InGaP electron spectrometer for high temperature environments.

Area of Science:

• Semiconductor physics
• Detector development
• Spectroscopy

Background:

• Electron spectrometers are crucial for analyzing particle energies.
• High-temperature environments pose challenges for conventional detector materials.
• Indium Gallium Phosphide (InGaP) offers potential for robust electronic devices.

Purpose of the Study:

• To investigate the performance of an InGaP p+-i-n+ mesa photodiode as a temperature-tolerant electron spectrometer.
• To evaluate the InGaP detector's response across a wide temperature range (20°C to 100°C).
• To assess the feasibility of using this detector for space and high-temperature terrestrial applications.

Main Methods:

• Fabrication and characterization of a 200 μm diameter InGaP p+-i-n+ mesa photodiode with a 5 μm depletion layer.
• Performance analysis under dark conditions and beta particle (63Ni source) illumination.
• Integration with a low-noise charge-sensitive preamplifier to create a particle counting electron spectrometer.
• Collection of beta spectra at various temperatures (up to 100°C) with reverse bias (5V).
• Comparison of experimental spectra with Monte Carlo simulations at 20°C.

Main Results:

• The InGaP photodiode functioned as a particle counting electron spectrometer up to 100°C.
• Experimental beta spectra showed good agreement with Monte Carlo predictions at 20°C.
• The device demonstrated stable operation within the tested temperature range.

Conclusions:

• The InGaP photodiode is a viable component for developing temperature-tolerant electron spectrometers.
• This technology is suitable for demanding environments, including space missions (e.g., Mercury, Europa) and high-radiation areas.
• The developed spectrometer has potential for both space exploration and terrestrial scientific applications.