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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 6: French-German Session: Membranes and Porous Materials II
CPP 6.5: Vortrag
Montag, 9. März 2026, 12:30–12:45, ZEU/LICH
Electrochemical control of photoluminescence emission by a porous silicon membrane — •Manuel Brinker1 and Patrick Huber1,2 — 1Institute for Materials and X-ray Physics, Hamburg University of Technology, Denickestr. 15, Hamburg 21073, Germany — 2Centre for X-ray and Nano Science CXNS, Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, Hamburg 22607, Germany
Porous silicon is a highly versatile porous material with a broad range of exceptional properties. Due to the geometrical confinement of the pore walls, the band structure is strongly altered and the pore walls effectively act as quantum wires. Thus, photons are emitted in the visible range when the membrane is excited by a UV source. This optical effect has been widely researched and is the foundation for porous silicon to be applied, e.g., as a sensor material in the life sciences. Here, we study the influence of electrochemo-mechanical coupling on the photoluminescence performance. Thereby, charge carriers are accumulated in the electric double layer of a porous silicon electrode by charging it in an electrolyte solution. A change in surface stress at the interface with the porous material is induced and results in an overall mechanical reaction of the porous material. The strain acting on the pore walls consecutively influences the emission characteristics of the photoluminescence emission. An extensive in-situ study ascertains a highly linear dependence of the emission peak's wavelength on the charging state of the electrode. This research establishes the groundwork for porous silicon electrodes to be utilized as mechano-optical sensors.
Keywords: porous silicon; electrochemo-mechanical coupling; photoluminescence