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High‐Power Density Piezoelectric Energy Harvesting Using Radially Strained Ultrathin Trigonal Tellurium Nanowire Assembly

2013; Volume: 25; Issue: 21 Linguagem: Inglês

10.1002/adma.201300657

1521-4095

Tae Il Lee, Sangmin Lee, Eungkyu Lee, Sungwoo Sohn, Yean Lee, Sujeong Lee, Geondae Moon, Do-Hyang Kim, Youn Sang Kim, Jae Min Myoung, Zhong Lin Wang,

Innovative Energy Harvesting Technologies

A high-yield solution-processed ultrathin (<10 nm) trigonal tellurium (t-Te) nanowire (NW) is introduced as a new class of piezoelectric nanomaterial with a six-fold higher piezoelectric constant compared to conventional ZnO NWs for a high-volume power-density nanogenerator (NG). While determining the energy-harvesting principle in a NG consisting of t-Te NW, it is theoretically and experimentally found that t-Te NW is piezoelectrically activated only by creating strain in its radial direction, along which it has an asymmetric crystal structure. Based upon this mechanism, a NG with a monolayer consisting of well-aligned t-Te NWs and a power density of 9 mW/cm(3) is fabricated.