采用直流反应磁控溅射方法在ITO导电玻璃上沉积了WO_3薄膜,研究了靶基距对其微结构和电致变色性能的影响,利用XRD、SEM和XPS对薄膜的微结构和成分进行了表征.通过可见光透射谱对样品的电致变色性能进行了研究,并且讨论了WO_3薄膜电致变色性能与其微结构、价态变化之间的关系.发现靶基距为7cm的情况下沉积得到的WO_3薄膜呈非晶态,薄膜有更多的孔隙,有利于Li~+的抽取,进而显示出较好的电致变色性能.反应溅射制备的WO_3薄膜中W是W~(6+)价态,颜色为透明状,当发生着色反应时,随着薄膜中Li~+成分增加,薄膜颜色变为蓝色,薄膜中W原子为W~(6+)和W~(5+)的混合价态.认为其电致变色的行为是由于Li~+和e~-在薄膜中的注入和拉出引起的W~(6+)和W~(5+)发生转化所致.
Tungsten oxide films were deposited on ITO coated glass substrates by reactive DC magnetron sputtering.The electrochromic (EC) properties of the films were studied with different target-substrates distance in the deposition process.The WO_3 films were characterized with X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM).The electrochromic properties and mechanism were discussed by means of spectrophotometry.It indicates that the samples are amorphous and have more pores that are beneficial for Li~+ to inject and eject from the film.The original-state films are composed of tungsten and oxygen,and tungsten ions are W~(6+).After electrochemical reactions,the main component becomes Li_xWO_3 in which tungsten ions normally exhibit both W~(6+) and W~(5+).The films exhibited cathodic electrochromism.The coloration and bleaching of the WO_3 film is associated with insertion and deinsertion of Li~+ ions and electrons in the films.
参考文献
| [1] | Granqvist CG. .Electrochromic tungsten oxide films: Review of progress 1993-1998 [Review][J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2000(3):201-262. |
| [2] | Dimitrova Z;Gogova D .[J].Materials Research Bulletin,2005,40:333-340. |
| [3] | Tacconi N R;Chenthamarakshan C R;Wouters K L .[J].Journal of Electroanalytical Chemistry,2004,566:249-256. |
| [4] | Ca(n)adas J G;Santiago F F;Porqueras I .[J].Solid State Ionics,2004,175:521-525. |
| [5] | 冯博学;谢亮;王军 等.[J].物理学报,2003,52(04):1003-1008. |
| [6] | Deb S K .[J].Philosophical Magazine,1973,27:801-822. |
| [7] | Faughnan B W;Crandall R S;Heyman P M et al.[J].RCA Review,1975,36:177-197. |
| [8] | Shirmer O F;Wittwer V et al.[J].Journal of the Electrochemical Society,1977,124:749-753. |
| [9] | Bechinger C .[J].Journal of the Electrochemical Society,1997,144:2022-2026. |
| [10] | 王力衡;黄运添;郑海涛.薄膜技术[M].北京:清华大学出版社,1991:53-57. |
| [11] | Larsson AL;Niklasson GA .Optical properties of electrochromic all-solid-state devices[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2004(1/4):351-360. |
| [12] | Yang H G;Wang C;Diao X G et al.[J].Journal of Physics D:Applied Physics,2008,41:115301. |
| [13] | Faughnan B W;Crandall R S;Heyman P M et al.[J].RCA Review,1975,36:177-197. |
| [14] | Wang XG.;Yang NH.;Yuan L.;Pang SJ.;Jang YS. .XPS and XRD study of the electrochromic mechanism of WOx films[J].Surface & Coatings Technology,1998(1/2):82-86. |
| [15] | Nanba T;Ishikawa M;Sakai Y et al.[J].Thin Solid Films,2003,445:175-181. |
| [16] | 陆家和.表面分析技术[M].北京:电子工业出版社,1987:314-320. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%