The novel n-channel liquid crystal organic field effect transistor (LC-n-OFET): A promising technology for low-power electronics

Ki̇p Ş. Z., Gegi̇n K., Demi̇r A., Köysal O., ÖZTÜRK S., KÖSEMEN A.

Organic Electronics, cilt.125, 2024 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 125
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1016/j.orgel.2023.106965
  • Dergi Adı: Organic Electronics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Chemical Abstracts Core, Compendex, INSPEC
  • Anahtar Kelimeler: Channel length, Dielectric properties, Dipole polarization and anisotropy, LC-n-OFET, Light intensity, Liquid crystals, Mobility
  • İstanbul Üniversitesi-Cerrahpaşa Adresli: Evet

Özet

In this study, a novel n-channel liquid crystal organic field effect transistor (LC-n-OFET) was fabricated using a mixture of E7 nematic liquid crystal (NLC) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) in an OFET cell. The LC-n-OFET performance was investigated regarding dielectric properties, UV illumination sensitivity, and channel length dependence. Output and transfer current-voltage (I–V) characteristics were measured to evaluate the electrical properties in dark and under UV illumination for varying channel lengths. Additionally, the dielectric characteristics of the LC-n-OFET were determined along with the capacitance-frequency response (Ci-f), threshold voltage (VTh), field-effect mobility (μFET), and on/off current ratio (Ion/off) as a function of UV illumination intensity and channel length changes. Electrical measurements showed the Ion/off current ratio is inversely proportional to channel length but directly proportional to UV intensity. Meanwhile, the threshold voltage (VTh) and mobility (μFET) increased with longer channel length and higher light intensity. Overall, the novel LC-n-OFET exhibited promising performance with low VTh, high μFET, and large Ion/off.