Quantitative comparison of organic photovoltaic bulk heterojunction photostability under laser illumination

Lesoine, Michael D.; Bobbitt, Jonathan M.; Carr, John A.; Elshobaki, Moneim; Chaudhary, Sumit; Smith, Emily A.

doi:10.1021/jp509589g

Title: Quantitative comparison of organic photovoltaic bulk heterojunction photostability under laser illumination

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Abstract

The photostability of bulk heterojunction organic photovoltaic films containing a polymer donor and a fullerene-derivative acceptor was examined using resonance Raman spectroscopy and controlled laser power densities. The polymer donors were poly(3-hexylthiophene-2,5-diyl) (P3HT), poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] (PCDTBT), or poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}) (PTB7). Four sample preparation methods were studied: (i) thin or (ii) thick films with fast solvent evaporation under nitrogen, (iii) thick films with slow solvent evaporation under nitrogen, and (iv) thin films dried under nitrogen followed by thermal annealing. Polymer order was assessed by monitoring a Raman peak’s full width at half-maximum and location as a function of illumination time and laser power densities from 2.5 × 10³ to 2.5 × 10⁵ W cm^–2. Resonance Raman spectroscopy measurements show that before prolonged illumination, PCDTBT and PTB7 have the same initial order for all preparation conditions, while P3HT order improves with slow solvent drying or thermal annealing. All films exhibited changes to bulk heterojunction structure with 2.5 × 10⁵ Wcm^–2 laser illumination as measured by resonance Raman spectroscopy, and atomic force microscopy images show evidence of sample heating that affects the polymer over an area greater than the illumination profile. Furthermore, photostability data are important for proper characterization by techniques involving illumination and themore »« less

Authors:

Lesoine, Michael D. ^[1]; Bobbitt, Jonathan M. ^[1]; Carr, John A. ^[2]; Elshobaki, Moneim ^[3]; Chaudhary, Sumit ^[2]; Smith, Emily A. ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Iowa State Univ., Ames, IA (United States)
Iowa State Univ., Ames, IA (United States); Mansoura Univ., Mansoura (Egypt)

Publication Date:: Thu Nov 20 00:00:00 EST 2014

Research Org.:: Ames Lab., Ames, IA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1234517

Report Number(s):: IS-J-8422
Journal ID: ISSN 1932-7447

Grant/Contract Number:: ECCS1055930; AC02-07CH11358; GM915

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physical Chemistry. C

Additional Journal Information:: Journal Volume: 118; Journal Issue: 51; Journal ID: ISSN 1932-7447

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; resonance raman spectroscopy; thin films; P3HT; PCDTBT; PTB7

Citation Formats


                    Lesoine, Michael D., Bobbitt, Jonathan M., Carr, John A., Elshobaki, Moneim, Chaudhary, Sumit, and Smith, Emily A. Quantitative comparison of organic photovoltaic bulk heterojunction photostability under laser illumination.  United States: N. p., 2014. 
Web.  doi:10.1021/jp509589g.

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                    Lesoine, Michael D., Bobbitt, Jonathan M., Carr, John A., Elshobaki, Moneim, Chaudhary, Sumit, & Smith, Emily A. Quantitative comparison of organic photovoltaic bulk heterojunction photostability under laser illumination.  United States.  https://doi.org/10.1021/jp509589g

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                    Lesoine, Michael D., Bobbitt, Jonathan M., Carr, John A., Elshobaki, Moneim, Chaudhary, Sumit, and Smith, Emily A. Thu .  
"Quantitative comparison of organic photovoltaic bulk heterojunction photostability under laser illumination".  United States.  https://doi.org/10.1021/jp509589g.  https://www.osti.gov/servlets/purl/1234517.

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@article{osti_1234517,

  title        = {Quantitative comparison of organic photovoltaic bulk heterojunction photostability under laser illumination},

  author       = {Lesoine, Michael D. and Bobbitt, Jonathan M. and Carr, John A. and Elshobaki, Moneim and Chaudhary, Sumit and Smith, Emily A.},

  abstractNote = {The photostability of bulk heterojunction organic photovoltaic films containing a polymer donor and a fullerene-derivative acceptor was examined using resonance Raman spectroscopy and controlled laser power densities. The polymer donors were poly(3-hexylthiophene-2,5-diyl) (P3HT), poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] (PCDTBT), or poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}) (PTB7). Four sample preparation methods were studied: (i) thin or (ii) thick films with fast solvent evaporation under nitrogen, (iii) thick films with slow solvent evaporation under nitrogen, and (iv) thin films dried under nitrogen followed by thermal annealing. Polymer order was assessed by monitoring a Raman peak’s full width at half-maximum and location as a function of illumination time and laser power densities from 2.5 × 103 to 2.5 × 105 W cm–2. Resonance Raman spectroscopy measurements show that before prolonged illumination, PCDTBT and PTB7 have the same initial order for all preparation conditions, while P3HT order improves with slow solvent drying or thermal annealing. All films exhibited changes to bulk heterojunction structure with 2.5 × 105 Wcm–2 laser illumination as measured by resonance Raman spectroscopy, and atomic force microscopy images show evidence of sample heating that affects the polymer over an area greater than the illumination profile. Furthermore, photostability data are important for proper characterization by techniques involving illumination and the development of devices suitable for real-world applications.},

  doi          = {10.1021/jp509589g},

  journal      = {Journal of Physical Chemistry. C},

  number       = 51,

  volume       = 118,

  place        = {United States},

  year         = {Thu Nov 20 00:00:00 EST 2014},

  month        = {Thu Nov 20 00:00:00 EST 2014}

}

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