Fluorine-doped tin oxide films for supercapacitor applications

Authors

Genes Maylem ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Laureen Ida Ballesteros ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Joybelle Lopez ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Luce Vida Sayson ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Horace Andrew Husay ⋅ PH National Institute of Physics, University of the Philippines Diliman
Armando Somintac ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

We report the effect of fluorine (F)-doping on the specific capacitance, C_s, of tin oxide (TO). TO films of various doping concentrations (0, 20, 40, and 60 at.%) were deposited on stainless steel substrates at 500°C via the spray pyrolysis method. The appearance of the E_g (488.9 cm^-1), A_1g (638 cm^-1), and B_2g (776 cm^-1) modes in the Raman spectra verify the presence of TO. The shift and broadening of these fundamental peaks indicate the effective incorporation of F into the TO lattice. The cyclic voltammetry (CV) curves suggest that the electrode films follow a pseudocapacitive mechanism. The highest C_s was calculated from FTO 40% (4855 mF g^-1), followed by FT0 20% (1134 mF g^-1), FTO 60% (557 mF g^-1), and TO (520 mF g^-1). The initial increase in C_s is
attributed to the increase in the electrical conductivities of the films as more dopant was added. Upon adding 60 at.% F, TO has already exceeded its saturation point and the excess dopants only caused disorder in the structure, consequently resulting in a decreased electron mobility and electrical conductivity.

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Issue

2018: Proceedings of the 36th Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2018-PA-01

Section

Poster Session A (Materials Science, Instrumentation, and Photonics)

Published

2018-05-18

How to Cite

[1]

G Maylem, LI Ballesteros, J Lopez, LV Sayson, HA Husay, and A Somintac, Fluorine-doped tin oxide films for supercapacitor applications, Proceedings of the Samahang Pisika ng Pilipinas 36, SPP-2018-PA-01 (2018). URL: https://proceedings.spp-online.org/article/view/SPP-2018-PA-01.