FlashQE

One Spectra per Second, Really!

3-D map of a six cell module.

3-D map of a six cell module.

Tau Science’s innovative FlashQE® system modernizes one of the most powerful diagnostic tools available to Photovoltaic manufacturers and researchers, Quantum Efficiency.  Using a combination of novel optics and analysis techniques (patents pending), FlashQE® increases measurement throughput by more than one thousand times compared to existing QE systems.  Broadband Reflectance, External QE, Reflectance and Jsc are measured simultaneously, spanning the range 300-1580nm. FlashQE® can be integrated into either a mapping or single site inline system.  

The Mapping FlashQE® system includes a measurement chamber, a two-axis stage for automated sample navigation and a feature-rich software control package that allows the user to write and execute measurement recipes.  A data review package facilitates quick report generation and intuitive navigation of spatially and spectrally resolved conversion efficiency maps.  An optional optical bias is available in both blue and near-IR to study near-surface and bulk trapping, or multi-junction devices.  

The FlashQE® system can also be integrated in-line for Cell Sorting and Statistical Process Control applications.  The system is configurable with factory interface standards for communication with cell sorters and communication to a factory host.  It is available with an automated XY stage (for uniformity maps) or without, for use as a high-throughput fixed-point sampling device.

3-D map of single cell.

3-D map of single cell.

FlashQE measures external quantum efficiency and reflectance which allows the system to calculate internal quantum efficiency.    Because the measurement time is so low the FlashQE can map EQE, IQE, R, and Jsc of cells and modules.  Combined, this information is put together in a 4-D data set and can be plotted in 3-D movies.  Features include light biasing, electrical biasing, auto calibration, integrating sphere, and a configurable spot size.    

Intensity Plot of single cell.

Intensity Plot of single cell.

FlashQE can measure any module size.  This is useful to identify spectral mismatch between individual cells in a module, or cells which were damaged as they were integrated into a module.  Module maps can also provide data regarding aging or device degradation.  The 3-D module map can play as a movie which moves through the various wavelength responses. 

Single cell maps allow detailed spatial analysis of devices.  This can be used to improve device design and processing parameters, or monitor repeatability.    

Repeatability over 9 hours and 32,000 measurements.

Repeatability over 9 hours and 32,000 measurements.

Data can also be displayed as 2-D intensity maps.  Note the slider bar at the bottom that can be used to select wavelength.