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Theoretical analysis and experimental study of optical loss of metal contacts of crystalline silicon solar cells

Song Yang Gao Zhi-Hua Duan Ye Li You-Zhong Yang Hai-Feng Li Tao Zhou Chun-Lan Liu Zhen-Gang Wang Wen-Jing

Theoretical analysis and experimental study of optical loss of metal contacts of crystalline silicon solar cells

Song Yang, Gao Zhi-Hua, Duan Ye, Li You-Zhong, Yang Hai-Feng, Li Tao, Zhou Chun-Lan, Liu Zhen-Gang, Wang Wen-Jing
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  • Received Date:  04 November 2010
  • Accepted Date:  15 December 2010
  • Published Online:  15 September 2011

Theoretical analysis and experimental study of optical loss of metal contacts of crystalline silicon solar cells

  • 1. (1)Chinalight Solar Co. Ltd., Beijing 101111, China; (2)Chinese Academy of Inspection and Quarantine, Beijing 100123, China; (3)The Key Laboratory of Solar Thermal Energy and Photovoltaic System, Institute of Electrical Engineering, CAS, Beijing 100190, China

Abstract: One main factor of restricting industrial crystalline solar cell efficiency is the optical losses caused by the metal front side contacts, including the absorption loss and reflection loss. Based on screen-printed and screen-printed seed layers thickened by light-induced electroplating solar cells, in this paper various cases of optical losses due to the metal contacts are analyzed. Taking into account the reflections in the air-glass interface and the edge regions of metal contacts, the optical losses are simulated by assuming approximately half-oval cross-section of metal contacts. The results show that the effective width ratio is about 40% of the metal contact geometry width. By measuring and calculating the reflection spectra of different types of samples, the optical losses of the metal front side contacts of solar cells are obtained in theoretical simulation and experimental measurement. The corresponding theory and the experimental results are in good agreement with each other.

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