Correlation between Inner Electric Field and Photocurrent of Zn-Phthalocyanine Schottky-Barrier Cells

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Abstract

An electroabsorption (EA) study is carried out at an electric-field modulation frequency ω<SUB>m</SUB>⁄(2π) of 1 Hz for two types of typical organic Schottky-barrier cell, namely, Au/Zn-phthalocyanine (ZnPc)/Al and Au/ZnPc/In/Al, in order to elucidate the role of the inner electric field in photocurrent (<I>I</I><SUB>photo</SUB>) generation. From the bias dependence of the 1F- and 2F-EA intensities measured at the frequencies of ω<SUB>m</SUB> and 2ω<SUB>m</SUB>, respectively, it is shown that the inner electric field <I>E</I><SUB>0</SUB> as well as the modulation electric field <I>E</I><SUB>m</SUB> is quenched in the ZnPc layer with a forward bias larger than ∼1 V. For Au/ZnPc/Al, a good correlation is observed between <I>E</I><SUB>0</SUB> and <I>I</I><SUB>photo</SUB>, which indicates that <I>I</I><SUB>photo</SUB> is generated by <I>E</I><SUB>0</SUB>. For Au/ZnPc/In/Al, on the other hand, no correlation is observed between <I>E</I><SUB>0</SUB> and <I>I</I><SUB>photo</SUB>. An interpretation of the latter is that <I>I</I><SUB>photo</SUB> is caused by an increase in charge-injection probability at the ZnPc/In interface as a result of the trapping of photogenerated charges in the interface region. For both systems, the depletion layer is detected by capacitance-voltage measurement at 0.2 Hz.

Journal

  • Japanese Journal of Applied Physics

    Japanese Journal of Applied Physics 44(1), 60-66, 2005-01-15

    The Japan Society of Applied Physics

References:  12

Codes

  • NII Article ID (NAID)
    10014321718
  • NII NACSIS-CAT ID (NCID)
    AA10457675
  • Text Lang
    ENG
  • Article Type
    ART
  • Journal Type
    大学紀要
  • ISSN
    00214922
  • NDL Article ID
    7258267
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A375
  • Data Source
    CJP  NDL  IR  J-STAGE  Crossref 
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