Two Wavelength Polarization-Sensitive Organic Photodetectors Utilizing Bilayer Oriented Fluorene-Type Conjugated Polymers

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  • フルオレン系共役高分子積層配向薄膜を用いた2波長の偏光検出可能な有機受光素子
  • フルオレンケイ キョウヤク コウブンシ セキソウハイコウ ハクマク オ モチイタ 2 ハチョウ ノ ヘンコウ ケンシュツ カノウ ナ ユウキ ジュコウ ソシ

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Abstract

<p>The concept of using a heterostructure with bilayer oriented conjugated polymer films in organic photodetectors (OPDs) is introduced to provide a useful approach to detect two different wavelengths. The characteristics of the inverted-OPDs based on oriented bilayer fluorene-type polymers of ITO/perylene derivative/ poly(9,9-dioctylfluorene-alt-benzothiadiazole)(F8BT)/poly(9,9-dioctylfluorene)(F8)/MoOx/Ag are investigated. The thickness of an F8BT layer is optimized for polarization-sensitive photodetection. When polarized ultraviolet (blue) light is used, the photocurrent ratio of the parallel to the perpendicular condition reachs a maximum of 1.8 (1.5). We demonstrate the possibility of producing two wavelength polarization-sensitive organic photodetectors. This work is anticipated to be useful for the development of polarization-sensitive OPDs.</p>

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