Structural and thermodynamic limits of layer thickness in 2D halide perovskites
Abstract
Organic–inorganic hybrid perovskites are exciting new solar cell materials. In 2D perovskites, the 3D structure is spatially interrupted by a layer of intercalated ions, which may alter both stability and functionality. A major question concerns the limit to which the 2D architecture can be maintained as the thickness of the layers increases. A combination of synthetic chemistry, crystallography, and spectroscopy was used to obtain and identify the thickest 2D halide perovskite characterized to date, having seven layers. Experimentally measured enthalpies of formation as a function of layer thickness show systematic behavior and that higher homologues are energetically unstable, placing a limit on the number of layers possible in a single-phase 2D perovskite. Their application in photovoltaics is discussed.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 18, 2018
- Source ID
- 10.1073/pnas.1811006115
Entities
People
- Aditya D Mohite
- Alexandra Navrotsky
- Boubacar Traore
- Chan Myae Myae Soe
- Claudine Katan
- Constantinos C. Stoumpos
- Duyen H. Cao
- Ferdinand S Melkonyan
- G. P. Nagabhushana
- Hsinhan Tsai
- Jacky Even
- Jean-Christophe Blancon
- Laurent Pedesseau
- Mercouri Kanatzidis
- Mikaël Kepenekian
- Radha Shivaramaiah
- Tobin J. Marks
- Wanyi Nie
Organizations
- Northwestern University
- Office of Naval Research
- United States Department of Energy
- University of California