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O: Fachverband Oberflächenphysik

O 84: Focus Session: Semiconductor Materials and Nanostructure for Photocatalysis

O 84.6: Vortrag

Donnerstag, 23. März 2017, 11:45–12:00, POT 51

Omnidirectional Photoelectrochemical Activity of Ultrathin CdS film on Periodic Three-Dimensional Composite Pillar/Truncated-Pyramid Au arrays — •Rui Xu, Liaoyong Wen, Huaping Zhao, Shipu Xu, Max Sommerfeld, Yang Xu, Yan Mi, Yaoguo Fang, and Yong Lei — Institute of Physics & Institute of Micro- and Nanotechnologies (ZIK MacroNano), Ilmenau University of Technology, 98693 Ilmenau, Germany

Photonic mode and surface plasmon resonance show prominent promise in improving light utilization of solar energy-related devices. In order to incorporate both features simultaneously, we designed and manufactured ordered array of three-dimensional metal pillar/truncated-pyramid (PTP) nanostructures. The experiments along with simulation indicate that the Au PTP arrays demonstrate multiple SPR and PM originated from the two structural elements leading to superior and broadband anti-reflection performance. To take these advantages, a conformal 90-nm-thick CdS film was coated on the PTP nanostructures and the resultant photoanode reaches a respectable light absorption over 90% in the overall optical operation regime. More importantly, the efficient light-trapping is omnidirectional and the calculated average absorptivity keeps almost the same in at least 50 degree range. The PTP photoanode demonstrated a dispersive light absorption, which worked in concert with CdS surface extension and strong light absorption to achieve a tremendous current promotion by a factor of 2.8 from the flat counterpart at -0.2 V (vs. Ag/AgCl).