USING OPTICALLY DETECTED CYCLOTRON RESONANCE TO STUDY ELECTRON-EXCITON AND ELECTRON-PHONON INTERACTIONS IN SEMICONDUCTORS

We review our optically detected cyclotron resonance (ODCR) studies extending over Ge, Si and ZnSe. The following three subjects are taken up: (1) Impact dissociation of excitons by free carriers, which is dominated by electron-electron and hole-hole interactions rather than by electron-hole interaction. (2) The hot-carrier state produced in Ge and Si by cyclotron resonance is discussed in terms of hot-carrier-distribution function, effective carrier temperature, and carrier kinetics. (3) The relaxation process of photoexcited carriers in ZnSe is discussed. This relaxation process is found to be dominated by electron-polar-optical-phonon interaction, which gives rise to the polaron effect and to resonant formation of free excitons following one-LO-phonon emission. Thermally detected cyclotron resonance (TDCR) is also introduced.

Download Full-text

Optically Detected Cyclotron Resonance of Exciton and Electron-Hole Droplet Systems in Pure Germanium

Journal of the Physical Society of Japan ◽

10.1143/jpsj.58.3718 ◽

1989 ◽

Vol 58 (10) ◽

pp. 3718-3726 ◽

Cited By ~ 8

Author(s):

Tatsuya Tomaru ◽

Tyuzi Ohyama ◽

Eizo Otsuka

Keyword(s):

Cyclotron Resonance ◽

Electron Hole ◽

Optically Detected

Download Full-text

Protecting hot carriers by tuning hybrid perovskite structures with alkali cations

Science Advances ◽

10.1126/sciadv.abb1336 ◽

2020 ◽

Vol 6 (43) ◽

pp. eabb1336 ◽

Cited By ~ 1

Author(s):

Ti Wang ◽

Linrui Jin ◽

Juanita Hidalgo ◽

Weibin Chu ◽

Jordan M. Snaider ◽

...

Keyword(s):

Carrier Transport ◽

Successful Implementation ◽

Hot Carriers ◽

Alkali Cations ◽

Hot Carrier ◽

Hybrid Perovskite ◽

Carrier Temperature ◽

High Carrier ◽

Halide Perovskites ◽

Effective Carrier

Successful implementation of hot carrier solar cells requires preserving high carrier temperature as carriers migrate through the active layer. Here, we demonstrated that addition of alkali cations in hybrid organic-inorganic lead halide perovskites led to substantially elevated carrier temperature, reduced threshold for phonon bottleneck, and enhanced hot carrier transport. The synergetic effects from the Rb, Cs, and K cations result in ~900 K increase in the effective carrier temperature at a carrier density around 1018 cm−3 with an excitation 1.45 eV above the bandgap. In the doped thin films, the protected hot carriers migrate 100 s of nanometers longer than the undoped sample as imaged by ultrafast microscopy. We attributed these improvements to the relaxation of lattice strain and passivation of halide vacancies by alkali cations based on x-ray structural characterizations and first principles calculations.

Download Full-text

Hot Carrier Effects in Optically Detected Cyclotron Resonance Studies of III-V Semiconductors

Acta Physica Polonica A ◽

10.12693/aphyspola.82.623 ◽

1992 ◽

Vol 82 (4) ◽

pp. 623-626

Author(s):

K. Karpińska ◽

S. Dedulewicz ◽

M. Godlewski

Keyword(s):

Cyclotron Resonance ◽

Hot Carrier ◽

Optically Detected ◽

Hot Carrier Effects

Download Full-text

Carrier kinetics and electron–polar-optical-phonon interaction in ZnSe studied by optically detected cyclotron resonance

Physical Review B ◽

10.1103/physrevb.46.9390 ◽

1992 ◽

Vol 46 (15) ◽

pp. 9390-9399 ◽

Cited By ~ 12

Author(s):

Tatsuya Tomaru ◽

Tyuzi Ohyama ◽

Eizo Otsuka ◽

Minoru Isshiki ◽

Kenzo Igaki

Keyword(s):

Optical Phonon ◽

Cyclotron Resonance ◽

Polar Optical Phonon ◽

Phonon Interaction ◽

Optically Detected

Download Full-text

Optically Detected Magnetic Resonance and Double Beam Photoluminescence of CdS/HgS/CdS Nanoparticles

MRS Proceedings ◽

10.1557/proc-536-257 ◽

1998 ◽

Vol 536 ◽

Author(s):

