Fast external quantum efficiency measurements of photovoltaic modules

Paul F. Ndione; Nikos Kopidakis; Daniel J. Friedman

doi:10.1117/12.2617166

1 April 2022 Fast external quantum efficiency measurements of photovoltaic modules

Paul F. Ndione, Nikos Kopidakis, Daniel J. Friedman

Proceedings Volume PC11996, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XI; PC1199605 (2022) https://doi.org/10.1117/12.2617166
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

The external quantum efficiency (EQE) or associated spectral response is widely used to evaluate the performance of photovoltaics, light emitting diodes, photodetectors, photodiodes, semiconductor lasers, laser-induced refrigeration of solids etc. For photovoltaic (PV) devices, The EQE is used to determine the spectral mismatch correction that is used to convert a performance measurement from a non-ideal simulator spectrum to a standard spectrum in PV device calibrations. Moreover, EQE can provide important insight into the physics of a PV device. For instance, the EQE shape can be used to infer mechanisms limiting the performance of the device. However, EQE measurements of full-size PV modules remain a challenge in the PV community due to rare availability of reliable module QE measurement tools worldwide and the size and complexity of module architecture that comprises several cells connected in strings (series or/and parallel). Here, we use a customized nondestructive tool made of high-power light emitting diodes to perform high-throughput EQE measurements on PV modules. Circuit simulations show that the measurement system can safely be used to measure both crystalline silicon and thin film-based PV modules with series connected cells without the risk of damage through reverse bias. In addition, EQE mapping combined with electroluminescence show a strong correlation and provide a way to determine both spatial non-uniformity of the spectral response and defects/degradation effects across the module.

Conference Presentation

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Paul F. Ndione, Nikos Kopidakis, and Daniel J. Friedman "Fast external quantum efficiency measurements of photovoltaic modules", Proc. SPIE PC11996, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XI, PC1199605 (1 April 2022); https://doi.org/10.1117/12.2617166

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KEYWORDS

External quantum efficiency

Solar cells

Photovoltaics

Light emitting diodes

Semiconductor lasers

Silicon films

Quantum efficiency

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