Customization of MoS<sub>2</sub> Phototransistors via Thiol‐Based Functionalization

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  • Healin Im
    School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon 440‐745 Republic of Korea
  • Arindam Bala
    School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon 440‐745 Republic of Korea
  • Byungjun So
    School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon 440‐745 Republic of Korea
  • Young Jun Kim
    BioNano Health Guard Research Center (H‐GUARD) Daejeon 34141 Republic of Korea
  • Sunkook Kim
    School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon 440‐745 Republic of Korea

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<jats:title>Abstract</jats:title><jats:p>The thiol‐based functionalization of multilayer MoS<jats:sub>2</jats:sub> is performed to customize its electrical and optical performance. Two types of thiol‐terminated organic molecules are utilized: 4‐amino thiophenol (4ATP) for electron‐donating and 4‐nitro thiophenol (4NTP) for electron‐withdrawing. The thiol groups in these molecules chemically bond with MoS<jats:sub>2</jats:sub> at the sulfur vacancies through the simple solution process. 4ATP‐functionalized MoS<jats:sub>2</jats:sub> (4ATP–MoS<jats:sub>2</jats:sub>) transistors exhibit a huge enhancement in the current and the carrier concentration, whereas 4NTP‐functionalized MoS<jats:sub>2</jats:sub> (4NTP–MoS<jats:sub>2</jats:sub>) transistors show the reduction in the film conductance. Moreover, functionalization with 4ATP and 4NTP complementarily modulate the photoresponsive characteristics of MoS<jats:sub>2</jats:sub> transistors. Under 405 nm laser illumination, 4ATP–MoS<jats:sub>2</jats:sub> phototransistors exhibit the enhanced photoresponsivity of 669.10 A W<jats:sup>−1</jats:sup> attributed to the large dark currents. In contrast, 4NTP–MoS<jats:sub>2</jats:sub> phototransistors can achieve faster photoswitching performances than 4ATP–MoS<jats:sub>2</jats:sub>. Therefore, the thiol‐based functionalization can effectively customize the electrical and optical characteristics of multilayer MoS<jats:sub>2</jats:sub>.</jats:p>

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