On the pathway of photoexcited electrons: probing photon-to-electron and photon-to-phonon conversions in silicon by ATR-IR

Yüce, Emre
Hansen, Ole
Mul, Guido
Gardeniers, Han (J. G. E.)
Photoexcitation and charge carrier thermalization inside semiconductor photocatalysts are two important steps in solar fuel production. Here, photoexcitation and charge carrier thermalization in a silicon wafer are for the first time probed by a novel, yet simple and user-friendly Attenuated Total Reflectance Infrared spectroscopy (ATR-IR) system.


The Effect of Synthesis Parameters for the Mesoporous Carbons Using Silica Aerogel Templates
Sarıyer, Merve; Sezgi, Naime Aslı (null; 2019-04-22)
Hydrogen is considered as one of the most promising future energy carrier due to its high energy density and its production through ethanol steam reforming reaction (SRE) has the potential to be used for its on board production, in fuel cell powered motor vehicles. Nowadays, novel catalysts are investigated for the steam reforming of ethanol reactions in order to achieve high hydrogen yield with low coke formation. One of the novel catalyst is a mesoporous material templated mesoporous carbon. Mesoporous ca...
On the applicability of progress variable approach for large eddy simulation of premixed flames
Tekgül, Bulut; Aksel, Mehmet Haluk; Baran, Özgür Uğraş; Department of Mechanical Engineering (2017)
Combustion applications are the primary energy source and will continue to be for the near future. Therefore, accurate modeling of combustion applications is crucial to study and improve the processes. In this study, progress variable approach is used with the implementation of a source term found in literature to simulate selected fully premixed combustion applications. CFD computations and preprocessing steps were conducted using OpenFOAM C++ library. Thermophysical values were obtained from zero and one ...
Ekiz, Ahmet; Camci, Talha; Turkmen, Ibrahim; SANKIR, MEHMET; USLU, SITKI; Baker, Derek Keıth; Agar, Ertan (2011-09-01)
Fuel cell technology is one of the most economic and efficient ways to utilize hydrogen energy. Various types of fuel cells are present regarding the fuel type and amount of power produced. Among these, proton exchange membrane fuel cells (PEMFCs) are very promising. In this work, a 2D proton exchange membrane fuel cell unit cell was modeled using Comsol Multiphysics software. Cell section was taken parallel to flow direction. Obstacles with various geometries were placed in the flow channel in order to for...
Preparation and characterization of metal oxide supported group 9B metal nanoparticles and their use as electrocatalysts in water splitting
Akbayrak, Merve; Önal, Ahmet Muhtar; Department of Chemistry (2022-9-2)
Hydrogen has been regarded as a crucial energy carrier due to its high energy density. Therefore, there is an increasing attention for the production of hydrogen. Among the hydrogen production methods, water splitting is one of the well-known environmentally friendly methods for the production of hydrogen. Although a large variety of catalysts have been tested in water splitting, the development of efficient and long-lived electrocatalysts is still an important issue. This thesis covers the preparation, cha...
Production of amorphous silicon / p-type crystalline silicon heterojunction solar cells by sputtering and PECVD methods
Eygi, Zeynep Deniz; Turan, Raşit; Erçelebi, Ayşe Çiğdem; Department of Physics (2011)
Silicon heterojunction solar cells, a-Si:H/c-Si, are promising technology for future photovoltaic systems. An a-Si:H/c-Si heterojunction solar cell combines the advantages of single crystalline silicon photovoltaic with thin-film technologies. This thesis reports a detailed survey of heterojunction silicon solar cells with p-type wafer fabricated by magnetron sputtering and Plasma Enhanced Chemical Vapor Deposition (PECVD) techniques at low processing temperature. In the first part of this study, magnetron ...
Citation Formats
E. KARABUDAK, E. Yüce, S. SCHLAUTMANN, O. Hansen, G. Mul, and H. (. G. E. ). Gardeniers, “On the pathway of photoexcited electrons: probing photon-to-electron and photon-to-phonon conversions in silicon by ATR-IR,” PHYSICAL CHEMISTRY CHEMICAL PHYSICS, pp. 10882–10885, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35917.