Enhancing the Optoelectronic Performance of Perovskite Solar Cells via a Textured CH3NH3PbI3 Morphology

Alexander R. Pascoe, Steffen Meyer, Wenchao Huang, Wei Li, Iacopo Benesperi, Noel W. Duffy, Leone Spiccia, Udo Bach, Yi-Bing Cheng

Research output: Contribution to journalArticleResearchpeer-review

63 Citations (Scopus)

Abstract

Perovskite-based solar cells are generally assembled as planar structures comprising a flat organoammonium metal halide perovskite layer, or mesoscopic structures employing a mesoporous metal-oxide scaffold into which the perovskite material is infiltrated. To present, little attention has been directed toward the texturing of the perovskite material itself. Herein, a textured CH3NH3PbI3 morphology formed through a thin mesoporous TiO2 seeding layer and a gas-assisted crystallization method is reported. The textured morphology comprises a multitiered nanostructure, which allows for significant improvements in the light harvesting and charge extraction performance of the solar cells. Due to these improvements, average short-circuit current densities for a batch of 28 devices are in excess of 22 mA cm-2, and the maximum recorded power conversion efficiency is 16.3%. The performance gains concomitant with this textured CH3NH3PbI3 morphology provide further insights into how control of the perovskite microstructure can be used to enhance the cell performance. A textured CH3NH3PbI3 morphology for perovskite-based solar cells is presented. The textured morphology exhibits enhanced light harvesting and charge separation properties. The highest measured power conversion efficiency is 16.3%.

Original languageEnglish
Pages (from-to)1278-1285
Number of pages8
JournalAdvanced Functional Materials
Volume26
Issue number8
DOIs
Publication statusPublished - 23 Feb 2016

Keywords

  • gas-assisted crystallization method
  • perovskite solar cell
  • textured morphology

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