Gap energy studied by optical transmittance in lead iodide monocrystals grown by Bridgman's Method

The bandgap energy as a function of temperature has been determined for lead iodide. The monocrystal was obtained in a vacuum sealed quartz ampoule inside a vertical furnace by Bridgman's method. The optical transmittance measurement enables to evaluate the values of Eg. By a fitting procedure of Eg as a function of temperature is possible to extract the parameters that govern its behavior. The variation of Eg with temperature was determined as: Eg(T) = Eg(0) - <FONT FACE="Symbol">a</FONT>T2/(<FONT FACE="Symbol">a</FONT> + T), with: Eg(0) = (2.435 <FONT FACE="Symbol">±</FONT> 0.008) eV, <FONT FACE="Symbol">a</FONT> = (8.7 <FONT FACE="Symbol">±</FONT> 1.3) x 10-4 eV/K and <FONT FACE="Symbol">a</FONT> = (192 <FONT FACE="Symbol">±</FONT> 90) K. The bandgap energy of lead iodide at room temperature was found to be 2.277 <FONT FACE="Symbol">±</FONT> 0.007 eV.

Bibliographic Details

Main Authors:	Veissid,N., An,C.Y., Silva,A. Ferreira da, Souza,J.I. Pinto de
Format:	Digital revista
Language:	English
Published:	ABM, ABC, ABPol 1999
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14391999000400007
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