SURF: Announcements of Opportunity
Below are Announcements of Opportunity posted by Caltech faculty and JPL technical staff for the SURF program. Additional AOs for the Amgen Scholars program can be found here.
Specific GROWTH projects being offerred for summer 2019 can be found here.
Each AO indicates whether or not it is open to non-Caltech students. If an AO is NOT open to non-Caltech students, please DO NOT contact the mentor.
Announcements of Opportunity are posted as they are received. Please check back regularly for new AO submissions! Remember: This is just one way that you can go about identifying a suitable project and/or mentor.
Announcements for external summer programs are listed here.
Students pursuing opportunities at JPL must be
U.S. citizens or U.S. permanent residents.
|Project:||Defects in Metal-Halide Perovskites|
Distingusished staff scientist, (PMA),
|Mentor URL:||http://www-ssrl.slac.stanford.edu/toneygroup (opens in new window)|
|Background:||NOTE: Two of the distinguishing properties of Metal-Halide Perovskites that sets them apart from conventional semiconductors is the dynamical disorder present in the lattice and the propensity to form defects, largely halide vacancies. These phenomena have tremendous impact of the HPSC performance as the lattice dynamics is important in the cooling and transport of photoexcited charges (i.e., electron-phonon coupling) and point defects facilitate ion motion, which strongly impacts instability.|
|Description:||The position involves quantifying the defect nature as a function of perovskite composition and formation process. This includes micro phase separation – at what length scale does an alloy become inhomogeneous – as this impacts performance and stability. Compositional fluctuations can lead to nucleation sites for photo-induced compositional instabilities. The absolute halide vacancy concentration and its dependence on processing can be determined with a novel analysis methodology.|
Some of our recent papers:
|Student Requirements:||Condensed matter physics, X-ray diffraction|
This AO can be done under the following programs:
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