Nanogenerators for self-powering nanosystems and piezotronics for smart MEMS/NEMS
Type
Conference PaperAuthors
Wang, Zhong Lin
Date
2011-01Permanent link to this record
http://hdl.handle.net/10754/598936
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Show full item recordAbstract
Two new fields are introduced to MEMS/NEMS: a nanogenerator that harvests mechanical energy for powering nanosystems, and strained induced piezotronics for smart MEMS. Fundamentally, due to the polarization of ions in a crystal that has non-central symmetry, such as ZnO, GaN and InN, a piezoelectric potential (piezopotential) is created in the crystal by applying a stress. The principle of harvesting irregular mechanical energy by the nanogenerator relies on the piezopotenital driven transient flow of electrons in external load, which can be resulted from body motion, muscle stretching, breathing, tiny mechanical vibration/disturbance, sonic wave etc. As of today, a gentle straining can output 1-3 V at an instant output power of ∼2 μW from an integrated nanogenerator of a very thin sheet of 1 cm2 in size. This technology has the potential applications for power MEMS/NEMS that requires a power in the μW to mW range. Furthermore, we have replaced the externally applied gate voltage to a CMOS field effect transistor by the strain induced piezopotential as a "gate" voltage to tune/control the charge transport from source to drain. The devices fabricated by this principle are called piezotronics, with applications in strain/force/pressure triggered/controlled electronic devices, sensors and logic units.Citation
Wang ZL (2011) Nanogenerators for self-powering nanosystems and piezotronics for smart MEMS/NEMS. 2011 IEEE 24th International Conference on Micro Electro Mechanical Systems. Available: http://dx.doi.org/10.1109/MEMSYS.2011.5734375.Sponsors
Thanks to the support from DARPA, BES DOE, NIH,NSF, Airforce, NASA, KAUST and WPI (NIMS). Thanksto my prior and current group members and collaboratorsfor their contributions.ae974a485f413a2113503eed53cd6c53
10.1109/MEMSYS.2011.5734375