Solution-Processable meso-Triarylamine Functionalized Porphyrins with a High Mobility and ON/OFF Ratio in Bottom-Gated Organic Field-Effect Transistors
journal contributionposted on 09.10.2020, 16:10 by Komal Kurlekar, Anshika Anjali, Srinita Sonalin, Predhanekar Mohamed Imran, Samuthira Nagarajan
A series of metal-free porphyrin molecules with functionalized triarylamines at the meso-position are designed and synthesized. All the functionalized porphyrins possess good thermal stability and high decomposition temperatures over 422 °C and also exhibited electrochemical reproducibility. The calculated ionization potentials are in the range of −5.01 to -5.42 eV, and electron affinity levels are in between −2.47 and −2.91 eV, which supports stable charge ejection. Organic field-effect transistor (OFET) devices with bottom-gate/top-contact architecture are fabricated by a solution-processable technique. OFETs with an active layer of porphyrin with electron-accepting trifluorophenyl groups gave the highest charge carrier mobility of 4.4 cm2/Vs and an on/off ratio of 107. The obtained results indicate these compounds to be efficient hole-transporting materials. This research work presents the highest mobilities of the porphyrins reported until now.
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Organic field-effect transistorresearch workelectron-accepting trifluorophenyl ...metal-free porphyrin moleculessolution-processable techniquecharge carrier mobility-5.42 eV10 7electron affinity levelselectrochemical reproducibilityBottom-Gated Organic Field-Effect T...charge ejectionTriarylamine Functionalized Porphyrinshole-transporting materialsHigh Mobilityfunctionalized porphyrinsfunctionalized triarylaminesOFETdecomposition temperaturesionization potentialsSolution-Processable meso