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Journal article
Direct observation of shift and ballistic photovoltaic currents
Science advances, v 5(1), pp eaau5588-eaau5588
04 Jan 2019
PMID: 30746451
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Shift and ballistic photovoltaic currents, previously indistinguishable experimentally, can now be separated.
The quantum phenomenon of shift photovoltaic current was predicted decades ago, but this effect was never observed directly because shift and ballistic currents coexist. The atomic-scale relaxation time of shift, along with the absence of a photo-Hall behavior, has made decisive measurement of shift elusive. Here, we report a facile, direct-current, steady-state method for unambiguous determination of shift by means of the simultaneous measurements of linear and circular bulk photovoltaic currents under magnetic field, in a sillenite piezoelectric crystal. Comparison with theoretical predictions permits estimation of the signature length scale for shift. Remarkably, shift and ballistic photovoltaic currents under monochromatic illumination simultaneously flow in opposite directions. Disentangling the shift and ballistic contributions opens the way for quantitative, fundamental insight into and practical understanding of these radically different photovoltaic current mechanisms and their relationship.
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Details
- Title
- Direct observation of shift and ballistic photovoltaic currents
- Creators
- Aaron M. Burger - Drexel UniversityRadhe Agarwal - Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USAAlexey Aprelev - Drexel UniversityEdward Schruba - Drexel UniversityAlejandro Gutierrez-Perez - Drexel UniversityVladimir M. Fridkin - Drexel UniversityJonathan E. Spanier - Drexel University
- Publication Details
- Science advances, v 5(1), pp eaau5588-eaau5588
- Publisher
- American Association for the Advancement of Science (AAAS)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics; Mechanical Engineering and Mechanics; College of Engineering
- Web of Science ID
- WOS:000457547900038
- Scopus ID
- 2-s2.0-85060024481
- Other Identifier
- 991019169141404721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Applied