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US 8,798,961 B2Granted
High speed spectrometer
AssigneeFirst Solar, Inc.
InventorsBrady A. Johnson, Dmitriy Marinskiy
Life of this patent
Estimating the term…
Abstract
A system for measuring quantum efficiency in a sample photovoltaic cell may include a Fourier transform infrared spectrometer. One or more light source for illuminating the photovoltaic cell in a wavelength range of interest are provided.
Claims30
A system for measuring quantum efficiency in a photovoltaic cell, the system comprising:
- a photovoltaic cell;
- a Fourier transform infrared spectrometer comprising at least a white light source and a secondary light source for illuminating the photovoltaic cell;
- a photocurrent analyzer electrically connected to the photovoltaic cell by an electrical conductor and configured to receive a photocurrent corresponding to a wavelength range;
- and
- a processor configured to analyze photocurrent in the wavelength range.
2 more elements
A method for testing quantum efficiency in a photovoltaic cell, the method comprising:
- performing a Fourier transform on beams of light emitted from a white light source and a secondary light source;
- directing the Fourier-transformed beams of light toward a photovoltaic cell to generate a photocurrent corresponding to a wavelength range;
- conducting the photocurrent from the photovoltaic cell to an analog-to-digital converter to produce a digital signal corresponding to the wavelength range;
- and
- performing a reverse Fourier transform on the digital signal to obtain the photocurrent versus wavelength curve in the entire wavelength range.
2 more elements
Dependencies are inferred from the claim text.