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Tailoring exciton diffusion and domain size in photovoltaic small molecules by processing

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Tailoring exciton diffusion and domain size in photovoltaic small molecules by processing. / Sajjad, Muhammad Tariq; Zhang, Yiwei; Geraghty, Paul B.; Mitchell, Valerie D.; Ruseckas, Arvydas; Blaszczyk, Oskar; Jones, David J; Samuel, Ifor David William.

In: Journal of Materials Chemistry C, Vol. In press, 19.04.2019.

Research output: Contribution to journalArticle

Harvard

Sajjad, MT, Zhang, Y, Geraghty, PB, Mitchell, VD, Ruseckas, A, Blaszczyk, O, Jones, DJ & Samuel, IDW 2019, 'Tailoring exciton diffusion and domain size in photovoltaic small molecules by processing', Journal of Materials Chemistry C, vol. In press. https://doi.org/10.1039/C9TC00951E

APA

Sajjad, M. T., Zhang, Y., Geraghty, P. B., Mitchell, V. D., Ruseckas, A., Blaszczyk, O., Jones, D. J., & Samuel, I. D. W. (2019). Tailoring exciton diffusion and domain size in photovoltaic small molecules by processing. Journal of Materials Chemistry C, In press. https://doi.org/10.1039/C9TC00951E

Vancouver

Sajjad MT, Zhang Y, Geraghty PB, Mitchell VD, Ruseckas A, Blaszczyk O et al. Tailoring exciton diffusion and domain size in photovoltaic small molecules by processing. Journal of Materials Chemistry C. 2019 Apr 19;In press. https://doi.org/10.1039/C9TC00951E

Author

Sajjad, Muhammad Tariq ; Zhang, Yiwei ; Geraghty, Paul B. ; Mitchell, Valerie D. ; Ruseckas, Arvydas ; Blaszczyk, Oskar ; Jones, David J ; Samuel, Ifor David William. / Tailoring exciton diffusion and domain size in photovoltaic small molecules by processing. In: Journal of Materials Chemistry C. 2019 ; Vol. In press.

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@article{5406a692bbc04185ac7d1d02bfc21fbb,
title = "Tailoring exciton diffusion and domain size in photovoltaic small molecules by processing",
abstract = "Exciton diffusion is an important part of light harvesting in organic photovoltaics (OPVs) because it enables excitons to reach the interface betweeen donor and acceptor and contribute to the photocurrent. Here we used simple and cost-effective techniques of thermal annealing and solvent vapour annealing to increase the exciton diffusion coefficient and exciton diffusion length in two liquid crystalline electron donor materials BQR and BTR. We found that the three-dimensional exciton diffusion length increased to ~40 nm upon annealing in both materials. Grazing-incidence wide angle X-ray scattering (GIWAXS) measurements show an increase of crystallite size to ~37 nm in both materials after thermal annealing. We determined an average domain size of these materials in the blends with PC71BM using diffusion-limited fluorescence quenching and found that it increased to 31 nm in BTR PC71BM blends and to 60 nm in BQR PC71BM blends. Our results provide understanding of how annealing improves device efficiency.",
author = "Sajjad, {Muhammad Tariq} and Yiwei Zhang and Geraghty, {Paul B.} and Mitchell, {Valerie D.} and Arvydas Ruseckas and Oskar Blaszczyk and Jones, {David J} and Samuel, {Ifor David William}",
note = "Funding: European Research Council (grant 321305); UK EPSRC for equipment grant (EP/L017008/1) and (EP/M508214/1) (OB).",
year = "2019",
month = apr,
day = "19",
doi = "10.1039/C9TC00951E",
language = "English",
volume = "In press",
journal = "Journal of Materials Chemistry C",
issn = "2050-7526",
publisher = "ROYAL SOC CHEMISTRY",

}

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TY - JOUR

T1 - Tailoring exciton diffusion and domain size in photovoltaic small molecules by processing

AU - Sajjad, Muhammad Tariq

AU - Zhang, Yiwei

AU - Geraghty, Paul B.

AU - Mitchell, Valerie D.

AU - Ruseckas, Arvydas

AU - Blaszczyk, Oskar

AU - Jones, David J

AU - Samuel, Ifor David William

N1 - Funding: European Research Council (grant 321305); UK EPSRC for equipment grant (EP/L017008/1) and (EP/M508214/1) (OB).

PY - 2019/4/19

Y1 - 2019/4/19

N2 - Exciton diffusion is an important part of light harvesting in organic photovoltaics (OPVs) because it enables excitons to reach the interface betweeen donor and acceptor and contribute to the photocurrent. Here we used simple and cost-effective techniques of thermal annealing and solvent vapour annealing to increase the exciton diffusion coefficient and exciton diffusion length in two liquid crystalline electron donor materials BQR and BTR. We found that the three-dimensional exciton diffusion length increased to ~40 nm upon annealing in both materials. Grazing-incidence wide angle X-ray scattering (GIWAXS) measurements show an increase of crystallite size to ~37 nm in both materials after thermal annealing. We determined an average domain size of these materials in the blends with PC71BM using diffusion-limited fluorescence quenching and found that it increased to 31 nm in BTR PC71BM blends and to 60 nm in BQR PC71BM blends. Our results provide understanding of how annealing improves device efficiency.

AB - Exciton diffusion is an important part of light harvesting in organic photovoltaics (OPVs) because it enables excitons to reach the interface betweeen donor and acceptor and contribute to the photocurrent. Here we used simple and cost-effective techniques of thermal annealing and solvent vapour annealing to increase the exciton diffusion coefficient and exciton diffusion length in two liquid crystalline electron donor materials BQR and BTR. We found that the three-dimensional exciton diffusion length increased to ~40 nm upon annealing in both materials. Grazing-incidence wide angle X-ray scattering (GIWAXS) measurements show an increase of crystallite size to ~37 nm in both materials after thermal annealing. We determined an average domain size of these materials in the blends with PC71BM using diffusion-limited fluorescence quenching and found that it increased to 31 nm in BTR PC71BM blends and to 60 nm in BQR PC71BM blends. Our results provide understanding of how annealing improves device efficiency.

U2 - 10.1039/C9TC00951E

DO - 10.1039/C9TC00951E

M3 - Article

VL - In press

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

SN - 2050-7526

ER -

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