Low-Noise, UV-to-SWIR Broadband Photodiodes for Large-Format Focal Plane Array Sensors

Broadband focal plane arrays, operating in UV-to-SWIR wavelength range, are required for atmospheric monitoring of greenhouse gases. Currently, separate image sensors are used for different spectral sub-bands: GaN for UV, Si for visible, and InGaAs for SWIR, requiring expensive component-level integration for hyper-spectral imaging. Also, the size of the InGaAs focal plane arrays is currently limited by the InP substrate area. We propose to develop a 640 x 512 UV-to-SWIR focal plane array sensor using GaAs substrate having following photodiode performance: (1) Cut-on Wavelength = 0.25 micron; (2) Cut-off Wavelength = 2.5 micron; (3) RoA > 35 Ohm-cm^2 at 300K; and (4) Quantum Eficiency > 30% in UV (0.25 to 0.4 micron), > 80% in Visible (0.4 to 0.9 micron), and > 70% in IR (0.9 to 2.5 micron) subbands. Based on P.I.'s experience on SCIAMACHY, this project will enable one image sensor for 8 spectroscopic channels currently orbiting on European Space Agency's ENVISAT.

Potential Non-NASA commercial applications for large-format UV-to-SWIR focal plane array sensors include: 1. Pollution monitoring for automobiles, refineries, etc. 2. Bio-medical imaging and spectroscopy 3. Jet engine development 4. Industrial process control in pharmaceutical, food-processing, and petrochemical industries 5. Crop monitoring 6. Mineral detection

Potential NASA applications for large-format UV-to-SWIR focal plane array sensors include: 1. Space-based atmospheric monitoring of ozone and greenhouse gases 2. Weather observation 3. Hyper-spectral sensors for planetary missions

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