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Science and Technology of Advanced Materials Volume 4, 2003 - Issue 6
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Human-Friendly Materials Based on Chemistry

Bandgap and exciton binding energies in lead-iodide-based natural quantum-well crystals

Kenichiro TanakaCorrespondence[email protected]
&
Takashi KondoDepartment of Materials Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Pages 599-604 | Received 12 Sep 2003, Accepted 23 Sep 2003, Published online: 02 Mar 2004
 
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Abstract

We have performed optical absorption and electroabsorption studies on the lead-iodide-based natural quantum-well perovskite-type crystals with different well width (C6H13NH3)2(CH3NH3)m21PbmI3mþ1. With decreasing well thickness, m; the resonance energies of the lowest-energy excitons shift to higher energy due to the increase of the bandgap. The binding energies and oscillator strengths of the excitons drastically increase due to the spatial confinement and image charge effect with decreasing m: The bandgap of (C6H13NH3)2(CH3NH3)m21- PbmI3mþ1 (m ≥ 2) can be reproduced by the effective-mass approximations, while the effective-mass approach is not valid for (C6H13NH3)2PbI4 (m = 1).

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