BROWSE

ITEM VIEW & DOWNLOAD

Photo/electro-stimulated Charge Transfer in Triboelectric Nanogenerator

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Photo/electro-stimulated Charge Transfer in Triboelectric Nanogenerator
Author
Ye, Byeong Uk
Advisor
Baik, Jeong Min
Issue Date
2017-02
Publisher
Graduate School of UNIST
Abstract
Widespread energy harvesting, generating self-sufficient power from the surrounding environment, such as wind, solar and geothermal, have attracted increasing attention in the past decade due to the energy crisis and global warming. Among them, many technological devices converting mechanical energy into other forms of energy or vice versa have been proposed and investigated because of an extended life time, no recharging procedures, and their scalability. Generally, mechanical energy converted into electricity, namely, by using electromagnetic, electrostatic, and piezoelectric effects. Most recently, a new type of power generating device, named as triboelectric nanogenerator (TENG) based on triboelectric effects coupled with electrostatic effects have been demonstrated as powerful means of harvesting mechanical energy from living environment. Part 1. A simple fabrication route for ion gel nanofibers in a triboelectric nanogenerator was demonstrated. Using an electrospinning technique, we could fabricate a large-area ion gel nanofiber mat. The triboelectric nanogenerator was demonstrated by employing an ion gel nanofiber and the device exhibited an output power of 0.37 mW and good stability under continuous operation. Part 2. Understanding the charge transfer mechanism between two surfaces during the physical contact is crucial in the development of triboelectrification-related commercialized products. Here, we report that light illumination can reverse the direction of the charge transfer and significantly increase tribo-charge density occurring at the oxide/polyimide interface. Under light illumination, the surface potential maps of TiOx layer on P3HT:PC61BM/PEDOT:PSS/ITO substrate showed the significant decrease of the work function by approximately 0.2 eV, positioned to be at lower than that of the polyimide and thus increasing the work function difference with the polyimide. The wavelength-dependent measurement of the output open-circuit voltages revealed that the photogenerated electrons from active layer via visible light were accumulated at the surface of TiOx, enhancing the output short-circuit current of the triboelectric nanogenerator by 5 times, supported by the gate voltage-dependent output performance of the nanogenerator with TiOx/SiO2/Si substrate connected to the back gate metal. These results should help design improved energy harvesting devices as well as self-powered selective wavelength photodetectors.
Description
Department of Materials Science Engineering
URI
Go to Link
Appears in Collections:
MSE_Theses_Ph.D.
Files in This Item:
Photoelectro-stimulated Charge Transfer in Triboelectric Nanogenerator.pdfDownload

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qr_code

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU