Grating Monochromator Quantum Efficiency Test Controller for Multijunction Cells
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Solution Overview
Problem
Current methods for determining quantum efficiency spectra of multijunction photovoltaic devices are either slow due to mechanical motion of grating monochromators or inaccurate due to limited wavelength resolution in LED-based techniques.
Innovation Solution
A method utilizing a grating monochromator that reduces the number of scans required, allowing for faster measurement while maintaining high accuracy by activating multiple bias light sources simultaneously during a single scan of the monochromator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional quantum efficiency spectroscopy methods are used with sequential bias light activation, then measurement accuracy is maintained, but measurement time increases significantly
Solution Approach 1:
The patent combines multiple bias light sources into a single integrated system that can activate multiple junctions simultaneously. Instead of sequentially activating each bias light source for different junctions, the invention merges them into a unified configuration where all bias lights are activated at once during a single monochromator scan, thereby maintaining measurement accuracy while dramatically reducing measurement time.
Solution Approach 2:
The patent implements continuous measurement by eliminating the sequential gaps between individual junction measurements. By activating all bias light sources simultaneously and performing a single continuous monochromator scan, the system maintains continuous useful action throughout the measurement process, avoiding the time losses associated with sequential activation and deactivation of individual bias lights.
2Productivity
If LED-based techniques are used for quantum efficiency measurement, then measurement speed increases, but wavelength resolution and accuracy decrease
Solution Approach 1:
The patent creates a multi-functional measurement system that can simultaneously measure multiple junctions across the entire spectrum in a single scan. The unified bias light activation approach enables the system to perform what previously required multiple specialized measurements, achieving both the speed of LED-based techniques and the wavelength resolution of grating monochromators by making the system universal in its measurement capability.
Solution Approach 2:
The patent replaces the mechanical sequential activation mechanism with a simultaneous electronic control system. Instead of mechanically switching between individual bias light sources in sequence, the invention uses electronic control to activate all bias light sources at once, substituting the mechanical sequential operation with an electronic simultaneous operation that maintains both speed and precision.
3Reliability
If multiple sequential scans are performed for each junction, then complete quantum efficiency spectra are obtained, but the mechanical motion increases measurement time
Solution Approach 1:
The patent segments the measurement task by simultaneously measuring all junctions in parallel during a single scan, rather than sequentially measuring each junction separately. This segmentation approach divides the overall measurement into concurrent sub-measurements for each junction, all captured simultaneously, thereby maintaining complete spectral data for each junction while eliminating the time-consuming sequential scan process.
Solution Approach 2:
The patent implements a single periodic monochromator scan that captures all junction characteristics simultaneously, replacing the multiple periodic scans previously required. By synchronizing the monochromator scan with simultaneous activation of all bias light sources, the system obtains complete quantum efficiency spectra for all junctions in one periodic action, dramatically improving measurement throughput.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces measurement time by a factor of three for multijunction photovoltaic devices while retaining the high accuracy of grating monochromator-based techniques, outperforming both existing methods in speed and accuracy.
Implementation Method 1
activating a grating monochromator to emit a first test probe of monochromatic light at a first wavelength
Implementation Method 2
a quantum efficiency test controller performs one or more test iterations to obtain test results related to a quantum efficiency of a multijunction photovoltaic device
Data Source
AI summary
A quantum efficiency test controller (QETC) and related techniques for measuring quantum efficiency are described. The QETC performs one or more test iterations to obtain test results regarding quantum efficiency of a multijunction photovoltaic device (MPD) having a number N of photovoltaic junctions (N>0), where the QETC is associated with N bias light sources. During a test iteration, the QETC activates a grating monochromator to emit a first test probe of monochromatic light at a first wavelength; and while the grating monochromator is emitting the first test probe, iterates through and activates each of the N bias light sources to emit a corresponding bias band of wavelengths of light. After performing the test iteration(s), the QETC generates an output that is based on the test results related to the quantum efficiency of the MPD.


