A study of the charge distribution and output characteristics of an ultra-thin tribo-dielectric layer

• Published in: Nano energy 2019-08, Vol.62, p.458-464
• Main Authors: Kim, Daewon, Kim, Weon-Guk, Jin, Ik Kyeong, Park, Hongkeun, Im, Sung-Gap, Choi, Yang-Kyu
• Format: Article
• Language: English
• Subjects: Initiated chemical vapor deposition; PFDMA; Power generation; Tribo-dielectric layer; Triboelectric energy harvester; Triboelectric nanogenerator; Ultra-thin thickness
• ISSN: 2211-2855
• DOI: 10.1016/j.nanoen.2019.05.070

A triboelectric nanogenerator (TENG) with an ultra-thin thickness of a tribo-dielectric layer (TDL) composed of poly heptadecafluorodecyl methacrylate (PFDMA) is demonstrated. The thickness of the PFDMA, which serves as the TDL, was precisely controlled within a range of 0.5 μm–12 μm through the use of initiated-chemical vapor deposition (i-CVD). The relationship between the TDL thickness and the output characteristics was analyzed by demonstrating the ultra-thin TDL thickness, which is the thinnest thickness polymer TDL ever reported. As the TDL thickness is increased, the short-circuit current (ISC) and the transferred charge (QTR) both increase while the open-circuit voltage (VOC) remains constant. Because a TENG with the ultra-thin TDL shows a different tendency between QTR and the total charge (QTDL) in the TDL, modeling is also carried out to gain a comprehensive understanding of the TDL thickness and output characteristics. [Display omitted] •Ultra-thin tribo dielectric layer (TDL) fabricated by using initiate chemical deposition.•The modeling about relation between the TDL thickness and output characteristics is reinforced and verified.•Through ultra-thin TDL, bulk distribution of triboelectric charge studied in-depth.•The characteristics of PFDMA as TDL are analyzed.