Electroluminescence Excitation Spectroscopy: A Novel Approach to Non-Contact Quantum Efficiency Measurements

The current–voltage measurement is the most important measurement in solar cell quality control. As the contacting process of cells results in mechanical stress and consumes a significant amount of measurement time, this work presents an IV characterization based on contactless measurements only. An empirical model is introduced that can derive the full IV curve and IV parameters as the open‐circuit voltage, short‐circuit current density, fill factor, and efficiency. As a basis, a series of photoluminescence and contactless electroluminescence images and spectral reflectance measurements are used. An advantage of the model's convolutional neural network design lies in the semantic compression of local image structures across the input data. Within an ablation study, it is shown that the empirical model is well suited to combine these data sources, which is the optimal input configuration for contactless IV derivation. The accuracy, e.g., with an error in efficiency of 0.035 % abs and correlation of over 99%, is similar to comparing two contacting IV measurement devices. The contactless IV curves also have a close fit to their contacted counterparts. Within simulations on module level, it is demonstrated that contactless binning performs as well as contacting binning and does not result in any additional mismatch loss.

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“…[ 9 ] The luminescence spectrum can be analyzed to calculate the external quantum efficiency. [ 10–13 ]…”

Section: Introductionmentioning

confidence: 99%

“…[9] The luminescence spectrum can be analyzed to calculate the external quantum efficiency. [10][11][12][13] We adopt the approach by Greulich et al and propose an empirical model for IV determination purely based on contactless measurement techniques targeted on using less and only inline applicable measurement techniques for industrial usage.…”

mentioning

confidence: 99%