The Fermi energy and in-plane electron effective mass in semiconductive thin films with non-parabolic energy band

2008 ◽  
Vol 403 (10-11) ◽  
pp. 1751-1754 ◽  
Author(s):  
Bahşeli İ. Guliyev ◽  
Ramazan F. Eminbeyli
Keyword(s):  
Thin Films ◽  
Effective Mass ◽  
Fermi Energy ◽  
Energy Band ◽  
Electron Effective Mass ◽  
Parabolic Energy Band

Structural, Optical, and Electron Transport Qualities of Zinc-Stannate Thin Films

2001 ◽  
Vol 666 ◽  
Author(s):  
David L. Young ◽  
Timothy J. Coutts ◽  
Don L. Williamson
Keyword(s):  
Thin Films ◽  
Effective Mass ◽  
Conduction Band ◽  
Fermi Energy ◽  
Impurity Scattering ◽  
Rf Magnetron Sputtering ◽  
Scattering Parameter ◽  
Band Theory ◽  
Zinc Stannate ◽  
Dependent Transport

ABSTRACTSingle-phase, spinel zinc stannate (ZTO = Zn2SnO4) thin films were grown by rf magnetron sputtering onto glass substrates. Uniaxially oriented films with resistivities of 10−2 -10−3 ωcm, mobilities of 16 - 26 cm2/V-s, and n-type carrier concentrations in the low 1019 cm−3 range were achieved. X-ray diffraction peak intensity studies established the films to be in the inverse spinel configuration. 119Sn Mössbauer studies identified two octahedral Sn sites, each with a unique quadrupole splitting, but with a common isomer shift consistent with Sn+4. A pronounced Burstein-Moss shift moved the optical bandgap from 3.35 eV to as high as 3.89 eV.Density-of-states effective mass, relaxation time, mobility, Fermi energy level, and a scattering parameter were calculated from transport data. Effective-mass values increased with carrier concentration from 0.16 to 0.26 me as the Fermi energy increased from 0.2 to 0.9 eV above the conduction-band minimum. First-order nonparabolic conduction-band theory was applied to extrapolate a bottom-of-the-band effective mass of 0.15 me. Calculated scattering parameters and temperature-dependent transport measurements correlated well with ionized impurity scattering with screening by free electrons for highly degenerate films.

INVESTIGATION OF TRANSPORT AND OPTICAL PROPERTIES OF MESOPOROUS ANATASE AND RUTILE TiO2 FILMS FOR APPLICATION IN DYE-SENSITIZED SOLAR CELLS

2012 ◽  
Vol 26 (19) ◽  
pp. 1250123 ◽  
Author(s):  
DIVYA JYOTI ◽  
DEVENDRA MOHAN ◽  
RAKESH DHAR
Keyword(s):  
Thin Films ◽  
Effective Mass ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
High Mobility ◽  
Lattice Relaxation ◽  
Spectroscopic Studies ◽  
Electron Effective Mass ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

The transport of electrons through TiO 2 anatase and rutile thin films synthesized via sol–gel route has been investigated using electronic and optical spectroscopic studies. Mesoporosity of the films is confirmed by poroellipsometry. A smaller electron effective mass in anatase can be accounted for larger effective Bohr radius of trap electrons observed in anatase than in rutile. Further, the smaller effective mass in anatase favors high mobility. A mott transition is observed in anatase with change in temperature but not in rutile. Luminescence of self-trapped excitons is observed in anatase thin films, that implies a strong lattice relaxation.

Nitrogen composition dependence of electron effective mass inGaAs1−xNx

2010 ◽  
Vol 82 (12) ◽  
Author(s):  
T. Dannecker ◽  
Y. Jin ◽  
H. Cheng ◽  
C. F. Gorman ◽  
J. Buckeridge ◽  
...  
Keyword(s):  
Effective Mass ◽  
Composition Dependence ◽  
Electron Effective Mass
Sign in / Sign up

Export Citation Format

Share Document