Abstract
In this study: various amounts of Li2CO3 powders were mixed into NiO powders to fabricate the Li- added NiO (NiO:Li) targets. The electrochromic films of LiNiO were deposited on ITO glasses at room temperature (R.T.) by RF magnetron sputtering. The thicknesses of electrochromic LiNiO films were kept about 200 nm. The ECD device was constructed with structure of Glass/ITO/ LiNiO /Gel-electrolyte/ITO/Glass. The results indicated that the optimal electrochromic characteristics of Li0.16Ni0.58O thin films could be obtained by 10 wt% Li2CO3 added NiO target. The optimized characteristics of ECDs could be achieved with the intercalation charge (Q) of 11.93 mC/cm2, the optical density (ΔOD) of 0.38, the transmittance change (ΔT) of 44.1%, and the coloring efficiency (η) of 31.8 cm2/C at the wavelength of 550 nm by setting voltage of 3.2V. The results demonstrate that the doping of Li+ ions into NiO films can effectively enhance the characteristics of ECD devices. The reason may due to the increased amount of charge stored in the electrochromic devices (ECDs).
Highlights
Facing the growing energy crisis, studies have suggested that establishing the energy-saving system is more effectively than developing new energy sources continuously
The results demonstrate that the doping of Li+ ions into nickel oxide (NiO) films can effectively enhance the characteristics of electrochromic devices (ECDs) devices
The electrochromic LiNiO films were deposited on indium tin oxide (ITO) glasses at R.T. by RF
Summary
Facing the growing energy crisis, studies have suggested that establishing the energy-saving system is more effectively than developing new energy sources continuously. If the coloring characteristics and ion storage capacity of the NiO thin film can be enhanced, the application of the ECD or CECD devices must be greatly promoted. The characteristics of electrochromic films can be effectively enhanced by Li-doping [6,7,8,9,10,11]. The electrolyte and electrochromic films in the ECDs both contain lithium ions which will elevate the rate of charge transfer and enhance the characteristics of ECDs. The amount of charge storage was expected to be raised by doping of Li+ into NiO films, which makes ECDs operating optimally. The ECD devices with the structure of Glass/ITO/LiNiO/electrolyte/ITO/Glass were fabricated, and the characteristics were investigated, such as, cyclic voltammetry (CV), transmittance spectra, optical density, coloring efficiency and etc. The ECD devices with the structure of Glass/ITO/LiNiO/electrolyte/ITO/Glass were fabricated, and the characteristics were investigated, such as, cyclic voltammetry (CV), transmittance spectra, optical density, coloring efficiency and etc. to obtain the optimized ECD devices
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