Efficient Planar Perovskite Solar Cells Based on 1.8 eV Band Gap CH3NH3PbI2Br Nanosheets via Thermal Decomposition

Yixin Zhao, Kai Zhu

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229 Scopus Citations

Abstract

Hybrid organometallic halide perovskite CH3NH 3PbI2Br (or MAPbI2Br) nanosheets with a 1.8 eV band gap were prepared via a thermal decomposition process from a precursor containing PbI2, MABr, and MACl. The planar solar cell based on the compact layer of MAPbI2Br nanosheets exhibited 10% efficiency and a single-wavelength conversion efficiency of up to 86%. The crystal phase, optical absorption, film morphology, and thermogravimetric analysis studies indicate that the thermal decomposition process strongly depends on the composition of precursors. We find that MACl functions as a glue or soft template to control the initial formation of a solid solution with the main MAPbI2Br precursor components (i.e., PbI2 and MABr). The subsequent thermal decomposition process controls the morphology/surface coverage of perovskite films on the planar substrate and strongly affects the device characteristics.

Original languageAmerican English
Pages (from-to)12241-12244
Number of pages4
JournalJournal of the American Chemical Society
Volume136
Issue number35
DOIs
StatePublished - 3 Sep 2014

NREL Publication Number

  • NREL/JA-5900-62340

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