Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (9): 1758-1763.doi: 10.3866/PKU.WHXB201406301

• PHOTOCHEMISTRY AND RADIATION CHEMISTRY • Previous Articles     Next Articles

Influence of Different Pyramidal Structural Morphologies of Crystalline Silicon Wafers for Surface Passivation and Heterojunction Solar Cells

WANG Li-Guo1,2, ZHANG Xiao-Dan2, WANG Feng-You2, WANG Ning1,2, JIANG Yuan-Jian2, HAO Qiu-Yan1, XU Sheng-Zhi2, WEI Chang-Chun2, ZHAO Ying2   

  1. 1. Institute of Information Functional Materials, Hebei University of Technology, Tianjin 300130, P. R. China;
    2. Key Laboratory of Photo-Electronics Thin Film Devices and Technique of Tianjin, Key Laboratory of Photo-Electronic Information Science and Technology of Ministry of Education, Institute of Photo-Electronics Thin Film Devices and Technique, Nankai University, Tianjin 300071, P. R. China
  • Received:2014-06-04 Revised:2014-06-30 Published:2014-08-29
  • Contact: ZHANG Xiao-Dan E-mail:xdzhang@nankai.edu.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2011CBA00706, 2011CBA00707), Major Science and Technology Support Project of Tianjin, China (11TXSYGX22100), and Specialized Research Fund for the Doctoral Program of Higher Education, China (20120031110039).

Abstract:

Silicon heterojunction (SHJ) solar cells consisting of a hydrogenated amorphous silicon (a-Si:H) film deposited on a crystalline silicon wafer have attracted considerable attention from the photovoltaic industry, because of their high efficiencies, high stabilities, low cost, and low-temperature fabrication. Texturing of silicon surfaces is an effective method for improving the efficiency of silicon solar cells. In this work, textured silicon substrates consisting of three different pyramidal structures were obtained using tetramethylammonium hydroxide (TMAH) solution, and used to fabricate SHJ solar cells. We investigated the influence of different pyramidal structural morphologies on the optical properties and electronic performances, to identify the optimum structure for SHJ solar cells. We obtained a standard silicon substrate with four-sided pyramidal structures using 2% (w) TMAH and 10% (w) isopropyl alcohol (IPA). In comparison with other pyramidal structures, the standard four-sided pyramidal-structured silicon substrate had the lowest reflectance, leading to an increased short-circuit current density (Jsc), and its morphology is suitable for surface passivation and SHJ solar cells.

Key words: Texturing, Surface morphology of pyramids, Reflectance, Effective carrier lifetime, Passivation, Heterojunction solar cell

MSC2000: 

  • O649