An OFDM-Based Photovoltaic Device Characterization Bench Pairing Electrical Impedance Spectroscopy (EIS) and Intensity Modulated Photocurrent Spectroscopy (IMPS)

The frequency response of a photovoltaic photodetector to LED light intensity modulations is used to measure its performance as a data receiver for indoor visible light communication. An equivalent small-signal active model consistent with this dynamic response would help in understanding how the core materials and interfaces within the photovoltaic device influence the overall behavior. This paper presents a new approach to modeling the dynamic behavior of a photovoltaic device by jointly utilizing its spectral response to electrical excitation (known as Electrical Impedance Spectroscopy) and photonic excitation (known as Intensity Modulated Photocurrent Spectroscopy). To minimize the time required for measurements and ensure the stability of experimental conditions, we use orthogonal frequency division multiplexing input signals. Preliminary results obtained with a monocrystalline silicon photovoltaic cell and an organic photovoltaic cell demonstrate the relevance of our approach.