Polycrystalline lead iodide films produced by solution evaporation and tested in the mammography X-ray energy range

Autor(es)

Condeles, J. F. ^[1] ; Mulato, M. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Triangulo Mineiro, Inst Exact Sci Nat & Educ, Dept Phys, BR-38064200 Uberaba, MG - Brazil

^[2] Univ Sao Paulo, Dept Phys, Fac Philosophy Sci & Letters Ribeirao Preto, BR-14040901 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS; v. 89, p. 39-44, FEB 2016.
• Citações Web of Science: 10

Resumo

Lead iodide polycrystalline films have been deposited on corning glass substrates using solution evaporation in oven. Films 6 mu m-thick were obtained with full coverage of the substrates as verified by scanning electron microscopy. Some pin-holes were observable. X-ray diffraction revealed a crystalline structure corresponding to the 4 H-PbI2 polytype formation. Polarized Raman scattering experiments indicated a lamellar structure. Anisotropy was also investigated using depolarization ratio calculations. The optical and electrical properties of the samples were investigated using photoluminescence and dark conductivity as a function of temperature, respectively. Activation energies of 0.10 up to 0.89 eV were related to two main electrical transport mechanisms. Films were also exposed to X-ray irradiation in the mammography X-ray energy range. The detector produced was also exposed to X-ray from 5 mR up to 1450 mR. A linear response was observed as a function of dose with a slope of 0.52 nA/mm(2) per mR. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 14/09562-4 - Biossensores microeletrônicos associados a técnicas eletroquímicas
• Beneficiário: Marcelo Mulato
• Modalidade de apoio: Auxílio à Pesquisa - Regular