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Title: Electrochemical Deposition of Conformal Semiconductor Layers in Nanoporous Oxides for Sensitized Photoelectrodes

Abstract

Nanoporous photoelectrodes with photoactive semiconductors have been investigated for various energy applications such as solar cells and photoelectrochemical cells, but the deposition of the semiconducting materials on the nanoporous electrodes has been very challenging due to pore clogging or complete pore filling. Here, we propose a band alignment model that explains the morphology of the electrochemically deposited semiconductor layer on the semiconducting nanoporous oxide electrode. Briefly, the coating material with a conduction band edge higher (i.e., more negative) than that of the electrode material forms a conformal coating, which maintains the initial nanoporous structure. As a result, a conformal CdSe layer can be electrodeposited onto TiO2 nanotubes, which can be used as a photoelectrode of a sensitized solar cell. The electron dynamics studies revealed that the CdSe-sensitized TiO2 nanotube electrode exhibited faster charge transport and slower charge recombination than its dye-sensitized counterpart, which has been ascribed to the passivation of surface traps and the physically blocked back-electron transfer by the CdSe layer as well as the higher conduction band of CdSe.

Authors:
 [1];  [2]; ORCiD logo [3];  [3]; ORCiD logo [1]
  1. Seoul National Univ., Seoul (Republic of Korea)
  2. National Univ. of Singapore (Singapore)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1578260
Report Number(s):
NREL/JA-5900-75595
Journal ID: ISSN 2470-1343; TRN: US2102169
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
ACS Omega
Additional Journal Information:
Journal Volume: 4; Journal Issue: 22; Journal ID: ISSN 2470-1343
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; nanoporous photoelectrodes; photoactive semiconductors; band alignment; electrochemistry

Citation Formats

Park, Jae Hyun, Wang, Qing, Zhu, Kai, Frank, Arthur J., and Kim, Jin Young. Electrochemical Deposition of Conformal Semiconductor Layers in Nanoporous Oxides for Sensitized Photoelectrodes. United States: N. p., 2019. Web. doi:10.1021/acsomega.9b02552.
Park, Jae Hyun, Wang, Qing, Zhu, Kai, Frank, Arthur J., & Kim, Jin Young. Electrochemical Deposition of Conformal Semiconductor Layers in Nanoporous Oxides for Sensitized Photoelectrodes. United States. https://doi.org/10.1021/acsomega.9b02552
Park, Jae Hyun, Wang, Qing, Zhu, Kai, Frank, Arthur J., and Kim, Jin Young. Wed . "Electrochemical Deposition of Conformal Semiconductor Layers in Nanoporous Oxides for Sensitized Photoelectrodes". United States. https://doi.org/10.1021/acsomega.9b02552. https://www.osti.gov/servlets/purl/1578260.
@article{osti_1578260,
title = {Electrochemical Deposition of Conformal Semiconductor Layers in Nanoporous Oxides for Sensitized Photoelectrodes},
author = {Park, Jae Hyun and Wang, Qing and Zhu, Kai and Frank, Arthur J. and Kim, Jin Young},
abstractNote = {Nanoporous photoelectrodes with photoactive semiconductors have been investigated for various energy applications such as solar cells and photoelectrochemical cells, but the deposition of the semiconducting materials on the nanoporous electrodes has been very challenging due to pore clogging or complete pore filling. Here, we propose a band alignment model that explains the morphology of the electrochemically deposited semiconductor layer on the semiconducting nanoporous oxide electrode. Briefly, the coating material with a conduction band edge higher (i.e., more negative) than that of the electrode material forms a conformal coating, which maintains the initial nanoporous structure. As a result, a conformal CdSe layer can be electrodeposited onto TiO2 nanotubes, which can be used as a photoelectrode of a sensitized solar cell. The electron dynamics studies revealed that the CdSe-sensitized TiO2 nanotube electrode exhibited faster charge transport and slower charge recombination than its dye-sensitized counterpart, which has been ascribed to the passivation of surface traps and the physically blocked back-electron transfer by the CdSe layer as well as the higher conduction band of CdSe.},
doi = {10.1021/acsomega.9b02552},
journal = {ACS Omega},
number = 22,
volume = 4,
place = {United States},
year = {2019},
month = {11}
}

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