Lowering the Temperature and Increasing the Fill Factor of Silicon Solar Cells by Filtering of Sub-Bandgap Wavelengths

Or Gindi, Zeev Fradkin, Anat Itzhak, Peter Beker

Research output: Contribution to journalArticlepeer-review


Silicon-based photovoltaic (PV) cells are currently the most prevalent and cost-effective solution for solar energy generation. Given their dominance in the market and the extensive research dedicated to them, they are ideal targets for efficiency enhancement through innovative yet straightforward methods. This study explores the potential for improving the efficiency of these cells by managing the PV’s temperature using an infrared (IR) filter. The filter allows photons that can generate free electron–hole pairs to pass while reflecting those with wavelengths below the semiconductor bandgap, which otherwise contribute to performance degradation. Various techniques were applied, including I–V analysis, impedance measurements, and atmospheric scanning electron microscope (Air-SEM) observations, to examine the temperature’s impact on silicon PVs. By integrating IR filters, the results showed a 3% increase in the fill factor and a temperature reduction of approximately 10 degrees Celsius. These findings highlight the potential of this cooling approach for silicon cells, which can enhance the cell’s longevity and efficiency, paving the way for future industrial applications.

Original languageEnglish
Article number5631
Issue number15
StatePublished - Aug 2023

Bibliographical note

Publisher Copyright:
© 2023 by the authors.


A.I. thanks the Israel Ministry of Science & Technology Ph.D. fellowship support at BI.

FundersFunder number
Ministry of science and technology, Israel


    • Air-SEM
    • I–V
    • PV
    • climate change
    • filter
    • impedance
    • infrared
    • photovoltaics
    • renewable energy
    • silicon
    • solar cell efficiency


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