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Investigation of Charge distribution in an Electric double layer capacitor
Kuantama Endrowednes,Darma Jessi,성열문(Youl-Moon Sung),김광태(Kwang-Tae Kim) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
The use of the pulsed electro acoustic (PEA) method allowed us to perform the direct observations of spatio-temporal charge distributions in Electric double layer capacitors (EDLCs) based on polarizable nanoporous carbonaceous electrode. The negative charge density became the maximum, about 205 C/㎥at the region where was near to collector layer in EDLCs for case V<SUB>DC</SUB> = 2.5 V, while the positively charged density became the maximum, about 61.1 C/㎥ at the region where it was located around the cathode layer. The PEA measurement used here is a very useful method to quantitively investigates the spatio-temporal charge distribution in EDLCs.
최우진(Woo-Jin Choi),김지훈(Ji-Hoon Kim),정기영(Ki-Young Jung),Jessie Darma,추영배(Young-Bae Choo),성열문(Youl-Moon Sung),곽동주(Dong-Joo Kwak) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In this study, commercially available polyethylene terephthalate(PET), which is widely used as a substrate of flexible electronic devices, was modified by dielectric barrier discharge(DBD) method in an air condition at atmospheric pressure, and aluminium - doped zinc oxide (ZnO:Al) transparent conducting film was deposited on PET substrate by r. f. magnetron sputtering method. Surface analysis and characterization of the plasma-treated PET substrate was carried out using contact angle measurements, X-ray Photoelectron Spectroscopy(XPS) and Atomic Force Microscopy (AFM). Especially the effect of surface state of PET substrate on some important properties of ZnO:Al transparent conducting film such as electrical and morphological properties and deposition rate of the film, was studied experimentally. The results showed that the contact angle of water on PET film was reduced significantly from 62° to 43° by DBD surface treatment at 20 min. of treatment time. The plasma treatment also improved the deposition rate and electrical properties. The deposition rate was increased almost linearly with surface treatment time. The lowest electrical resistivity as low as 4.97×10-3[Ω-㎝] and the highest deposition rate of 234[Åm/min] were obtained in ZnO:Al film with surface treatment time of 5min. and 20min., respectively.