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Sunday, August 14, 2022

Seeing Photovoltaic Devices in a New Light

Scientists from the Institute for Open and Transdisciplinary Research Initiatives at Osaka University discovered a new feature of solar cells made from antimony sulfiodide:sulfide composite they termed the wavelength-dependent photovoltaic effect (WDPE). The team determined that changing the color of incident light from visible to ultraviolet induced a reversible change in the output voltage, while leaving the current generated unchanged. This work may lead to new functional light-sensing and imaging devices.


Photovoltaic (PV) devices — such as solar cells and photodiodes — which convert light energy into electronic power are important as renewable energy sources or as light/image sensors. Recent progress in thin film PV devices has attracted much attention owing to their low-cost process, flexibility, and light weight. However, although various PV devices have been reported so far, reversible and fast wavelength-dependent responses have not been previously observed. To distinguish between irradiation colors using a single photodiode, a liquid crystal filter must be used that can electronically switch the absorption color range. However, these filters are bulky; being able to perform color detection without requiring such filters would be useful for minimizing the size of photovoltaic devices. For further information see the IDTechEx report on Materials for Printed/Flexible Electronics 2021-2031: Technologies, Applications, Market Forecasts.


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