Re-evaluation of recombination losses in dye-sensitized cells: The failure of dynamic relaxation methods to correctly predict diffusion length in nanoporous photoelectrodes

Piers R.F. Barnes; Lingxuan Liu; Xiaoe Li; Assaf Y. Anderson; Hawraa Kisserwan; Tarek H. Ghaddar; James R. Durrant; Brian C. O'Regan

doi:10.1021/nl901753k

Re-evaluation of recombination losses in dye-sensitized cells: The failure of dynamic relaxation methods to correctly predict diffusion length in nanoporous photoelectrodes

Piers R.F. Barnes, Lingxuan Liu, Xiaoe Li, Assaf Y. Anderson, Hawraa Kisserwan, Tarek H. Ghaddar, James R. Durrant, Brian C. O'Regan

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85 Scopus citations

Abstract

Photocurrents generated by thick, strongly absorbing, dye-sensitized cells were reduced when the electrolyte Iodine concentration was increased. Electron diffusion lengths measured using common transient techniques (L_n) were at least two times higher than diffusion lengths measured at steady state (L_IPCE). Charge collection efficiency calculated using Ln seriously overpredicted photocurrent, while L_IPCE correctly predicted photocurrent. This has implications for optimizing cell design.

Original language	English
Pages (from-to)	3532-3538
Number of pages	7
Journal	Nano Letters
Volume	9
Issue number	10
DOIs	https://doi.org/10.1021/nl901753k
State	Published - 14 Oct 2009
Externally published	Yes

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abstract = "Photocurrents generated by thick, strongly absorbing, dye-sensitized cells were reduced when the electrolyte Iodine concentration was increased. Electron diffusion lengths measured using common transient techniques (Ln) were at least two times higher than diffusion lengths measured at steady state (LIPCE). Charge collection efficiency calculated using Ln seriously overpredicted photocurrent, while LIPCE correctly predicted photocurrent. This has implications for optimizing cell design.",

author = "Barnes, {Piers R.F.} and Lingxuan Liu and Xiaoe Li and Anderson, {Assaf Y.} and Hawraa Kisserwan and Ghaddar, {Tarek H.} and Durrant, {James R.} and O'Regan, {Brian C.}",

year = "2009",

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doi = "10.1021/nl901753k",

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AU - Barnes, Piers R.F.

AU - Liu, Lingxuan

AU - Li, Xiaoe

AU - Anderson, Assaf Y.

AU - Kisserwan, Hawraa

AU - Ghaddar, Tarek H.

AU - Durrant, James R.

AU - O'Regan, Brian C.

PY - 2009/10/14

Y1 - 2009/10/14

N2 - Photocurrents generated by thick, strongly absorbing, dye-sensitized cells were reduced when the electrolyte Iodine concentration was increased. Electron diffusion lengths measured using common transient techniques (Ln) were at least two times higher than diffusion lengths measured at steady state (LIPCE). Charge collection efficiency calculated using Ln seriously overpredicted photocurrent, while LIPCE correctly predicted photocurrent. This has implications for optimizing cell design.

AB - Photocurrents generated by thick, strongly absorbing, dye-sensitized cells were reduced when the electrolyte Iodine concentration was increased. Electron diffusion lengths measured using common transient techniques (Ln) were at least two times higher than diffusion lengths measured at steady state (LIPCE). Charge collection efficiency calculated using Ln seriously overpredicted photocurrent, while LIPCE correctly predicted photocurrent. This has implications for optimizing cell design.

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Re-evaluation of recombination losses in dye-sensitized cells: The failure of dynamic relaxation methods to correctly predict diffusion length in nanoporous photoelectrodes

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