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Title: Ultrafast Probes at the Interfaces of Solar Energy Conversion Materials

Abstract

Ultrafast carrier dynamics at interfaces plays a major role in governing solar energy conversion efficiency in solar conversion systems, especially in solar cells and photoelectrochemical devices. In this perspective, we discuss recent advances in ultrafast spectroscopic probes to understand the dynamics at such interfaces. Transient reflectance (TR) enables monitoring of the surface carriers that are within ~10 nm of the surface or interface of interest. Crucial parameters such as surface recombination velocity and carrier diffusion can be determined. When a strong surface or interfacial field is present the reflectance spectrum will exhibit Franz-Kelydesh oscillations. Monitoring the transient formation or decay of such oscillations informs about the interfacial field and is referred to as transient photoreflectance (TPR). Such fields are helpful in designing systems in order to move carriers away from surfaces where photocorrosion can occur and towards catalytic surfaces. Finally, we discuss transient infrared attenuated total reflection (TATR) to probe the ultrafast reaction intermediates in a photo-driven chemical reaction.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Solar Photochemistry Program
OSTI Identifier:
1544534
Report Number(s):
NREL/JA-5900-73946
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
Physical Chemistry Chemical Physics
Additional Journal Information:
Journal Volume: 21; Journal Issue: 30
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; transient spectroscopy; surface carrier dynamics

Citation Formats

Chen, Xihan, Wang, Kang, and Beard, Matthew C. Ultrafast Probes at the Interfaces of Solar Energy Conversion Materials. United States: N. p., 2019. Web. doi:https://dx.doi.org/10.1039/C9CP02768H.
Chen, Xihan, Wang, Kang, & Beard, Matthew C. Ultrafast Probes at the Interfaces of Solar Energy Conversion Materials. United States. doi:https://dx.doi.org/10.1039/C9CP02768H.
Chen, Xihan, Wang, Kang, and Beard, Matthew C. Sat . "Ultrafast Probes at the Interfaces of Solar Energy Conversion Materials". United States. doi:https://dx.doi.org/10.1039/C9CP02768H.
@article{osti_1544534,
title = {Ultrafast Probes at the Interfaces of Solar Energy Conversion Materials},
author = {Chen, Xihan and Wang, Kang and Beard, Matthew C},
abstractNote = {Ultrafast carrier dynamics at interfaces plays a major role in governing solar energy conversion efficiency in solar conversion systems, especially in solar cells and photoelectrochemical devices. In this perspective, we discuss recent advances in ultrafast spectroscopic probes to understand the dynamics at such interfaces. Transient reflectance (TR) enables monitoring of the surface carriers that are within ~10 nm of the surface or interface of interest. Crucial parameters such as surface recombination velocity and carrier diffusion can be determined. When a strong surface or interfacial field is present the reflectance spectrum will exhibit Franz-Kelydesh oscillations. Monitoring the transient formation or decay of such oscillations informs about the interfacial field and is referred to as transient photoreflectance (TPR). Such fields are helpful in designing systems in order to move carriers away from surfaces where photocorrosion can occur and towards catalytic surfaces. Finally, we discuss transient infrared attenuated total reflection (TATR) to probe the ultrafast reaction intermediates in a photo-driven chemical reaction.},
doi = {https://dx.doi.org/10.1039/C9CP02768H},
journal = {Physical Chemistry Chemical Physics},
number = 30,
volume = 21,
place = {United States},
year = {2019},
month = {6}
}

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