Organic thin-film solar cells with a Cu anode : Improvement of the photovoltaic properties on aging in air

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抄録

The photovoltaic properties of a Ga-doped ZnO (GZO)/3,4,9,10-perylene-tetracarboxyl-bis-benzimidazole (PTCBI)/Zn-phthalocyanine (ZnPc)/Cu heterojunction cell(cell A) and a GZO/ZnPc/Cu Schottky-barriercell(cell B) were investigated. The energy conversion efficiency η of cell A was only 0.02% immediately after the device preparation but improved to 0.46% after aging for 24 days in air. To elucidate the mechanism of this aging effect, photocurrent action and electro-absorption spectra were measured for cell B. The results reveal that a Schottky barrier exists at the ZnPc/Cu interface which blocks the transport of photogenerated holes to the Cuelectrode, and the barrier height is reduced by a white-light illumination of the device after aging. The change in barrier height is attributed to the formation of electron traps at the surface of the ZnPc layer on aging that trap photogenerated electrons.

収録刊行物

  • Journal of Applied Physics

    Journal of Applied Physics 106(6), 064510-1-064510-8, 2009

    American Institute of Physics

各種コード

  • NII論文ID(NAID)
    120005694037
  • 本文言語コード
    ENG
  • 資料種別
    journal article
  • ISSN
    0021-8979
  • データ提供元
    IR 
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