Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 42: Plasmonics IV (joint session O/CPP)

CPP 42.11: Vortrag

Mittwoch, 3. April 2019, 17:30–17:45, H8

three-dimensional plasmonic nanostructure design for boosting photoelectrochemical — •rui xu, huaping zhao, max sommerfeld, and yong lei — Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693, Ilmenau, Germany

Plasmonic nanostructures have been widely incorporated into different semiconductor materials to improve solar energy conversion. An important point is how to manipulate the incident light so that more light can be efficiently scattered and absorbed by the semiconductors. Here, by using a tunable three-dimensional Au pillar/truncated-pyramid (PTP) array as a plasmonic coupler, a superior optical absorption of about 95% within a wide wavelength range is demonstrated from an assembled CdS/Au PTP photoanode. Based on incident photon to current efficiency measurements and the corresponding simulations, it is concluded that the enhancement is mainly attributed to an appropriate spectral complementation between surface plasmon resonance modes and photonic modes in the Au PTP structure over the operational spectrum. Because both of them are wavelength dependent, the Au PTP profile and CdS thickness are further adjusted to take full advantages of the complementary effect and subsequently, an angle independent photocurrent with an enhancement of about 400% was obtained. The designed plasmonic PTP nanostructure of Au is highly robust and it could be easily extended to other plasmonic metals equipped with semiconductor thin film for photovoltaic and photoelectrochemical cells.