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      Articles written in Pramana – Journal of Physics

    • A comparative study of graphene and graphite-based field effect transistor on flexible substrate

      KAPIL BHATT CHEENU RANI MONIKA VAID ANKIT KAPOOR PRAMOD KUMAR SANDEEP KUMAR SHILPI SHRIWASTAWA SANDEEP SHARMA RANDHIR SINGH C C TRIPATHI

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      In the present era, there has been a great demand of cost-effective, biodegradable, flexible and wearable electronics which may open the gate to many applications like flexible displays, RFID tags, health monitoring devices, etc. Due to the versatile nature of plastic substrates, they have been extensively used in packaging, printing, etc. However, the fabrication of electronic devices requires specially prepared substrates with high quality surfaces, chemical compositions and solutions to the related fabrication issues along with its non-biodegradable nature. Therefore, in this report, a cost-effective, biodegradable cellulose paper as an alternative dielectric substrate material for the fabrication of flexible field effect transistor (FET) is presented. The graphite and liquid phase exfoliated graphene have been used as the material for the realisation of source, drain and channel on cellulose paper substrate for its comparative analysis.The mobility of fabricated FETs was calculated to be $\rm{83 cm^{2}/V s}$ (holes) and $\rm{33 cm^{2}/V s}$ (electrons) for graphite FET and $\rm{100 cm^{2}/V s$ (holes) and $\rm{52 cm^{2}/V s}$ (electrons) for graphene FET, respectively. The output characteristic of the device demonstrates the linear behaviour and a comprehensive increase in conductance as a function of gate voltages. The fabricated FETs may be used for strain sensing, health care monitoring devices, human motion detection, etc.

    • High-performance ultra-low leakage current graphene-based screen-printed field-effect transistor on paper substrate

      KAPIL BHATT SANDEEP KUMAR C C TRIPATHI

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      Exploiting the advantages of additive patterning process over complex fabrication processes, herein we report the fabrication of field-effect transistor (FET) using the screen-printing method. The graphene conductive composite dielectric ink as the channel and the dielectric layer respectively was screen printed on cellulose paper substrate. The fabricated device shows the hole and electron mobility of $\rm{135 cm^{2}/V s}$ and $\rm{98 cm^{2}/V s}$ respectively with an ultra-low leakage current of $\sim 25 \rm{nA}$. The proposed technique can be used for large-scale roll-to-roll commercial manufacturing of disposable FET-based sensors such as temperature and IR sensors, health monitoring devices etc.

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