AC impedance spectroscopy on Al/p-Si/ZnTPyP/Au heterojunction for hybrid solar cell applications

A p-Silicon/Zn-tetra pyridyl-porphyrin (ZnTPyP) heterojunction was fabricated by forming a ZnTPyP layer on a p-type Si single crystal substrate using a conventional thermal evaporation technique. Complex impedance measurements of the Al/p-Si/ZnTPyP/Au heterojunction were carried out at applied AC-vo...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-03, Vol.736, p.225-235
Main Authors: Shehata, M.M., Abdel-Malik, T.G., Abdelhady, K.
Format: Article
Language:English
Subjects:
AC-impedance spectroscopy
Activation energy
Aluminum
Dielectric properties
Electric currents
Equivalent circuit
Evaporation
Heterojunctions
Hybrid heterojunction
Organic semiconductor (ZnTPyP)
Relaxation time
Silicon
Silicon substrates
Single crystals
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Summary:A p-Silicon/Zn-tetra pyridyl-porphyrin (ZnTPyP) heterojunction was fabricated by forming a ZnTPyP layer on a p-type Si single crystal substrate using a conventional thermal evaporation technique. Complex impedance measurements of the Al/p-Si/ZnTPyP/Au heterojunction were carried out at applied AC-voltage range from 0.2 V to 1 V, temperature range from 303 K to 353 K and over the frequency range from 100HZ to 2 MHz. Impedance spectra of the heterojunction under the standard illumination ranged from 0 to 40 mW/cm2 were reported and analysed. [Display omitted] •A hybrid heterojunction was fabricated by thermal evaporation technique.•AC-measurements of Al/p-Si/ZnTPyP/Au heterojunction was investigated using impedance spectroscopy.•Dielectric properties were obtained and interpreted on the basis of impedance theories.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.11.097