Effective performance improvement of organic thin film transistors by using tri-layer insulatorsYao Ni, Jianlin Zhou, Yuanyuan Hao, Hang Yu, Yanyun Li, Zhenzhen Ruan and Ping GanEur. Phys. J. Appl. Phys., 83 2 (2018) 20201DOI: https://doi.org/10.1051/epjap/2018180138