Abstract
A large class of new layered semiconductors - lead iodide compounds - is of great interest because of possible optoelectronic applications due to pronounced excitonic effects. These compounds may be regarded as naturally grown semiconductor/insulator superlattices, with perovskite lead iodide (semiconductor) layers sandwiched by alkylammonium (insulator) layers. Exciton binding energies and oscillator strength in these structures are enhanced due to the so-called `dielectric confinement' caused by large difference between dielectric constants of adjoining layers. The binding energies, wave functions, & diamagnetic coefficient of excitons in these naturally grown superlattices are calculated with allowance for the image potential and the superlattice structure of the compounds. The localization of excitons in lead iodide layers causes also a strong dependence of a polariton spike in reflection spectra on the polarization of electromagnetic wave. The results obtained are in agreement with the experimental data.
| Original language | English |
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| Title of host publication | Electrical, Optical, and Magnetic Properties of Organic Solid State Materials |
| Editors | Anthony F. Garito, Alex K-Y. Jen, Charles Y-C. Lee, Larry R. Dalton |
| Publisher | Publ by Materials Research Society |
| Pages | 775-780 |
| Number of pages | 6 |
| Volume | 328 |
| ISBN (Print) | 1558992278 |
| Publication status | Published - 1994 Jan 1 |
| Externally published | Yes |
| Event | Proceedings of the MRS 1993 Fall Meeting - Boston, MA, USA Duration: 1993 Nov 29 → 1993 Dec 3 |
Other
| Other | Proceedings of the MRS 1993 Fall Meeting |
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| City | Boston, MA, USA |
| Period | 93/11/29 → 93/12/3 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials