Influence of Fluorination and Molecular Weight on the Morphology and Performance of PTB7:PC71BM Solar Cells

He, Xiaoxi; Mukherjee, Subhrangsu; Watkins, Scott; Chen, Ming; Qin, Tianshi; Thomsen, Lars; Ade, Harald; McNeill, Christopher R.

doi:10.1021/jp501222w

Cited by 46Organic Electronics and PhotovoltaicsOrganic Light-Emitting Diodes ResearchBlock Copolymer Self-Assembly

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Influence of Fluorination and Molecular Weight on the Morphology and Performance of PTB7:PC71BM Solar Cells

He, Xiaoxi, Mukherjee, Subhrangsu, Watkins, Scott, Chen, Ming, Qin, Tianshi, Thomsen, Lars, Ade, Harald, McNeill, Christopher R.·2014·The Journal of Physical Chemistry C

DOI 10.1021/jp501222w

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Abstract

The device performance and microstructure of a series of PTB7-based polymers with varied molecular weight and degree of fluorination are investigated. Although the energy level of the highest occupied molecular orbital is found to increase with degree of fluorination, a strong relative molecular weight dependence of device performance dominates any underlying fluorination-dependent trend on overall performance. Microstructural investigation using a combination of X-ray techniques reveals a striking effect of polymer molecular characteristics on film morphology, with the size of PC 71 BM domains systematically decreasing with increasing polymer molecular weight. Furthermore, the relative purity of the mixed PTB7:PC 71 BM domain is found to systematically decrease with increasing molecular weight. When domain sizes with and without the use of the solvent additive diiodooctane (DIO) are compared, the effectiveness of DIO in reducing PC 71 BM domain sizes is also found to be strongly dependent on the molecular weight of the polymer. It is found that molecular weights of at least 150 kg mol –1 are required for DIO to be effective in reducing the PC 71 BM domain size in order to produce high short-circuit current densities. Finally, it is shown that relatively high device efficiencies can be achieved with low degrees of fluorination; an efficiency of 4.6% is achieved for a degree of fluorination of only 5.3%.

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It has been proven in many cases that polymers with a high molecular weight could achieve a relatively high PCE.
“It has been proven in many cases that polymers with a high molecular weight could achieve a relatively high PCE. 31 -34”
From Recent progress in porphyrin-based materials for organic solar cells (2018) · cites this paper as [34]

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Authors: He, X., Mukherjee, S., Watkins, S., Chen, M., Qin, T., Thomsen, L., Ade, H., & McNeill, C. R.
Affiliations: University of Cambridge (GB)
North Carolina State University (US)
Commonwealth Scientific and Industrial Research Organisation (AU)
Australian Synchrotron (AU)
Monash University (AU)
Corresponding author: McNeill, Christopher R.
ORCID: He, Xiaoxi
Mukherjee, Subhrangsu
Watkins, Scott
Qin, Tianshi
Thomsen, Lars
Ade, Harald
McNeill, Christopher R.
Venue: The Journal of Physical Chemistry C
Publisher: American Chemical Society (ACS)
Published: 2014-05-06
Volume: 118
Issue: 19
Pages: 9918-9929
ISSN: 1932-7447 (ISSN-L)
1932-7455
DOI: 10.1021/jp501222w
OpenAlex: W2327729375
Cited by: 44
References: 46
Citations by year: 2026: 1 · 2023: 1 · 2022: 4 · 2021: 1 · 2020: 2 · 2019: 5 · 2018: 3 · 2017: 4 · 2016: 4 · 2015: 16 · 2014: 3
FWCI: 4.78
Type: journal article
Language: en
Open access: closed
Locations: The Journal of Physical Chemistry C (publishedVersion)
DORA PSI (Paul Scherrer Institute) (submittedVersion)
Funders: U.S. Department of Energy (DE-FG02-98ER45737)
Engineering and Physical Sciences Research Council (EP/G068356/1)
Australian Research Council (FT100100275)
Topics: Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Electronics and Photovoltaics
Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Light-Emitting Diodes Research
Physical Sciences › Materials Science › Materials Chemistry › Block Copolymer Self-Assembly
Keywords: PTB7:PC71BM, polymer solar cells, fluorination, molecular weight, film morphology, solvent additives, HOMO energy level, short-circuit current density, power conversion efficiency

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Influence of Fluorination and Molecular Weight on the Morphology and Performance of PTB7:PC71BM Solar Cells

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