In the quest for more efficient solar energy systems, a team of researchers from the University of Rome Tor Vergata, MIT, and the University of Milan-Bicocca have been exploring a promising avenue: hybrid thermoelectric-photovoltaic (HTEPV) systems. These systems aim to address a well-known issue in photovoltaics (PV) – the decrease in solar cell efficiency as temperature rises. The team, led by Bruno Lorenzi and including Paolo Mariani, Andrea Reale, Aldo Di Carlo, Gang Chen, and Dario Narducci, has been working on the practical development of these hybrid systems.
The researchers focused on wide-gap solar cells, as these are more suitable for hybridization in terms of efficiency gains. They modeled and developed customized bismuth telluride thermoelectric generators optimized to be hybridized with three types of wide-gap solar cells: amorphous silicon (aSi), Gallium Indium Phosphide (GaInP), and Perovskites. Their model predicted efficiency gains across all three types, with the most significant improvement observed in Perovskites solar cells – an increase from 16.4% to 19.5%, a gain of 3.1%.
To validate these findings, the researchers conducted experiments using Perovskites solar cells. They found that the maximum efficiency gains occurred at typical operating temperatures of conventional PVs, demonstrating the real-world potential of thermoelectric hybridization of solar cells. This research, published in the journal Nature Communications, offers a practical approach to enhancing the efficiency of solar energy systems, which could have significant implications for the energy industry.
The practical applications of this research are substantial. By recovering heat losses from solar cells, HTEPV systems can produce additional power output, thereby increasing the overall efficiency of solar panels. This could lead to more cost-effective and efficient solar energy systems, making solar power a more attractive option for energy providers and consumers alike. Moreover, as the researchers have demonstrated, these systems can be integrated into existing solar cell technologies, making them a viable option for retrofitting current solar panels.
This article is based on research available at arXiv.