Manipulating Crystallization of Organolead Mixed-Halide Thin Films in Antisolvent Baths for Wide-Bandgap Perovskite Solar Cells

Mengjin Yang, Kai Zhu, Yuanyuan Zhou, Onkar Game, Wenwen Wu, Joonsuh Kwun, Martin Strauss, Yanfa Yan, Jinsong Huang, Nitin Padture

Research output: Contribution to journalArticlepeer-review

91 Scopus Citations

Abstract

Wide-bandgap perovskite solar cells (PSCs) based on organolead (I, Br)-mixed halide perovskites (e.g., MAPbI2Br and MAPbIBr2 perovskite with bandgaps of 1.77 and 2.05 eV, respectively) are considered as promising low-cost alternatives for application in tandem or multijunction photovoltaics (PVs). Here, we demonstrate that manipulating the crystallization behavior of (I, Br)-mixed halide perovskites in antisolvent bath is critical for the formation of smooth, dense thin films of these perovskites. Since the growth of perovskite grains from a precursor solution tends to be more rapid with increasing Br content, further enhancement in the nucleation rate becomes necessary for the effective decoupling of the nucleation and the crystal-growth stages in Br-rich perovskites. This is enabled by introducing simple stirring during antisolvent-bathing, which induces enhanced advection transport of the extracted precursor-solvent into the bath environment. Consequently, wide-bandgap planar PSCs fabricated using these high quality mixed-halide perovskite thin films, Br-rich MAPbIBr2, in particular, show enhanced PV performance.

Original languageAmerican English
Pages (from-to)2232-2237
Number of pages6
JournalACS Applied Materials and Interfaces
Volume8
Issue number3
DOIs
StatePublished - 27 Jan 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-65869

Keywords

  • antisolvent-solvent extraction
  • grain growth
  • nucleation
  • solar cells
  • wide-bandgap perovskite

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