Top-gate LZTO thin-film transistors with PMMA gate insulator by solution process Lan Yue, Haifeng Pu, Shujian Pang, Honglei Li and Qun Zhang EPL, 97 6 (2012) 67006 Published online: 20 March 2012 DOI: 10.1209/0295-5075/97/67006