Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material

Yun Long; Gordon James Hedley; Arvydas Ruseckas; Mithun Chowdhury; Thomas Jean Roland; Luis Serrano; Graeme  Cooke; Ifor David William Samuel

doi:10.1021/acsami.6b16487

Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material

Yun Long, Gordon James Hedley, Arvydas Ruseckas, Mithun Chowdhury, Thomas Jean Roland, Luis Serrano, Graeme Cooke, Ifor David William Samuel

Research output: Contribution to journal › Article › peer-review

Abstract

Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh₂)₂. Three complementary time-resolved fluorescence measurements were performed: quenching in planar heterojunctions with an electron acceptor; exciton-exciton annihilation; and fluorescence depolarization. The average exciton diffusivity increases upon annealing from 1.6 × 10^-3 cm² s^-1 to 3.6 × 10^-3 cm² s^-1, resulting in an enhancement of the mean two–dimensional exciton diffusion length (L_D=√4Dτ) from 15 nm to 27 nm. About 30% of the excitons get trapped very quickly in as-cast films. The high exciton diffusion coefficient of the material leads to it being able to harvest excitons efficiently from large donor domains in bulk heterojunctions.

Original language	English
Pages (from-to)	14945-14952
Journal	ACS Applied Materials & Interfaces
Volume	9
Issue number	17
Early online date	30 Mar 2017
DOIs	https://doi.org/10.1021/acsami.6b16487
Publication status	Published - 3 May 2017

Keywords

Organic solar cells
Organic semiconductors
Light harvesting
Excitation energy transfer
Bulk heterojunctions

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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DTS_Revised_finalAccepted author manuscript, 1.7 MB
DTS_Revised_SIAccepted author manuscript, 464 KB
Long-2017-Effect-of-annealing-AMI-CC
© 2017 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Final published version, 2.72 MBLicence: CC BY

ERC Advanced Grant EXCITON: EU FP7 ERC Advanced Grant 2012 EXCITON
Samuel, I. D. W. (PI)
European Research Council
1/04/13 → 30/03/19
Project: Standard
The Influence of Excited State Physics: The influence of Excited State Physics in Conjugated Polymer Devices
Samuel, I. D. W. (PI)
EPSRC
1/10/12 → 30/09/15
Project: Standard

Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material (dataset)
Long, Y. (Creator), Hedley, G. J. (Creator), Ruseckas, A. (Creator), Chowdhury, M. (Creator), Roland, T. J. (Creator), Serrano, L. (Creator), Cooke, G. (Creator) & Samuel, I. D. W. (Creator), University of St Andrews, 26 Apr 2017
DOI: 10.17630/0d50c108-0ebc-4701-91e9-0d9a1fb7f8db
Dataset

File

Cite this

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abstract = "Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh2)2. Three complementary time-resolved fluorescence measurements were performed: quenching in planar heterojunctions with an electron acceptor; exciton-exciton annihilation; and fluorescence depolarization. The average exciton diffusivity increases upon annealing from 1.6 × 10-3 cm2 s-1 to 3.6 × 10-3 cm2 s-1, resulting in an enhancement of the mean two–dimensional exciton diffusion length (LD=√4Dτ) from 15 nm to 27 nm. About 30% of the excitons get trapped very quickly in as-cast films. The high exciton diffusion coefficient of the material leads to it being able to harvest excitons efficiently from large donor domains in bulk heterojunctions. ",

keywords = "Organic solar cells, Organic semiconductors, Light harvesting, Excitation energy transfer, Bulk heterojunctions",

author = "Yun Long and Hedley, {Gordon James} and Arvydas Ruseckas and Mithun Chowdhury and Roland, {Thomas Jean} and Luis Serrano and Graeme Cooke and Samuel, {Ifor David William}",

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T1 - Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material

AU - Long, Yun

AU - Hedley, Gordon James

AU - Ruseckas, Arvydas

AU - Chowdhury, Mithun

AU - Roland, Thomas Jean

AU - Serrano, Luis

AU - Cooke, Graeme

AU - Samuel, Ifor David William

PY - 2017/5/3

Y1 - 2017/5/3

N2 - Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh2)2. Three complementary time-resolved fluorescence measurements were performed: quenching in planar heterojunctions with an electron acceptor; exciton-exciton annihilation; and fluorescence depolarization. The average exciton diffusivity increases upon annealing from 1.6 × 10-3 cm2 s-1 to 3.6 × 10-3 cm2 s-1, resulting in an enhancement of the mean two–dimensional exciton diffusion length (LD=√4Dτ) from 15 nm to 27 nm. About 30% of the excitons get trapped very quickly in as-cast films. The high exciton diffusion coefficient of the material leads to it being able to harvest excitons efficiently from large donor domains in bulk heterojunctions.

AB - Singlet exciton diffusion was studied in the efficient organic photovoltaic electron donor material DTS(FBTTh2)2. Three complementary time-resolved fluorescence measurements were performed: quenching in planar heterojunctions with an electron acceptor; exciton-exciton annihilation; and fluorescence depolarization. The average exciton diffusivity increases upon annealing from 1.6 × 10-3 cm2 s-1 to 3.6 × 10-3 cm2 s-1, resulting in an enhancement of the mean two–dimensional exciton diffusion length (LD=√4Dτ) from 15 nm to 27 nm. About 30% of the excitons get trapped very quickly in as-cast films. The high exciton diffusion coefficient of the material leads to it being able to harvest excitons efficiently from large donor domains in bulk heterojunctions.

KW - Organic solar cells

KW - Organic semiconductors

KW - Light harvesting

KW - Excitation energy transfer

KW - Bulk heterojunctions

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DO - 10.1021/acsami.6b16487

M3 - Article

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VL - 9

SP - 14945

EP - 14952

JO - ACS Applied Materials & Interfaces

JF - ACS Applied Materials & Interfaces

IS - 17

ER -

Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material

Abstract

Keywords

UN SDGs

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Projects

ERC Advanced Grant EXCITON: EU FP7 ERC Advanced Grant 2012 EXCITON

The Influence of Excited State Physics: The influence of Excited State Physics in Conjugated Polymer Devices

Datasets

Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material (dataset)

Cite this