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Title: Nanoscale excitonic photovoltaic mechanism in ferroelectric BiFeO 3 thin films [Nanoscale excitonic mechanism underlying the bulk photovoltaic effect in ferroelectric BiFeO 3 thin films]

Abstract

We report an electrode-free photovoltaic experiment in epitaxial BiFeO 3 thin films where the picosecond optical absorption arising from carrier dynamics and piezoelectric lattice distortion due to the photovoltaic field are correlated at nanoscale. The data strongly suggest that the photovoltaic effect in phase-pure BiFeO 3 originates from diffusion of charge-neutral excitons and their subsequent dissociation localized at sample interfaces. This is in stark contrast to the belief that carrier separation is uniform within the sample due to the lack of center of symmetry in BiFeO 3. As a result, this finding is important for formulating strategies in designing practical photovoltaic ferroelectric devices.

Authors:
 [1];  [2];  [3];  [1];  [4];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Stanford Univ., Stanford, CA (United States)
  3. Northwestern Univ., Evanston, IL (United States)
  4. Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY (United States); Cornell Univ., Ithaca, NY (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
U.S. Army Research Laboratory, U.S. Army Research Office (ARO); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21). Scientific Discovery through Advanced Computing (SciDAC)
OSTI Identifier:
1473616
Alternate Identifier(s):
OSTI ID: 1441076
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 6; Journal Issue: 8; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; exciton; ferroelectric; photovoltaic

Citation Formats

Li, Yuelin, Adamo, Carolina, Rowland, Clare E., Schaller, Richard D., Schlom, Darrell G., and Walko, Donald A. Nanoscale excitonic photovoltaic mechanism in ferroelectric BiFeO3 thin films [Nanoscale excitonic mechanism underlying the bulk photovoltaic effect in ferroelectric BiFeO3 thin films]. United States: N. p., 2018. Web. doi:10.1063/1.5030628.
Li, Yuelin, Adamo, Carolina, Rowland, Clare E., Schaller, Richard D., Schlom, Darrell G., & Walko, Donald A. Nanoscale excitonic photovoltaic mechanism in ferroelectric BiFeO3 thin films [Nanoscale excitonic mechanism underlying the bulk photovoltaic effect in ferroelectric BiFeO3 thin films]. United States. doi:10.1063/1.5030628.
Li, Yuelin, Adamo, Carolina, Rowland, Clare E., Schaller, Richard D., Schlom, Darrell G., and Walko, Donald A. Fri . "Nanoscale excitonic photovoltaic mechanism in ferroelectric BiFeO3 thin films [Nanoscale excitonic mechanism underlying the bulk photovoltaic effect in ferroelectric BiFeO3 thin films]". United States. doi:10.1063/1.5030628. https://www.osti.gov/servlets/purl/1473616.
@article{osti_1473616,
title = {Nanoscale excitonic photovoltaic mechanism in ferroelectric BiFeO3 thin films [Nanoscale excitonic mechanism underlying the bulk photovoltaic effect in ferroelectric BiFeO3 thin films]},
author = {Li, Yuelin and Adamo, Carolina and Rowland, Clare E. and Schaller, Richard D. and Schlom, Darrell G. and Walko, Donald A.},
abstractNote = {We report an electrode-free photovoltaic experiment in epitaxial BiFeO3 thin films where the picosecond optical absorption arising from carrier dynamics and piezoelectric lattice distortion due to the photovoltaic field are correlated at nanoscale. The data strongly suggest that the photovoltaic effect in phase-pure BiFeO3 originates from diffusion of charge-neutral excitons and their subsequent dissociation localized at sample interfaces. This is in stark contrast to the belief that carrier separation is uniform within the sample due to the lack of center of symmetry in BiFeO3. As a result, this finding is important for formulating strategies in designing practical photovoltaic ferroelectric devices.},
doi = {10.1063/1.5030628},
journal = {APL Materials},
number = 8,
volume = 6,
place = {United States},
year = {2018},
month = {6}
}

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