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

被引：171
作者：
Tanaka, Kenichiro [1 ]
Kondo, Takashi [1 ]
机构：
[1] Univ Tokyo, Dept Mat Sci, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
来源：
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS | 2003年 / 4卷 / 06期
关键词：
Optical properties; Electroabsorption; Excitons;
D O I：
10.1016/j.stam.2003.09.019
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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)(m-1)PbmI3m+1. 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)(m-1)PbmI3m+1 (m >= 2) can be reproduced by the effective-mass approximations, while the effective-mass approach is not valid for (C6H13NH3)(2)PbI4 (m = 1). (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：599 / 604
页数：6
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