التفاصيل البيبلوغرافية
| العنوان: |
Metasurface-enhanced photochemical activity in visible light absorbing semiconductors. |
| المؤلفون: |
Paudel, Yamuna, Chachayma-Farfan, Diego J., Alù, Andrea, Sfeir, Matthew Y. |
| المصدر: |
Journal of Chemical Physics; 4/14/2024, Vol. 160 Issue 14, p1-9, 9p |
| مصطلحات موضوعية: |
SEMICONDUCTORS, CLEAN energy, SEMICONDUCTOR junctions, SURFACE stability, SOLID-liquid interfaces |
| مستخلص: |
Heterogeneous photocatalysis is an important research problem relevant to a variety of sustainable energy technologies. However, obtaining high photocatalytic efficiency from visible light absorbing semiconductors is challenging due to a combination of weak absorption, transport losses, and low activity. Aspects of this problem have been addressed by multilayer approaches, which provide a general scheme for engineering surface reactivity and stability independent of electronic considerations. However, an analogous broad framework for optimizing light–matter interactions has not yet been demonstrated. Here, we establish a photonic approach using semiconductor metasurfaces that is highly effective in enhancing the photocatalytic activity of GaAs, a high-performance semiconductor with a near-infrared bandgap. Our engineered pillar arrays with heights of ∼150 nm exhibit Mie resonances near 700 nm that result in near-unity absorption and exhibit a field profile that maximizes charge carrier generation near the solid–liquid interface, enabling short transport distances. Our hybrid metasurface photoanodes facilitate oxygen evolution and exhibit enhanced incident photon-to-current efficiencies that are ∼22× larger than a corresponding thin film for resonant excitation and 3× larger for white light illumination. Key to these improvements is the preferential generation of photogenerated carriers near the semiconductor interface that results from the field enhancement profile of magnetic dipolar-type modes. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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