Multi-crystalline silicon solar cells with metal-assisted nano-texturing using HNO3 as hole injection agent


Es F. , Baytemir G., Kulakci M., Turan R.

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS, vol.10, pp.866-869, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 10
  • Publication Date: 2016
  • Doi Number: 10.1002/pssr.201600245
  • Title of Journal : PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
  • Page Numbers: pp.866-869
  • Keywords: metal-assisted etching, textures, black silicon, solar cells, photovoltaics, multicrystalline materials, WAFERS

Abstract

In this study, metal-assisted etching (MAE) with nitric acid (HNO3) as a hole injecting agent has been employed to texture multi-crystalline silicon wafers. It was previously proven that addition of HNO3 enabled control of surface texturing so as to form nano-cone shaped structures rather than nanowires. The process parameters optimized for optically efficient texturing have been applied to multi-crystalline wafers. Fabrication of p-type Al: BSF cells have been carried out on textured samples with thermal SiO2/PECVD-SiNx stack passivation and screen printed metallization. Firing process has been optimized in order to obtain the best contact formation. Finally, j(sc) enhancement of 0.9 mA/cm(2) and 0.6% absolute increase in the efficiency have been achieved. This proves that the optimized MAE texture process can be successfully used in multi-crystalline wafer texturing with standard passivation methods. J-V curves and SEM images of the nano and iso-textured samples. j(sc) enhancement of 0.9 mA/cm(2) together with 0.6% absolute efficiency gain was observed on nano-textured samples. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim