hg1-xCdxTe, x = 0.225) layer.
- Demonstrated CPA effect in the optimized loop-hole photodiode structure.
Conclusions:
- Thin MCT films enable high infrared absorption via CPA in HDVIP focal plane technology.
- Reduced MCT thickness decreases dark current and simplifies fabrication processes for loop-hole photodiodes.
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