Publication

TEMPERATURE-DEPENDENCE OF THE INP BAND-GAP FROM A PHOTOLUMINESCENCE STUDY

Jean-François Carlin
1991
Journal Articles

Abstract

A set of parameters for the temperature dependence of the direct band gap of InP has been determined by fitting the excitonic recombination energy in the photoluminescence (PL) spectra between 2 and 250 K. We have used high-quality InP samples grown by chemical beam epitaxy. The superfluid-helium temperature PL spectra are characterized by strong excitonic transitions (the excited state n = 2 of the exciton is observed too) from which we have determined the binding energy of the exciton (E(b) = 5.3 meV) and the band-gap energy (E(g) = 1.4239 eV at 1.3 K). The variable-temperature PL spectra are characterized by excitonic transitions for temperatures as high as 250 K. The expression E(g)(T) = 1.4539 - 0.0359(1 + 2/ {exp[209/T (K)] - 1}) eV, which extrapolates to E(g) = 1.347 eV at 300 K, is proposed for the temperature dependence of the InP band gap over the temperature range 0-300 K.

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https://infoscience.epfl.ch/entities/publication/8132cde3-1c2c-4b87-ae3b-e510ee87445b

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Jean-François Carlin
1991
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/8132cde3-1c2c-4b87-ae3b-e510ee87445b

About this result

Related concepts (32)

Band gap

In solid-state physics and solid-state chemistry, a band gap, also called a bandgap or energy gap, is an energy range in a solid where no electronic states exist. In graphs of the electronic band structure of solids, the band gap refers to the energy difference (often expressed in electronvolts) between the top of the valence band and the bottom of the conduction band in insulators and semiconductors. It is the energy required to promote an electron from the valence band to the conduction band.

Exciton

An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force. It is an electrically neutral quasiparticle that exists in insulators, semiconductors and some liquids. The exciton is regarded as an elementary excitation of condensed matter that can transport energy without transporting net electric charge. An exciton can form when a material absorbs a photon of higher energy than its bandgap. This excites an electron from the valence band into the conduction band.

Electronic band structure

In solid-state physics, the electronic band structure (or simply band structure) of a solid describes the range of energy levels that electrons may have within it, as well as the ranges of energy that they may not have (called band gaps or forbidden bands). Band theory derives these bands and band gaps by examining the allowed quantum mechanical wave functions for an electron in a large, periodic lattice of atoms or molecules.

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