2021年第68回応用物理学会春季学術講演会

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17 ナノカーボン » 17.3 層状物質

[19a-Z31-1~11] 17.3 層状物質

2021年3月19日(金) 09:00 〜 12:00 Z31 (Z31)

青木 伸之(千葉大)

10:45 〜 11:00

[19a-Z31-7] Photo Enhanced Electrical Properties of Organic Dye Doped MoS2 FET Sensor

〇(DC)Md Iftekharul Alam1、Tsuyoshi Takaoka1、Hiroki Waizumi1、M. Shamim Al Mamun1、Yudai Tanaka1、Kosei Takahashi1、Tadahiro Komeda2、Atsushi Ando3 (1.Tohoku Univ.、2.IMRAM, Tohoku Univ.、3.Nanoelectronics Research Institute, AIST)

キーワード:MoS2,FET,Methylene blue, Photo current,n-doping,charge transfer

The MoS2 is a proclaimed candidate for a channel material of the FET sensor due to its significant electrical and optoelectrical properties like the high on-off ratio and carrier mobility, in addition to the high sensitivity to the light injection. It is expected that pi(π) conjugated organic dye molecules like methylene blue(MB) when adsorbed on MoS2 FETenhance such a photoresponse behavior under light injection.We focus on how the electrical properties of MoS2 FET doped with the MB molecule changes with the light illumination. Two maximum photocurrent peaks in were observed between 600nm and 670nm for all cases. An additional shoulder is appeared at around 500nm wavelength that is absent in pristine MoS2 FET under light injection. That maximum photocurrent enhancement is due to the charge transfer from the LUMO of MB to the conduction band of MoS2 while the additional shoulder can be attributed by the formation of S bond S or S bond Mo coordination interaction with MoS2.