Structure-Photophysics-Function Relationship of Perovskite Materials
Abstract
Optoelectronic devices such as solar cells comprising organometal halide that adopt perovskitestructure have become much more efficient. These stem from the optoelectronic properties suchas weak exciton binding energy and limited electron-hole recombination. Perovskite crystalstructure is sensitive to subtle variance during the film formation, which plays a critical role inphotophysics. Although it is agreed that crystalline film results in limited electron-holerecombination, the scientific community has not had a clear understanding of howmicrostructures affect exciton and free carrier dynamics macroscopically, and a priori predictionof photophysics and novel properties based on structure is not yet possible. Therefore, wepropose to study the structure-photophysics-function relationship for organic-inorganic hybridperovskite materials. The unique aspect of this proposal is to build an intermediate photophysicsbridge to better connect structure and emerging optoelectronic properties with the goal ofunderstanding the structure-function relationship.In order to modify the microstructure, we will focus on the following four key methods: processing condition, molecular engineering, polymer scaffold, and external stimuli. We have utilized femtosecond laser transient absorption spectroscopy to observe that the microstructure variation, such as the orientational distribution of the organic cation at different phases, can significantly affect exciton relaxation and electron-hole recombination. This motivates us to better understand exciton, free carrier, and phonon dynamics based on different microstructures. Such a study can shed light not only on solar cell application but also on light-emitting diode, novel polarization and thermal properties.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 02, 2017
- Source ID
- FA95501710099
Entities
People
- He Wang
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Miami