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Title: Modulating Carrier Transport via Defect Engineering in Solar Water Splitting Devices

Abstract

Developing sustainable solar water splitting devices requires efficient separation and transport of photogenerated carriers. In this Perspective, we examine carrier transport in semiconductor photoelectrodes using bismuth vanadate as a primary model system and highlight strategies to significantly improve carrier delivery through defect engineering. To improve electron transport in low-mobility semiconductors, we introduce two distinct bulk doping methods, by homogeneously enhancing the bulk defect level or by forming distributed homojunctions with graded doping. Next, we demonstrate the use of structural boundaries as extrinsic pathways for fast electron transport, thus providing novel insights to engineer materials’ macroscopic conductivity. Third, we describe the importance of interface design in terms of structural, chemical, and electronic matching at the back contact to suppress carrier recombination. Lastly, we highlight the methods for surface defect control via passivation and catalysis and give a brief outlook of research challenges and opportunities for solar water splitting.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1524556
Report Number(s):
BNL-211727-2019-JAAM
Journal ID: ISSN 2380-8195
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 4; Journal Issue: 4; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Zhang, Wenrui, and Liu, Mingzhao. Modulating Carrier Transport via Defect Engineering in Solar Water Splitting Devices. United States: N. p., 2019. Web. https://doi.org/10.1021/acsenergylett.9b00276.
Zhang, Wenrui, & Liu, Mingzhao. Modulating Carrier Transport via Defect Engineering in Solar Water Splitting Devices. United States. https://doi.org/10.1021/acsenergylett.9b00276
Zhang, Wenrui, and Liu, Mingzhao. Tue . "Modulating Carrier Transport via Defect Engineering in Solar Water Splitting Devices". United States. https://doi.org/10.1021/acsenergylett.9b00276. https://www.osti.gov/servlets/purl/1524556.
@article{osti_1524556,
title = {Modulating Carrier Transport via Defect Engineering in Solar Water Splitting Devices},
author = {Zhang, Wenrui and Liu, Mingzhao},
abstractNote = {Developing sustainable solar water splitting devices requires efficient separation and transport of photogenerated carriers. In this Perspective, we examine carrier transport in semiconductor photoelectrodes using bismuth vanadate as a primary model system and highlight strategies to significantly improve carrier delivery through defect engineering. To improve electron transport in low-mobility semiconductors, we introduce two distinct bulk doping methods, by homogeneously enhancing the bulk defect level or by forming distributed homojunctions with graded doping. Next, we demonstrate the use of structural boundaries as extrinsic pathways for fast electron transport, thus providing novel insights to engineer materials’ macroscopic conductivity. Third, we describe the importance of interface design in terms of structural, chemical, and electronic matching at the back contact to suppress carrier recombination. Lastly, we highlight the methods for surface defect control via passivation and catalysis and give a brief outlook of research challenges and opportunities for solar water splitting.},
doi = {10.1021/acsenergylett.9b00276},
journal = {ACS Energy Letters},
number = 4,
volume = 4,
place = {United States},
year = {2019},
month = {3}
}

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Works referencing / citing this record:

Defect Engineering for Photocatalysis: From Ternary to Perovskite Oxynitrides
journal, February 2020


Strategies for enhancing the photocurrent, photovoltage, and stability of photoelectrodes for photoelectrochemical water splitting
journal, January 2019

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