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Influence of solution rate and substrate temperature on the properties of lead iodide films deposited by spray pyrolysis

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Abstract

Polycrystalline lead iodide (PbI2) thin films have been deposited by spray pyrolysis method using N,N-dimethylformamide (DMF) as solvent as a function of several deposition parameters. DMF is used as an alternative to water due to the larger solubility limit of PbI2 in this solvent. In this work, the solution rate during the deposition time of 3 h was varied in the range of 0.11 cm3/min up to 0.30 cm3/min. A growth rate varying from 19 Å s−1 up to 47 Å s−1 was obtained as a function of solution rate. Dark current as a function of temperature for the final films reveals that for larger solution rates smaller values of electrical resistivity is obtained. For a solution rate of 0.30 cm3/min, an electrical transport activation energy (E a) of about 0.65 eV was measured for the whole temperature range. On the other hand, for the sample deposited with a solution rate of 0.11 cm3/min, two main transport mechanisms can be observed with an activation energy of about 1.23 eV for temperatures above 50 °C. The effect of substrate temperature is also discussed. Samples were deposited in the temperature range of 170 °C up to 250 °C with a fixed solution rate of 0.16 cm3/min. In addition, the films were exposed to X-ray irradiation in the mammography diagnosis region, using a molybdenum (Mo) anode and a peak tube potential between 26 and 36 kV (equivalent photon energies between 10 keV and 15 keV).

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Acknowledgements

The authors thank T. Ghilardi Netto for experimental help. This work has been supported by FAPESP, CAPES and CNPq.

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Authors and Affiliations

  1. Universidade Federal do Triângulo Mineiro (UFTM), Av. Frei Paulino 30, Uberaba, MG, 38025-180, Brazil

    J. F. Condeles

  2. Departamento de Física e Matemática, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, SP, 14040-901, Brazil

    M. Mulato

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Condeles, J.F., Mulato, M. Influence of solution rate and substrate temperature on the properties of lead iodide films deposited by spray pyrolysis. J Mater Sci 46, 1462–1468 (2011). https://doi.org/10.1007/s10853-010-4947-9

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