Polar optic phonon and Γ→Lintervalley scattering times in GaAs from steady‐state hot‐electron luminescence spectroscopy

1990 ◽  
Vol 57 (2) ◽  
pp. 174-176 ◽  
Author(s):  
W. Hackenberg ◽  
G. Fasol
Keyword(s):  
Steady State ◽  
Luminescence Spectroscopy ◽  
Hot Electron ◽  
Optic Phonon

Biomimetische Photosysteme zur sakrifiziellen Wasserreduktion / Novel Biomimetic Systems for Visible Light Induced Water Reduction

1993 ◽  
Vol 48 (3) ◽  
pp. 369-386 ◽  
Author(s):  
Stefan Boßmann ◽  
Heinz Dürr ◽  
Eduard Mayer
Keyword(s):  
Steady State ◽  
Visible Light ◽  
Physical Model ◽  
Photochemical Reaction ◽  
Model Systems ◽  
Luminescence Spectroscopy ◽  
Quantum Yields ◽  
Biomimetic Systems ◽  
State Luminescence

Novel microheterogeneous systems for the direct photoreduction of water using visible light in analogy to the photochemical reaction center of Rhodopseudomonas viridis are described in detail. These physical model systems for photosynthesis feature the recently synthesized bisheteroleptic metal complexes [Ru(bpy)2(PP)]Cl2, [Ru(bpy)2(PPB)]Cl2, [Ru(bpy)2(PPB-pCl)]Cl2 and [Ru(bpy)3]Cl2, adsorbed on a negatively charged SiO2—TiO2-colloid, the zwitterionic electron relay PVS and a long-term stable and highly efficient TiO2—Pt-“antenna” catalyst as well as TEOA as sacrificial electron donor.Evidence for the directed absorption of the sensitizers on the SiO2—TiO2-colloid is taken from UV-VIS-measurements, steady-state luminescence-spectroscopy and the quantum yields for PVS-reduction.The hydrogen production in the presence of the SiO2—TiO2-colloid is clearly enhanced and proofs the validity of the underlying concept of physical model systems for photosynthesis.

Hot Electron Relaxation in Quantum Wells

1986 ◽  
Vol 77 ◽  
Author(s):  
S. A. Lyon
Keyword(s):  
Crystal Growth ◽  
Steady State ◽  
Quantum Wells ◽  
Hot Electrons ◽  
Two Dimensional ◽  
Hot Electron ◽  
Carrier Distribution ◽  
Bulk Gaas ◽  
Bulk Semiconductors ◽  
Electron Relaxation

ABSTRACTHot electron relaxation in bulk semiconductors has been studied for several decades, but only through recent advances in crystal growth has it become possible to investigate the ther-malization of hot quasi-two-dimensional carriers in quantum wells. These same advances have opened the possibility of constructing various semiconductor devices which rely on hot electrons for their operation. We discuss experimental results on the energy relaxation of hot electrons in GaAs/AlGaAs quantum wells. The experiments make use of optical spectroscopy for determining the carrier distribution. In particular, steady-state hot photoluminescence measurements have been employed with modulation-doped quantum wells in order to minimally perturb the system by the photoexcited carriers. Both the relaxation of very energetic electrons and the cooling of a hot thermalized carrier distribution are considered. The quantum well results are compared to results from similar experiments with bulk GaAs.

Photothermalization and Hot Electron Dynamics in the Steady State

2019 ◽  
Vol 124 (9) ◽  
pp. 4931-4945 ◽  
Author(s):  
Nicki Hogan ◽  
Shengxiang Wu ◽  
Matthew Sheldon
Keyword(s):  
Steady State ◽  
Hot Electron ◽  
Electron Dynamics
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