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



Document title: Gap energy studied by optical transmittance in lead iodide monocrystals grown by Bridgman's Method
Journal: Materials research
Database: PERIÓDICA
System number: 000312408
ISSN: 1516-1439
Authors: 1


Institutions: 1Instituto Nacional de Pesquisas Espaciais, Sao Jose dos Campos, Sao Paulo. Brasil
Year:
Season: Oct
Volumen: 2
Number: 4
Pages: 279-281
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental
English abstract 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) - aT2/(a + T), with: Eg(0) = (2.435 ± 0.008) eV, a = (8.7 ± 1.3) x 10-4 eV/K and a = (192 ± 90) K. The bandgap energy of lead iodide at room temperature was found to be 2.277 ± 0.007 eV
Disciplines: Ingeniería
Keyword: Ingeniería de control,
Ingeniería de materiales,
Propiedades ópticas,
Plomo,
Cristalización
Keyword: Engineering,
Control engineering,
Materials engineering,
Optical properties,
Lead,
Crystallization
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