Journal
PHYSICAL REVIEW B
Volume 76, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.76.075203
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We present an experimental and theoretical study of the role of band filling effects in the hydrostatic pressure dependence of photoluminescence (PL) from InN. The PL peak pressure coefficient dE(PL)/dp is shown to decrease from 27.3 +/- 1.1 meV/GPa to 20.8 +/- 0.8 meV/GPa when the electron concentration increases from 3.6x10(17) cm(-3) to 1.1x10(19) cm(-3). We argue that this decrease is caused by the pressure sensitivity of the Fermi level in InN, which induces a lowering of dE(PL)/dp with respect to the band gap pressure coefficient dE(G)/dp. dE(PL)/dp is shown to depend on the electron concentration in accordance with predictions based on ab initio calculations, taking into account the influence of conduction-band nonparabolicity.
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