Research: Organic TFTs with improved stability

The performance of organic thin‑film transistors often degrades when the devices are exposed to air. This is generally ascribed to the generation of trap states as a result of the oxidation of the organic semiconductor. One strategy to improve the stability of organic transistors is the synthesis of conjugated semiconductors with a larger ionization potential. However, many organic semiconductors with large ionization potential show relatively low carrier mobilities, due to the fact that these materials tend to show poor molecular ordering.

We have investigated the performance and stability of transistors based on a new organic semiconductor developed by Tatsuya Yamamoto and Kazuo Takimiya, dinaphtho-[2,3-b:2',3'-f ]thieno[3,2-b]thiophene (DNTT). Compared with pentacene, DNTT has a larger ionization potential (5.4 eV vs. 5.0 eV), yet it shows a high degree of molecular ordering. Consequently, pentacene and DNTT transistors show similar initial performance (mobility around 1 cm²/Vs), but DNTT transistors show significantly better long-term stability.

Back to Research

Dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) thin-film transistors with improved performance and stability U. Zschieschang, F. Ante, D. Kälblein, T. Yamamoto, K. Takimiya, H. Kuwabara, M. Ikeda, T. Sekitani, T. Someya, J. Blochwitz-Nimoth, H. Klauk Organic Electronics, vol. 12, no. 8, pp. 1370-1375, June 2011

Flexible Low-Voltage Organic Transistors and Circuits Based on a High-Mobility Organic Semiconductor with Good Air Stability U. Zschieschang, T. Yamamoto, K. Takimiya, H. Kuwabara, M. Ikeda, T. Sekitani, T. Someya, H. Klauk Advanced Materials, vol. 22, no. 9, pp. 982-985, February 2010

Organic Transistors Based on Di(phenylvinyl)anthracene: Performance and Stability H. Klauk, U. Zschieschang, R. T. Weitz, H. Meng, F. Sun, G. Nunes, D. E. Keys, C. R. Fincher, Z. Xiang Advanced Materials, vol. 19, no. 22, pp. 3882-3887, November 2007