Effective Hole Extraction using MoOx-Al Contact in Perovskite CH3NH3PbI3 Solar Cells

Yixin Zhao, Alexandre M. Nardes, Kai Zhu

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Abstract

We report an 11.4%-efficient perovskite CH3NH 3PbI3 solar cell using low-cost molybdenum oxide/aluminum (i.e., MoOx/Al) as an alternative top contact to replace noble/precious metals (e.g., Au or Ag) for extracting photogenerated holes. The device performance of perovskite solar cells using a MoOx/Al top contact is comparable to that of cells using the standard Ag top contact. Analysis of impedance spectroscopy measurements suggests that using 10-nm-thick MoOx and Al does not affect charge-recombination properties of perovskite solar cells. Using a thicker (20-nm) MoOx layer leads to a lower cell performance caused mainly by a reduced fill factor. Our results suggest that MoOx/Al is promising as a low-cost and effective hole-extraction contact for perovskite solar cells.

Original languageAmerican English
Article numberArticle No. 213906
Number of pages4
JournalApplied Physics Letters
Volume104
Issue number21
DOIs
StatePublished - 26 May 2014

NREL Publication Number

  • NREL/JA-5900-61735

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