Temperature and composition dependence of the energy band gap of Pb1?x Mn x S solid solution

Karczewski, G.; Klimkiewicz, M.; Glass, I. I.; Szczerbakow, A.; Behrendt, R.

doi:10.1007/bf00618116

Cited by 13 publications

(2 citation statements)

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“…A linear fit gives d E g /d T to be 0.25 meV/K for the tetragonal phase and 0.28 meV/K for the orthorhombic phase. These values are similar to previously reported values of d E g /d T for a lead composite . The energy associated with the band edge transition of the orthorhombic phase is larger than that of the tetragonal phase.…”

Section: Resultssupporting

confidence: 91%

“…These values are similar to previously reported values of dE g /dT for a lead composite. 25 The energy associated with the band edge transition of the orthorhombic phase is larger than that of the tetragonal phase. Our observation is consistent with previous reports showing the calculated and experimental band gap of the orthorhombic phase larger than that of the tetragonal phase.…”

Section: Resultsmentioning

confidence: 99%

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Exciton and Free Charge Dynamics of Methylammonium Lead Iodide Perovskites Are Different in the Tetragonal and Orthorhombic Phases

2015

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The small exciton binding energy of perovskite suggests that the long lived photoluminescence and slow recovery of the ground state bleaching of the tetragonal phase at room temperature results primarily from the decay of free charges rather than the decay of the initially created excitons. Here we demonstrate the ground state bleaching recovery of the orthorhombic phase of methylammonium lead iodide (CH 3 NH 3 PbI 3 ) is much faster than that of the tetragonal phase using temperature dependent transient absorption spectroscopy. The distribution in orientation of the methylammonium group which is disordered in the tetragonal phase and ordered in the orthorhombic phase results in smaller dielectric constant and larger exciton binding energy in the latter phase. We observe the recovery of the ground state bleaching in the orthorhombic phase to be comprised of decays of both excitons and free charges. Our findings suggest CH 3 NH 3 PbI 3 behaves like a non-excitonic semiconductor in the tetragonal phase and an excitonic semiconductor in the orthorhombic phase.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%