Please use this identifier to cite or link to this item: https://doi.org/10.1021/nn403714s
Title: Determination of sensitizer regeneration efficiency in dye-sensitized solar cells
Authors: Li, F.
Jennings, J.R. 
Wang, Q. 
Keywords: dye-sensitized solar cells
impedance spectroscopy
incident photon-to-current efficiency
recombination
regeneration
transient absorption
working conditions
Issue Date: 24-Sep-2013
Source: Li, F., Jennings, J.R., Wang, Q. (2013-09-24). Determination of sensitizer regeneration efficiency in dye-sensitized solar cells. ACS Nano 7 (9) : 8233-8242. ScholarBank@NUS Repository. https://doi.org/10.1021/nn403714s
Abstract: Regeneration of the sensitizing dye in dye-sensitized solar cells (DSCs) is frequently studied using the transient absorption (TA) technique. However, TA measurements are generally not performed using complete DSCs at the maximum power point (MPP) on the current-voltage (j-V) characteristic, and the electron concentration in the nanocrystalline TiO2 films used in these devices is often not well characterized, which may lead to results that are not relevant to actual solar cell operation. Here, dye regeneration kinetics were studied at the MPP and at open circuit (where interpretation of results is simpler) in DSCs employing a "robust" nonvolatile 3- methoxypropionitrile-based electrolyte solution. Using a combination of TA, differential incident photon-to-current efficiency measurements, and impedance spectroscopy, the dependence of electron-dye recombination rate and overall sensitizer regeneration efficiency on TiO2 electron concentration is unambiguously demonstrated. We also examine the validity of a commonly used approach for determining regeneration efficiency in which the electron-dye recombination rate constant is estimated from TA decays of cells employing a redox-inactive electrolyte solution. We find evidence that this widespread practice may be unsuitable for accurate determination of the regeneration rate constant or efficiency. We go on to show that, despite near-quantitative regeneration at short circuit or low photovoltage, power conversion efficiency is limited by inefficient regeneration in stable DSCs with practically relevant electrolyte solutions. © 2013 American Chemical Society.
Source Title: ACS Nano
URI: http://scholarbank.nus.edu.sg/handle/10635/86253
ISSN: 19360851
DOI: 10.1021/nn403714s
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

43
checked on Feb 14, 2018

WEB OF SCIENCETM
Citations

42
checked on Feb 14, 2018

Page view(s)

34
checked on Feb 11, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.