Real‐Time Observation of Order‐Disorder Transformation of Organic Cations Induced Phase Transition and Anomalous Photoluminescence in Hybrid Perovskites
Abstract
A fundamental understanding of the interplay between the microscopic structure and macroscopic optoelectronic properties of organic‐inorganic hybrid perovskite materials is essential to design new materials and improve device performance. However, how exactly the organic cations affect the structural phase transition and optoelectronic properties of the materials is not well understood. Here, real‐time, in situ temperature‐dependent neutron/X‐ray diffraction and photoluminescence (PL) measurements reveal a transformation of the organic cation CH3NH3 + from order to disorder with increasing temperature in CH3NH3PbBr3 perovskites. The molecular‐level order‐to‐disorder transformation of CH3NH3 + not only leads to an anomalous increase in PL intensity, but also results in a multidomain to single‐domain structural transition. This discovery establishes the important role that organic cation ordering has in dictating structural order and anomalous optoelectronic phenomenon in hybrid perovskites.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 16, 2018
- Source ID
- 10.1002/adma.201705801
Entities
People
- Alexander A Puretzky
- Bin Yang
- Christopher M. Rouleau
- David B Geohegan
- Jinsong Huang
- Jong K Keum
- Kai Xiao
- Mao‐hua Du
- Wenmei Ming
- Xiao-Ping Wang
Organizations
- Defense Threat Reduction Agency
- Hunan University
- Oak Ridge National Laboratory
- United States Department of Energy
- University of Nebraska–Lincoln