title: Lithium-doped zinc oxide nanowires-polymer composite for high performance flexible piezoelectric nanogenerator.
abstract: We present a method to develop high performance flexible piezoelectric nanogenerators (NGs) by employing Li-doped ZnO nanowires (NWs). We synthesized Li-doped ZnO NWs and adopted them to replace intrinsic ZnO NWs with a relatively low piezoelectric coefficient. When we exploited the ferroelectric phase transition induced in Li-doped ZnO NWs, the performance of the NGs was significantly improved and the NG fabrication process was greatly simplified. In addition, our approach can be easily expanded for large-scale NG fabrication. Consequently, the NGs fabricated by our simple method exhibit the excelling output voltage and current, which are stable and reproducible during periodic bending/releasing measurement over extended cycles. In addition, output voltage and current up to ∼ 180 V and ∼ 50 μA, respectively, were obtained in the large-scale NG. The approach introduced here extends the performance limits of ZnO-based NGs and their potentials in practical applications.
authors.affiliation: Department of Electrical Engineering, Chungnam National University , Yuseong-Gu, Daejeon 305-764, Korea.
authors.forename: Sung-Ho
authors.initials: SH
authors.lastname: Shin
authors.forename: Young-Hwan
authors.initials: YH
authors.lastname: Kim
authors.forename: Min Hyung
authors.initials: MH
authors.lastname: Lee
authors.forename: Joo-Yun
authors.initials: JY
authors.lastname: Jung
authors.forename: Jae Hun
authors.initials: JH
authors.lastname: Seol
authors.forename: Junghyo
authors.initials: J
authors.lastname: Nah
keywords: ferroelectricity; flexible electronics; lithium doped zinc oxide nanowires; piezoelectric nanogenerator