Journal article
Distinguishing Thermal and Electronic Effects in Ultrafast Optical Spectroscopy Using Oxide Heterostructures
Journal of physical chemistry. C, v 122(1)
11 Jan 2018
Abstract
Measuring time-resolved photoexcited properties in semiconductors is critical to the design and improvement of light-harvesting devices. Although ultrafast pump probe spectroscopy offers a promising route to understand carrier recombination mechanisms and quantify, lifetimes, thermal contributions to the transient optical response can be significant and need to be properly accounted for to isolate carrier-induced contributions. We demonstrate the use of broadband ultrafast optical spectroscopy on type heterostructures as a means to isolate-transient effects that are solely thermal in nature. Specifically, we use transient absorption,and reflectance spectroscopy to measure the time-resolved optoelectronic changes in photoexcited epitaxial bilayers of LaFeO3/LaMnO3 and monolithic thin film's of these materials:, Experiments and complementary numerical modeling reveal that thermal effects dominate the transient absorption-and reflectance spectra above the band gap. Fitting the dynamics with a thermal diffusion model yields thermal conductivities of 6.4 W m(-1) k(-1) for LaFeO3 and 2.2 W m(-1) k(-1) for LaMnO3. In LaFeO3, an additional photoinduced absorption feature below the band gap at X1.9 eV is assigned primarily to photoexcited carriers and persists for over 3 ns. This work provides a direct demonstration of how thermal and electronic contributions can be separated in transient optical spectroscopies, enabling new insights into dynamical optical properties of semiconductors.
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Details
- Title
- Distinguishing Thermal and Electronic Effects in Ultrafast Optical Spectroscopy Using Oxide Heterostructures
- Creators
- Sergey Y. Smolin - Drexel UniversityAmber K. Choquette - Drexel UniversityJiayi Wang - Drexel UniversitySteven J. May - Drexel UniversityJason B. Baxter - Drexel University
- Publication Details
- Journal of physical chemistry. C, v 122(1)
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 9
- Grant note
- DE-ACO2-98CH10886 / U.S. Department of Energy, Office of Basic Energy Sciences; United States Department of Energy (DOE) ECCS-1201957; DMR-1507988 / National Science Foundation; National Science Foundation (NSF) DMR-0922929 / NSF MRI Award; National Science Foundation (NSF); NSF - Office of the Director (OD) 1507988 / Division Of Materials Research; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; Chemical and Biological Engineering
- Web of Science ID
- WOS:000422814200012
- Scopus ID
- 2-s2.0-85040516865
- Other Identifier
- 991019167652504721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology