Direct observation of intrinsic twin domains in tetragonal CH3NH3PbI3
Open Access
- 23 February 2017
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 8 (1), 14547
- https://doi.org/10.1038/ncomms14547
Abstract
Organic–inorganic hybrid perovskites are exciting candidates for next-generation solar cells, with CH3NH3PbI3 being one of the most widely studied. While there have been intense efforts to fabricate and optimize photovoltaic devices using CH3NH3PbI3, critical questions remain regarding the crystal structure that governs its unique properties of the hybrid perovskite material. Here we report unambiguous evidence for crystallographic twin domains in tetragonal CH3NH3PbI3, observed using low-dose transmission electron microscopy and selected area electron diffraction. The domains are around 100–300 nm wide, which disappear/reappear above/below the tetragonal-to-cubic phase transition temperature (approximate 57 °C) in a reversible process that often ‘memorizes’ the scale and orientation of the domains. Since these domains exist within the operational temperature range of solar cells, and have dimensions comparable to the thickness of typical CH3NH3PbI3 films in the solar cells, understanding the twin geometry and orientation is essential for further improving perovskite solar cells.This publication has 40 references indexed in Scilit:
- Twin-induced one-dimensional homojunctions yield high quantum efficiency for solar hydrogen generationNature Communications, 2013
- Ferroelastic MaterialsAnnual Review of Materials Research, 2012
- Analysis of the Phase Transition and the Domain Structure in K0.5Bi0.5TiO3 Perovskite Ceramics by In Situ XRD and TEMJournal of the American Ceramic Society, 2010
- Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic CellsJournal of the American Chemical Society, 2009
- Transformation‐Induced Twinning: The 90° and 180° Ferroelectric Domains in Tetragonal Barium TitanateJournal of the American Ceramic Society, 2006
- Ferroelastic phase transitions: structure and microstructureActa Crystallographica Section A Foundations of Crystallography, 2004
- Mesoscopic structures in ferroelastic crystals: needle twins and right-angled domainsJournal of Physics: Condensed Matter, 1996
- Transformation-induced twin boundaries in mineralsPhase Transitions, 1994
- Calorimetric and IR spectroscopic studies of phase transitions in methylammonium trihalogenoplumbates (II)†Journal of Physics and Chemistry of Solids, 1990
- Identification of rotation and reflection twin by diffraction and contrast experiments in the electron microscopephysica status solidi (a), 1976