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Title: Effect of an Adsorbent on Recombination and Band-Edge Movement in Dye-Sensitized TiO2 Solar Cells: Evidence for Surface Passivation

Abstract

The mechanism by which the adsorbent guanidinium affects the open-circuit photovoltage of dye-sensitized TiO{sub 2} nanocrystalline solar cells was investigated. The influence of the guanidinium cation on the rate of recombination and band-edge movement was measured by transient photovoltage. When guanidinium is present in the electrolyte recombination becomes slower by a factor of about 20. At the same time, the adsorbent causes the band edges to move downward, toward positive electrochemical potentials, by 100 mV. The collective effect of both a downward shift of the band edges and slower recombination, owing to the presence of guanidinium, results in an overall improvement in the open-circuit photovoltage.

Authors:
; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
977299
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry B; Journal Volume: 110; Journal Issue: 2006
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ADSORBENTS; CATIONS; ELECTROLYTES; PASSIVATION; RECOMBINATION; SOLAR CELLS; TRANSIENTS; Materials Science and Semiconductors; Solar Energy - Photovoltaics

Citation Formats

Frank, A. J., Kopidakis, N., and Neale, N. R. Effect of an Adsorbent on Recombination and Band-Edge Movement in Dye-Sensitized TiO2 Solar Cells: Evidence for Surface Passivation. United States: N. p., 2006. Web. doi:10.1021/jp0607364.
Frank, A. J., Kopidakis, N., & Neale, N. R. Effect of an Adsorbent on Recombination and Band-Edge Movement in Dye-Sensitized TiO2 Solar Cells: Evidence for Surface Passivation. United States. doi:10.1021/jp0607364.
Frank, A. J., Kopidakis, N., and Neale, N. R. Sun . "Effect of an Adsorbent on Recombination and Band-Edge Movement in Dye-Sensitized TiO2 Solar Cells: Evidence for Surface Passivation". United States. doi:10.1021/jp0607364.
@article{osti_977299,
title = {Effect of an Adsorbent on Recombination and Band-Edge Movement in Dye-Sensitized TiO2 Solar Cells: Evidence for Surface Passivation},
author = {Frank, A. J. and Kopidakis, N. and Neale, N. R.},
abstractNote = {The mechanism by which the adsorbent guanidinium affects the open-circuit photovoltage of dye-sensitized TiO{sub 2} nanocrystalline solar cells was investigated. The influence of the guanidinium cation on the rate of recombination and band-edge movement was measured by transient photovoltage. When guanidinium is present in the electrolyte recombination becomes slower by a factor of about 20. At the same time, the adsorbent causes the band edges to move downward, toward positive electrochemical potentials, by 100 mV. The collective effect of both a downward shift of the band edges and slower recombination, owing to the presence of guanidinium, results in an overall improvement in the open-circuit photovoltage.},
doi = {10.1021/jp0607364},
journal = {Journal of Physical Chemistry B},
number = 2006,
volume = 110,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}