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Electronic absorption spectra of lead iodide
Author(s) -
Gobinathan R.,
Hariharan K.,
Ramasamy P.
Publication year - 1981
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19810161222
Subject(s) - iodide , absorption (acoustics) , band gap , exciton , materials science , absorption spectroscopy , liquid nitrogen , spectral line , analytical chemistry (journal) , colloid , crystal (programming language) , range (aeronautics) , thin film , photon energy , chemistry , photon , optics , condensed matter physics , inorganic chemistry , optoelectronics , nanotechnology , physics , organic chemistry , chromatography , astronomy , computer science , composite material , programming language
Optical absorption studies on gel grown single crystals and vacuum evaporated thin film of lead iodide have been carried out at room temperature and liquid nitrogen temperature. The exciton peak in the case of gel grown crystal was observed at 4940 Å whereas for the film at 4900 Å. The presence of lead colloids in the film was revealed through a broad featureless band around 5500 Å. The absorption tails in the temperature range from 80 to 300 K are found to obey Urbach rule. Examining the various power law dependences of the observed optical density on photon energy, it has been established that the transition is of direct type resulting in a band gap of 2.53 ev.