The low mobility and large contact resistance in organic thin-film transistors (OTFTs) are the two major limiting factors in the development of high-performance organic logic circuits. Here, solution-processed high-performance OTFTs and circuits are reported with a polymeric gate dielectric and 6,6 bis (trans-4-butylcyclohexyl)-dinaphtho[2,1-b:2,1-f]thieno[3,2-b]thiophene (4H–21DNTT) for the organic semiconducting layer. By optimizing and controlling the fabrication conditions, a high saturation mobility of 8.8 cm2 V−1 s−1 was demonstrated as well as large on/off ratios (> 106) for relatively short channel lengths of 15 μm and an average carrier mobility of 10.5 cm2 V−1 s−1 for long channel length OTFTs (> 50 μm). The pseudo-CMOS inverter circuit with a channel length of 15 μm exhibited sharp switching characteristics with a high signal gain of 31.5 at a supply voltage of 20 V. In addition to the inverter circuit, NAND logic circuits were further investigated, which also exhibited remarkable logic characteristics, with a high gain, an operating frequency of 5 kHz, and a short propagation delay of 22.1 μs. The uniform and reproducible performance of 4H–21DNTT OTFTs show potential for large-area, low-cost real-world applications on industry-compatible bottom-contact substrates.
Herein,6,-dinaphtho[2,1-b:2′,1′-f ]thieno [3,2-b]thiophene (5H-21DNTT)-a solution-processable derivative of DNTT-was characterized and studied for its potential as a crystalline solution-processed organic semiconductor to achieve high mobility and stable organic thin-film transistor (OTFT) operation. The performance of a bottom-gate, bottomcontact OTFT with a 5H-21DNTT semiconductor was analyzed with different polymeric organic gate dielectrics via various solution-processed techniques. In comparison to other polymeric gate dielectrics, Parylene C exhibited a superior performance for 5H-21DNTT OTFT devices, and the OTFT devices showed a remarkable average mobility of 10.9 cm 2 V -1 s -1 , as well as a maximum mobility exceeding 15 cm 2 V −1 s −1 , with a 100% reliability factor.In recent years, organic thin-film transistors (OTFTs) have been extensively studied in the pursuit of achieving low-cost, large-area, and flexible electronics. [1][2][3] Owing to the unique properties of organic semiconductors (OSCs), OTFTs are potential candidates for realizing future display applications, [4,5] large-area sensor arrays, [6,7] gas and biochemical sensors, [8][9][10] and radio-frequency identification (RFID) tag applications. [11,12] The solution processability of OSCs is the most promising parameter to facilitate low-cost mass production of novel device applications via printing techniques on flexible and large-area substrates. [13][14][15][16]
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