Dr. Baptiste Bérenguier Profile

Dr. Baptiste Bérenguier

at IRDEP

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Proceedings Article | 30 May 2022 Presentation

Mapping absorption coefficient of photovoltaic absorbers through photoluminescence imaging

Marie Legrand, Baptiste Bérenguier, Guillaume Vidon, Daniel Ory, Jean-François Guillemoles

Proceedings Volume PC12150, PC121500B (2022) https://doi.org/10.1117/12.2624478

KEYWORDS: Absorption, Luminescence, Photovoltaics, Spectroscopy, Photons, Solar energy, Silicon, Semiconductors, Quantum efficiency, Photon transport

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Absorption coefficient rules photonic transport within solar cells and is key for optical optimization. By probing materials density of states, it offers insights in defects characterization of photovoltaic device. Moreover, obtaining this quantity locally would refine the interpretation of the photoluminescence (PL) maps. Its measurement raise challenges as far as classical spectroscopy signals depends on the whole stack structure. Also, its exponential decrease hinders its accurate determination near bandgap energy. When describing photoluminescence, light absorption influences both the generation function - at the excitation wavelength - and the photons emission and propagation - close to the bandgap energy. We take advantage of these dependances to explore different techniques to obtain either the absorptivity or the absorption coefficient and discuss the link between these two quantities. Transient photoluminescence excitation (PLE) measurement is used to determine the local absorptivity above the bandgap with multidimensional PL imaging techniques. We assess the impact of pulsed excitation on the measurement by modelling the both transient and continuous regime. In addition, absorptivity can be obtained near the optical bandgap directly from the PL spectrum. In this frame, low temperature measurements have already allowed the determination of absorption coefficient with ultra-low values. These different approaches are compared to reflection measurements classically used at the global scale. The limitations and application scope of the different absorption determination will be described, as well as how they relate to one another. Finally, application to PL imaging will be discussed.

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