Digital Alloy Contact Layers for Perovskite Solar Cells

Olivia Sergiovanni, Ekraj Dahal, Bin Du, Benjamin Isenhart, Sean Dunfield, Joseph J. Berry, Matthew S. White

Research output: Contribution to journalArticlepeer-review


Thin film optoelectronic devices commonly require an individual material to perform multiple functions, but the physical properties of single-composition materials often cannot be tuned to optimize these diverse requirements. The electron selective contact layer in perovskite solar cells is a prime example. The material must simultaneously have optimal conduction band alignment, facilitate carrier extraction, prevent recombination, and provide a chemically stable interface with the notoriously volatile perovskite semiconductor. The pulse-by-pulse nature of the thin-film deposition method pulsed laser deposition (PLD) provides an opportunity to form material alloys where the chemical composition is controlled at the nanometer scale. These digital alloys may prove to be a powerful materials class to meet some of the multifunctional needs of thin film devices. Using PLD to make electron transport layers from ZnO and MgZnO targets, we demonstrate that digital alloy gradients can be tuned to significantly outperform either of the parent materials in perovskite solar cells.

Original languageAmerican English
Article number116412
Number of pages6
JournalSynthetic Metals
StatePublished - Aug 2020

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5K00-77265


  • Digital alloy
  • Electron transport layer
  • Perovskite
  • Solar cell


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