Investigation of sub-stoichiometric MoOx hole-selective contacts for rear junction passivating contact silicon solar cells

Dongkyun Kang, Hae Seok Lee, Donghwan Kim, Yoonmook Kang

Research output: Contribution to journalArticlepeer-review

Abstract

Carrier-selective contacts play a crucial role in improving the performance of silicon solar cells by reducing recombination losses. This study explores the use of sub-stoichiometric molybdenum oxide (MoOx) as a hole-selective contact material deposited via thermal evaporation. X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) analysis reveal diverse Mo–O bonding configurations and a low work function of ∼5.02 eV for the MoOx film. The passivation properties of a cell-like structure with local MoOx contact are found to be comparable to those of a structure with a full front passivation layer, as evidenced by an implied open-circuit voltage (iVoc) of 703.2 mV. However, the conversion efficiency of the solar cell with MoOx contact is limited to 16.5 %, with reduced external quantum efficiency (EQE) at UV and visible wavelengths. The study proposes that optimizing the MoOx front contact's work function and passivation characteristics could improve the solar cell's efficiency to 21.8 %. This research demonstrates the potential of sub-stoichiometric MoOx as a promising hole-selective contact for silicon solar cells, highlighting the factors influencing its performance.

Original languageEnglish
Article number100647
JournalJournal of Science: Advanced Materials and Devices
Volume9
Issue number1
DOIs
Publication statusPublished - 2024 Mar

Bibliographical note

Publisher Copyright:
© 2023 Vietnam National University, Hanoi

Keywords

  • Hole-Selective contact
  • Molybdenum oxide (MoO)
  • Thermal evaporation
  • Work function

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Biomaterials
  • Materials Science (miscellaneous)

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