2019年第80回応用物理学会秋季学術講演会

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12 有機分子・バイオエレクトロニクス » 12.3 機能材料・萌芽的デバイス

[20p-PA3-1~42] 12.3 機能材料・萌芽的デバイス

2019年9月20日(金) 13:30 〜 15:30 PA3 (第一体育館)

13:30 〜 15:30

[20p-PA3-11] Performance Study of Near-Infrared Organic Photodetectors based on a Phthalocyanine Derivative and a Fullerene Derivative with Different Blend Ratios

〇(M2)Shahriar Kabir1、Yukiko Takayashiki1、Jun-ichi Hanna1、Hiroaki Iino1 (1.Tokyo Tech)

キーワード:organic photodetector, liquid crystalline semiconductor, near-infrared photodetector

In this work, we studied the static and dynamic performance of NIR organic photodetectors prepared with a binary blend of 1,4,8,11,15,18,22,25-octaocltyl-phthalocyanine (8H2Pc) and a fullerene derivative, Phenyl-C61-butyric acid methyl ester (PC61BM). The materials were blended in weight ratios of 4:1 and 1:1 (8H2Pc:PC61BM) and used as the active layer to prepare vertical OPDs with inverted architecture. We observed that OPDs prepared with the 4:1 blend ratio showed higher specific detectivity and responsivity. The best performing device showed very good maximum specific detectivity, D*max = (Jph/Ilight)/(2qJd)1/2 = 2.87×1013cmHz1/2/W, maximum responsivity, Rmax = 1.94A/W and maximum Jph/Jd ratio = 1.35×104 at -2V bias. We think that the OPDs prepared with 4:1 blend ratio perform better because of higher absorption in the NIR region by the blend material. Therefore, in this 8H2Pc:PC61BM blend system, PC61BM is not necessarily acting as an acceptor but it is improving the thin film morphology of the active layer.