期刊
CERAMICS INTERNATIONAL
卷 46, 期 16, 页码 25066-25072出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.06.293
关键词
Films; Optical properties; Electrical properties; Transition metal oxides; Electrochromic energy storage performances
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1 A2 C1005836]
In this study, we designed a unique method for increasing F-doping concentration in F-doped SnO2 (FTO) films, without the extra addition of NH4F as a doping source, using NaOH acting as a functional additive during ultrasonic spray pyrolysis. The NaOH triggers a chemical reaction with HF, resulting in the presence of dissociated F- acting as a doping source. To optimize the NaOH effect on the transparent conducing performance in the FTO films, we adjusted the volume percentages of the NaOH to 0, 1, 5, and 10 vol% during FTO deposition. Compared with other FTO films, the FTO film prepared with 5 vol% NaOH revealed enhanced carrier concentration (7.81 x 10(20) cm(-3)) generated by the increased F-doping concentration (3.57 at%) and high Hall mobility (27.18 cm(2)/(V S)) through smooth surface morphology. Such behaviors through the NaOH effect resulted in FTO films with decreased sheet resistance (5.3 +/- 0.16 Omega/square), leading to improved electrochromic (EC) energy storage performances of fast switching speed (6.6 s for coloration speed and 8.4 s for bleaching speed) due to faster electrochemical kinetics at the active electrodes, high coloration efficiency (58.1 cm(2)/C) and high specific capacitance (65.2 F/g at 2 A/g) via enhanced electrochemical activity in the active electrodes that widens the transmittance modulation. Therefore, our study suggests a novel method to improve the transparent conducing performances of FTO films for application in EC energy storage devices.
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