Photoconductivity in Materials Research

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Abstract

    Photoconductivity is the incremental change in the electrical conductivity of a semiconductor or insulator, upon illumination. The behaviour of photoconductivity with photon energy, light intensity and temperature, and its time evolution and frequency dependence, can reveal a great deal about carrier generation, transport and recombination processes. Many of these processes now have a sound theoretical basis and so it is possible, with due caution, to use photoconductivity as a diagnostic tool in the study of new electronic materials and devices. This chapter describes the main steady-state and transient photoconductivity techniques applied in the investigation of semiconductors whose performance is limited by the presence of localised electronic states. These materials tend to be disordered, and possess low carrier mobilities and short free-carrier lifetimes in comparison with crystalline silicon. They are often prepared as thin films, and are of interest for large-area application e.g. in solar cells, display backplane transistors, photoemissive devices such as organic LEDs and medical imagers. However, examples of where these techniques have been useful in the study of defective crystalline semiconductors are also given. The approach followed here is by way of an introduction to the techniques, the physics supporting them, and their applications, it being understood that readers requiring more detailed information will consult the references provided.
    Original languageEnglish
    Title of host publicationSpringer Handbook of Electronic and Photonic Materials
    EditorsSafa Kasap, Peter Capper
    Place of PublicationSwitzerland
    PublisherSpringer International Publishing
    Pages151-174
    Number of pages23
    Edition2
    ISBN (Print)9783319489315
    DOIs
    Publication statusPublished - Sep 2017

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    photoconductivity
    readers
    carrier lifetime
    carrier mobility
    electronics
    luminous intensity
    transistors
    light emitting diodes
    solar cells
    illumination
    insulators
    electrical resistivity
    physics
    acoustics
    photons
    silicon
    thin films
    temperature
    energy

    Cite this

    Reynolds, S. (2017). Photoconductivity in Materials Research. In S. Kasap, & P. Capper (Eds.), Springer Handbook of Electronic and Photonic Materials (2 ed., pp. 151-174). Switzerland: Springer International Publishing. https://doi.org/10.1007/978-3-319-48933-9
    Reynolds, Stephen. / Photoconductivity in Materials Research. Springer Handbook of Electronic and Photonic Materials. editor / Safa Kasap ; Peter Capper. 2. ed. Switzerland : Springer International Publishing, 2017. pp. 151-174
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    Reynolds, S 2017, Photoconductivity in Materials Research. in S Kasap & P Capper (eds), Springer Handbook of Electronic and Photonic Materials. 2 edn, Springer International Publishing, Switzerland, pp. 151-174. https://doi.org/10.1007/978-3-319-48933-9

    Photoconductivity in Materials Research. / Reynolds, Stephen.

    Springer Handbook of Electronic and Photonic Materials. ed. / Safa Kasap; Peter Capper. 2. ed. Switzerland : Springer International Publishing, 2017. p. 151-174.

    Research output: Chapter in Book/Report/Conference proceedingChapter

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    AB - Photoconductivity is the incremental change in the electrical conductivity of a semiconductor or insulator, upon illumination. The behaviour of photoconductivity with photon energy, light intensity and temperature, and its time evolution and frequency dependence, can reveal a great deal about carrier generation, transport and recombination processes. Many of these processes now have a sound theoretical basis and so it is possible, with due caution, to use photoconductivity as a diagnostic tool in the study of new electronic materials and devices. This chapter describes the main steady-state and transient photoconductivity techniques applied in the investigation of semiconductors whose performance is limited by the presence of localised electronic states. These materials tend to be disordered, and possess low carrier mobilities and short free-carrier lifetimes in comparison with crystalline silicon. They are often prepared as thin films, and are of interest for large-area application e.g. in solar cells, display backplane transistors, photoemissive devices such as organic LEDs and medical imagers. However, examples of where these techniques have been useful in the study of defective crystalline semiconductors are also given. The approach followed here is by way of an introduction to the techniques, the physics supporting them, and their applications, it being understood that readers requiring more detailed information will consult the references provided.

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    Reynolds S. Photoconductivity in Materials Research. In Kasap S, Capper P, editors, Springer Handbook of Electronic and Photonic Materials. 2 ed. Switzerland: Springer International Publishing. 2017. p. 151-174 https://doi.org/10.1007/978-3-319-48933-9