講演情報
[9p-C214-17]Synergistic Integration of Plasmonic-Photogating Enhancement of Low-Voltage Organic Phototransistors
〇(D)Reaksmey EK1, Layheng Chea1, Tianshuo Wang1, Masahiro Minagawa2, Sachiko Jonai1, Yasuo Ohdaira1, Akira Baba1, Kazunari Shinbo1 (1.Niigata University, 2.National Institute of Technology, Nagaoka College)
キーワード：
Surface plasmon resonance、Electrolyte-gate phototransistor、Organic solar cell
Electrolyte-gated organic phototransistors (EGOPTs) are promising low-power photodetectors owing to their low-voltage operation enabled by electric double-layer formation at the electrolyte/semiconductor interface. However, their photoresponsivity remain limited. In this study, we demonstrate a dual enhancement strategy combining localized surface plasmon resonance (LSPR) of Ag nanoparticles (AgNPs) and photovoltage assisted gating from an organic solar cell (OSC). The EGOPT was fabricated with a Glass substrate/CrAu electrodes/P3HT incorporating AgNPs/Graphene Oxide (GO)/ Phosphate-Buffered Saline (PBS)/Pt gate electrode structure as shown in Fig. 1. AgNPs were immobilized on substrate surface via chemical bonding between functional group of (3-mercaptopropyl)trimethoxysilane (MPTMS) and AgNPs. The incorporation of AgNPs enhanced the photoresponse of the EGOPT, as shown in the transfer curves in Fig. 2. This enhancement is attributed to the plasmonic effect induced by AgNPs which enhances the light absorption in the P3HT layer. Furthermore, integrating OSC as photogating element further improved the light response of the device which can be seen clearly in the transfer curves. Moreover, the AgNPs/P3HT device integrated with OSC achieved a maximum detectivity of 7.1×109 Jones and responsivity of 83.19 mA/W under white light illumination (5 mW/cm2), corresponding to a 57-fold enhancement compared with the pristine Pt-gated device as shown in Fig. 3. These results demonstrate that the synergistic combination of AgNP plasmonic and OSC photogating provides an effective strategy for realizing highly sensitive, low-voltage organic photodetectors for future applications.