Effects of back surface textures on contact formation and solar cell performance

Hsin Chiao Fang, Che Chia Chang, Chuan-Pu Liu, Hung Shuo Chung, Chin Lin Huang

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Al screen-printed Si solar cells are fabricated with various ramp-up rates during cofiring, and the impact of the textured back surface on the alloying process in relation to solar cell performance is investigated. Scanning electron microscopy and transmission electron microscopy analyses show that slow ramp-up rates of 20 and 40°C/s would cause a nonuniform back surface field and the presence of Si-rich extrusions at the Al-Si alloy/Si interface with faceting along {111} planes of Si, which results in a lower Voc. The formation mechanism of the Si-rich extrusions is proposed to be related to the packing of nonuniform Al powder size distribution in the paste, and the degradation of the back contact formation by the textures could be avoided by optimizing the ramp-up rate.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume157
Issue number3
DOIs
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Electrochemistry

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