Electrically and optically induced strain in single crystals of hybrid perovskites (methylammonium lead halides)
Abstract
Methylammonium lead halides (MAPbX3, X=Cl, Br, I) have been extensively studied in the last several years for their photovoltaic properties for solar cell applications. It was proposed that ferroelectricity and electrical polarization could play an important role in the large photovoltaic effect in this class of materials but there is no consensus whether these hybrid perosvkites possess a polar structure or ferroelectricity. In the meantime, the electromechanical and photostrictive effects in these materials were widely reported in studies using atomic force and piezoforce microscopy, which were limited to local observation on thin film MAPbI3. Therefore, there are a number of open issues in relation to electro-mechanical response and ferroelectricity that are of particular interest for Naval applications. In late 2018, the PI observed ferroelectric behavior and electromechanical strain in MAPbX3 single crystals. The giant strain (>1%) was an exciting discovery despite the observation was based on low frequency measurement (<<1 Hz). This proposed NICOP is a seed grant to clarify origins of the large and asymmetric electric field-induced displacement and photostriction. Moreover, the study will be based on macroscopic phenomenon utilizing mm size MAPbX3 crystals provided by the PI~s EPFL colleagues. The findings will lead to understanding of the material~s potential as a viable transducer materials. The implication can be tremendous, considering the broad design space these organic-inorganic hybrids offer.The PI has shown a clear understanding of the subject matter. His team~s past accomplishments clearly demonstrate the research team~s capabilities and facilities. The PI~s expertise and experience make him uniquely qualified to lead the project.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 15, 2019
- Source ID
- N629091912092
Entities
People
- Dragan Damjanović
Organizations
- Office of Naval Research
- United States Navy