研究目的
Investigating the electrothermal modeling of cryogenic silicon bolometers for cosmic microwave background polarimetric observation.
研究成果
The study demonstrates that cooled silicon bolometer pixels can achieve very high performances for CMB radiation polarization detection, with a responsivity of around 1011 V/W and a total NEP better than 10?18 W/Hz1/2 in the range of 50–100 mK. However, the nonohmic behavior of the thermometers at high bias currents can degrade their sensitivity, requiring a careful optimization of the bias current.
研究不足
The study is limited by the nonohmic behavior of the doped silicon thermometers at very low temperatures under high bias currents, which can degrade the thermometer sensitivity. A trade-off has to be found between Joule heating and electro-optical performances.
1：Experimental Design and Method Selection:
The study involves electrothermal modeling of cryogenic silicon bolometers with specific pixel pitches for cosmic microwave background polarimetric observation. The hot electron model (HEM) is used to describe the nonohmic behavior of doped silicon thermometers at very low temperatures under high bias currents.
2：Sample Selection and Data Sources:
The thermometers are fabricated on 200 mm <111> p-type SOI wafers substrates, ion implanted with phosphorus and compensated with boron.
3：List of Experimental Equipment and Materials:
The study uses conventional 3He/4He dilution refrigerators for electrical measurements at low temperature.
4：Experimental Procedures and Operational Workflow:
The electrical resistance of the thermometers is measured as a function of the bias power for several temperatures. The COMSOL software is used for thermoelectric simulations to derive the responsivity and NEP performances.
5：Data Analysis Methods:
The data is analyzed using the HEM to compute the thermometer sensitivity and to simulate the bolometer performance.
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