[D-8] Optoelectronics and Thermoelectronic Devices

[D-8-01] Study of Near-infrared Organic Photodetectors with Octa-substituted Alkyl and Alkoxy Phthalocyanine Derivatives

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

Presentation style: On-site (in-person)

https://doi.org/10.7567/SSDM.2022.D-8-01

In this study, near-infrared photodetectors with octa-substituted alkyl and alkoxy phthalocyanine derivatives were realized and compared. The photodetectors were prepared with a bulk heterojunction active layer where each of the phthalocyanine derivatives acted as the donor and phe-nyl-C61-butyric-acid-methyl-ester (PCBM) acted as the acceptor. By varying the blend ratio of the donor and acceptor materials, the photo current output was improved and maximum responsivity of 0.7 A/W and 0.0092 A/W were achieved for the alkyl phthalocyanine:PCBM and alkoxy phthalocyanine:PCBM devices, respectively, at 740 nm with -1 V bias. The superior performance was attributed to the better intermixed condition of the bulk heterojunction active layer due to the weak intermolecular interactions of the alkyl phthalocyanine material. High responsivity of the demonstrated organic photodetector makes it suitable for practical applications.