Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (12): 2821-2825.doi: 10.3866/PKU.WHXB20112821

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Preparation of Large Grain and Dense CdS Thin Films Using Ultrasonic Agitation Chemical Bath Deposition

SHI Cheng-Wu1,2, CHEN Zhu1,2, SHI Gao-Yang1,2, SUN Ren-Jie1   

  1. 1. School of Chemical Engineering, Hefei University of Technology, Hefei 230009, P. R. China;
    2. Key Laboratory of Novel Thin FilmSolar Cells, Chinese Academy of Sciences, Hefei 230031, P. R. China
  • Received:2011-07-14 Revised:2011-09-21 Published:2011-11-25
  • Contact: SHI Cheng-Wu
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51072043), National Key Basic Research Program of China (973) (2011CBA00700), Anhui Province Science and Technology Plan Project of China (2010AKND0794), College Natural Science Foundation of Anhui Province, China (KJ2010A266), and Undergraduate Innovation Fund of Hefei University of Technology, China (cxsy102084).

Abstract: We deposited CdS thin films onto F-doped SnO2 transparent conductive glass by ultrasonic agitation chemical bath deposition (UCBD). The influence of the annealing and CdCl2-treatment on the surface morphology, crystal structure, and direct band gap of the UCBD-CdS thin films was investigated. The effect of deposition time on the grain size of the CdS aggregates and the stack denseness of the UCBD-CdS thin films was compared. The results reveal that the small grains in the CdS aggregates were melted together and the CdS aggregate size did not change in the UCBD-CdS thin films after the CdCl2-treatment procedure. It is interesting that the ratio of the horizontal to vertical deposition rate varied with deposition time over the deposition period of the UCBD-CdS thin films. The deposition time was very important to obtain large CdS aggregate grains and dense UCBD-CdS thin films. Over a deposition time of 40 min the resulting UCBD-CdS thin films were dense and had a 180 nm grain size of CdS aggregates and a 80.8 nm of thin film thickness. The large-grained and dense UCBD-CdS thin films were suitable for thin film solar cells as a window layer.

Key words: CdS thin film, Ultrasonic agitation, Chemical bath deposition, Deposition time, Annealing, CdCl2-treatment