The quantum efficiency (QE) is an important measurand which contains extensive information about the electrical and optical properties of photovoltaic devices. During device characterization the measurement is, therefore, mandatory and necessary for e.g. spectral mismatch correction of subsequent examinations. In the present paper, a new real time characterization method is presented which allows accelerating quantum efficiency measurements by a factor of more than 500 times without significantly degrading measurement accuracy, optical bandwidth and resolution. The increased measurement speed is achieved by a frequency division multiplexing approach using a spatial light modulating element which allows it to illuminate the cell under test simultaneously with all wavelengths of interest. Feasibility and reproducibility are demonstrated in experimental measurements and validated by comparison with Fraunhofer ISE CalLab instruments
The quantum efficiency (QE) is an important measure for the electro-optical characterization as well as the calibration of photovoltaic (PV) devices. In this paper we present a novel experimental approach for the generation of monochromatic radiation with sun-like angular characteristics that enables external QE (EQE) measurements of concentrator photovoltaic (CPV) modules. We demonstrate feasibility and reproducibility of our experimental approach by EQE measurements of CPV mono modules consisting of lattice matched component cells and a Fresnel lens. These results are validated by comparison of the integrated short circuit current density to reference indoor and outdoor measurements
Light spectrometers are highly versatile state-of-the-art measurement devices. However, using these systems, e.g., in semiconductor device characterization, creates challenging obstacles with respect to measurement time. We present a new, flexible and accurate approach to either characterize optical properties of arbitrary photosensitive devices or examine the spectral components of light reliably. Using a spatial light modulator (SLM) in combination with frequency division multiplexing methods, it is possible to significantly improve signal-to-noise ratios and decrease measurement times. Moreover, the use of SLM ensures a greater reliability of the setup because conventional moving parts are replaced. The feasibility and experimental setup are described in detail. The setup has been validated for various applications by comparative measurements.
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