Effective Contact Formation Method on High-Sheet-Resistance Boron-Doped Emitter with Current Injection

Soohyun Bae, Jae Wook Choi, Chanseok Kim, Seung Hyun Shin, Hyunjung Park, Yoonmook Kang, Hae Seok Lee, Donghwan Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We investigate the effect of current injection during contact formation of an Ag-based screen-printed electrode to boron-doped emitters, which differ by their sheet resistances. The average contact resistivities between the metal electrode and silicon of all the boron-doped emitter samples are ∼3 mω cm2, regardless of the sheet resistance (75-145 Ω/sq), and the lowest values are below 1 mω cm2 using the injection of a current density of 5 A/cm2 during the metallization process. Additionally, the injection of current to a phosphorus-doped emitter in the opposite direction suppressed the formation of the Ag precipitates and crystallites and increased the contact resistivity of over 300 mω cm2, which is comparable to that obtained when Ag paste is applied to a boron-doped emitter with no current injection. This finding indicates that electrons are essential for the reduction of Ag ions during high-temperature metallization process using the screen-printing technique and that the injection of current can control the contact formation and enhance the efficiency of solar cells. Finally, we suggest a suitable process for reducing the contact resistivity in manufacturing n-type Si solar cells.

Original languageEnglish
Article number8643984
Pages (from-to)615-620
Number of pages6
JournalIEEE Journal of Photovoltaics
Volume9
Issue number3
DOIs
Publication statusPublished - 2019 May

Keywords

  • Boron-doped emitter
  • crystalline Si solar cells
  • current injection
  • metallization
  • screen printing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Effective Contact Formation Method on High-Sheet-Resistance Boron-Doped Emitter with Current Injection'. Together they form a unique fingerprint.

Cite this