偏压对ITO薄膜生长模式和光电性能的影响

为明确溅射偏压对ITO薄膜性质的影响,用射频磁控溅射法于室温在玻璃衬底制备出ITO透明导电薄膜,研究了不同偏压下ITO薄膜的生长模式、光学和电学性能.结果表明:随着偏压的增加,薄膜沉积模式经历了沉积、沉积和扩散、表面脱附3种方式;AFM和SEM显示,偏压为100 V时,膜层表面光洁、均匀,粗糙度最小,均方根粗糙度为1.61 nm;XRD分析表明偏压会影响与薄膜的择优取向,偏压为100 V时,薄膜晶粒取向为(222)面;薄膜偏压为120 V时,薄膜的光电性能最佳,电阻率最低为2.59×10-4Ω.cm,可见光区的平均透过率在85%以上;偏压的大小使薄膜的吸收边发生了"蓝移"或"红移".

Effects of sputtering bias-voltage on ITO thin films growth modes and photoelectric properties

To clarify the effect of sputtering bias-voltage on the photoelectric properties of indium tin oxide(ITO) thin films,the ITO thin films were deposited by RF magnetron sputtering on glass substrates at room temperature and the growth modes,electrical and optical properties of these films were investigated as a function of the sputtering bias-voltage.The results show that,with the increasing of sputtering bias-voltage,the films deposition undergoes three modes "deposition","diffusion" and "desorption".AFM and SEM investigations reveal that the films have very smooth and uniform surface with a smallest root mean square roughness of 1.61 nm at 100 V sputtering bias-voltage.XRD results show the deposited films demonstrate a preferred orientation of(222) with a similar crystal structure at 100 V sputtering bias-voltage.The films with the sputtering bias-voltage of 120 V in this study show that the lowest resistivity of 2.59×10-4 Ω·cm and the optical transmittance in visible range of the films is over 85 %."Blue shift" or "red shift" of the absorption edge can be observed with different bias-voltages.