Scientists develop silicon cells capable of absorbing infrared radiation from the sun

March 26, 2014
Scientists develop silicon cells capable of absorbing infrared radiation from the sun
The new silicon cell capable of absorbing the infrared radiation.

Researchers of the Universitat Politècnica de València, the Spanish National Research Council (CSIC, in Spanish), the Universitat Politècnica de Catalunya-BarcelonaTech (UPC) and the Universidad Rovira i Virgili de Tarragona have developed a silicon photovoltaic cell capable of turning infrared radiation into electricity.

Nature Communications magazine has published this new development led by Francisco Meseguer professor from the CSIC, at the joint lab UPV/CSIC.

The sun is an inexhaustible source of energy which well-exploited, could solve many of the energy supply problems we have today. The is a device capable of turning solar light into . However, there are many obstacles that prevent widespread use, such as a relatively high cost (0.02 euros per watt generated) and the low efficiency of silicon-based , around 17 per cent.

The low efficiency is related to the material the solar cell is made of. Most solar cells are made of silicon which is relatively cheap to produce. However these solar cells can generate electricity only from the visible part of the sun spectrum, not the infrared region.

Professor Francisco Meseguer says, "After three years of work, our research team has developed a new concept of able to absorb from the sun and convert it into electricity." Moisés Garín, a researcher from the CSIC and the Universitat Politècnica de Catalunya, says, "What we have done is create photovoltaic cells on a micrometre-scale silicon sphere, where infrared light is trapped until it is absorbed, turning it into electricity".

Scientists develop silicon cells capable of absorbing infrared radiation from the sun
The new silicon cell capable of absorbing the infrared radiation.

This work is a new scientific achievement for the development of high-performance photovoltaic cells in the future.

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Explore further: UCLA's new transparent solar film could be game-changer

More information: M. Garín, R. Fenollosa, R. Alcubilla, L. Shi, L.F. Marsal y F. Meseguer. "All-silicon spherical-Mie-resonator photodiode with spectral response in the infrared region." Nature Communications 5, Article number: 3440 DOI: 10.1038/ncomms4440 . Received 10 July 2013 Accepted 12 February 2014 Published 10 March 2014

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