Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Effects of pH of Reaction Solution on the Structural and Optical Properties of CdS Thin Films for Solar Cell Applications

태양전지용 CdS 박막의 구조적 및 광학적 특성에 미치는 반응용액의 pH 영향

  • Lee, Jae-Hyeong (School of Information & Communication Engineering, Sungkyunkwan University)
  • 이재형 (성균관대학교 정보통신공학부)
  • Received : 2011.05.12
  • Accepted : 2011.07.24
  • Published : 2011.08.01
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Abstract

In this paper, CdS thin films, which were widely used window layer of the CdTe and the Cu(In,Ga)$Se_2$ thin film solar cell, were grown by chemical bath deposition, and effects of pH of reaction solution on the structural and optical properties were investigated. For pH<10.5, as the pH of reaction solution was higher, the deposition rate of CdS films was increased by improving ion-by-ion reaction in the substrate surface and the crystallinity of the films was improved. However, when the pH was higher than 10.5, the deposition rate was decreased because of smaller $Cd^{2+}$ ion concentration in the reaction solution. Also, the crystallinity of the films were deteriorated. The CdS films deposited at lower pH showed poor optical transmittance due to adsorbed colloidal particles, while the transmittance was improved for higher pH.

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References

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