H. Porteanu ◽

A. Glozman ◽

E. Lifshitz ◽

A. Eychmüller ◽

H. Weller

Keyword(s):

Optical Properties ◽

Magnetic Resonance ◽

Cds Nanoparticles ◽

Electron Hole ◽

Cladding Layer ◽

Double Beam ◽

Optically Detected Magnetic Resonance ◽

Optically Detected ◽

Cladding Layers ◽

Hole Recombination

AbstractCdS/HgS/CdS nanoparticles consist of a CdS core, epitaxially covered by one or two monolayers of HgS and additional cladding layers of CdS. The present paper describes our efforts to identify the influence of CdS/HgS/CdS interfaces on the localization of the photogenerated carriers deduced from the magneto-optical properties of the materials. These were investigated by the utilization of optically detected magnetic resonance (ODMR) and double-beam photoluminescence spectroscopy. A photoluminescence (PL) spectrum of the studied material, consists of a dominant exciton located at the HgS layer, and additional non-excitonic band, presumably corresponding to the recombination of trapped carriers at the interface. The latter band can be attenuated using an additional red excitation. The ODMR measurements show the existence of two kinds of electron-hole recombination. These electron-hole pairs maybe trapped either at a twin packing of a CdS/HgS interface, or at an edge dislocation of an epitaxial HgS or a CdS cladding layer.

Download Full-text

Optical analysis of hot carrier distribution and transport properties in InP/AlInAs type II heterostructures

Semiconductor Science and Technology ◽

10.1088/0268-1242/7/3b/066 ◽

1992 ◽

Vol 7 (3B) ◽

pp. B271-B273 ◽

Cited By ~ 9

Author(s):

R Sakamoto ◽

T Kohno ◽

T Kamiyoshi ◽

M Inoue ◽

S Nakajima ◽

...

Keyword(s):

Transport Properties ◽

Type Ii ◽

Optical Analysis ◽

Carrier Distribution ◽

Hot Carrier

Download Full-text

Hot-carrier distribution function in nonparabolic energy bands

Journal of Physics and Chemistry of Solids ◽

10.1016/0022-3697(67)90302-2 ◽

1967 ◽

Vol 28 (3) ◽

pp. 373-382 ◽

Cited By ~ 61

Author(s):

D. Matz

Keyword(s):

Distribution Function ◽

Energy Bands ◽

Carrier Distribution ◽

Hot Carrier

Download Full-text

Phase Transition in Two-Dimensional Electron-Hole Systems in High Magnetic Fields and Their Effect on Cyclotron Resonance Spectra

Magnetic Resonance and Related Phenomena ◽

10.1007/978-3-642-81344-3_199 ◽

1979 ◽

pp. 263-263

Author(s):

I. V. Lerner ◽

Yu. E. Lozovik

Keyword(s):

Phase Transition ◽

Magnetic Fields ◽

Cyclotron Resonance ◽

High Magnetic Fields ◽

Two Dimensional ◽

Dimensional Electron ◽

Electron Hole

Download Full-text

THE HOT CARRIER TEMPERATURE IN THE ANALYSIS OF THE FREE TO ACCEPTOR PHOTOLUMINESCENCE TRANSITION

Modern Physics Letters B ◽

10.1142/s0217984901002324 ◽

2001 ◽

Vol 15 (17n19) ◽

pp. 696-699 ◽

Cited By ~ 1

Author(s):

G. Fonthal ◽

M. de los Rios ◽

J. Quintero ◽

N. Piraquive ◽

H. Ariza-Calderón

Keyword(s):

Fermi Level ◽

Band Gap ◽

Density Of States ◽

Impurity Concentration ◽

Lattice Temperature ◽

Band Tail ◽

Hot Carrier ◽

Additional Information ◽

Carrier Temperature ◽

Shape Equation

We analyzed the free to acceptor (e-A) photoluminescence transition on a GaAs:Ge sample using the hot carrier temperature and the Kane's DOS. This latter temperature was calculated by the spectra largest energy tail. While the lattice temperature was put in the e-A Eagles' shape equation, the fitting was poor but if the modified line was put into the equation, the fitting was better. So, the ionization impurity energy, the band gap, the Fermi level and the band tail can be measured with a better precision than the measurements traditionally made with this method, Additional information about phonons participant can be obtained. In conclusion, the hot carrier temperature and the density of states due to the impurity concentration should be used in the e-A transition photoluminescence analysis.

Download Full-text