Using Solubility Parameters to Model More Environmentally Friendly Solvent Blends for Organic Solar Cell Active LayersDepartment of Engineering and Chemical Sciences, Karlstad University, Karlstad, Sweden
Ishita Jalan a, Ellen Moon b, Leif Ericsson b, Andrea Muntean b, Jan van Stam a
a Department of Engineering and Chemical Sciences, Karlstad University, Karlstad, Sweden
b Department of Engineering and Physics, Karlstad University, Karlstad, Sweden
Online Conference
Proceedings of NFA-Based Organic Solar Cells: Materials, Morphology and Fundamentals (NFASC)
Online, Spain, 2021 February 3rd - 4th
Organizers: Natalie Banerji and Feng Gao
Oral, Ishita Jalan, presentation 011
DOI: https://doi.org/10.29363/nanoge.nfasc.2021.011
Publication date: 25th January 2021

Solution‐processed polymer bulk heterojunction organic photovoltaic (BHJ-OPV) devices have gained serious attention during the last decade. They are one of the leading next-generation photovoltaic technologies for low-cost power production1. The morphology of the active layer is one of the important factors for solar cell performance. To control the morphology, one needs to understand the morphology formation on a molecular level. It is known that molecular interactions govern morphology formation and purity of mixed domains of conjugated polymers and small-molecule2. Therefore, understanding these interactions relations would give us insight into the challenges of coating OPV from green solvent to achieve the required nanostructured interpenetrating network of donor and acceptor domains based on a rational choice of solvent3.

In this work, we first calculate the Hansen solubility parameters (HSP)3,4 of the donor and acceptor materials, followed by careful choice of solvents with selective relative solubilities for the two materials. After the theoretical screening procedure, solubility tests were performed to determine the HSP parameters relevant to the junction of the system. Then finally, thin films were prepared by spin-coating from the solvent screened using this method. Characterization of the morphology and phase separation was done using Atomic force microscopy-based infrared spectroscopy (AFM-IR). Our results show that the blend film morphology for films prepared in this way is similar to the one for films prepared from the commonly used halogenated solvents.

 

References:

1. Brabec, C. J. et al. Polymer-Fullerene Bulk-Heterojunction Solar Cells. Adv. Mater. 22, 3839–3856 (2010).

2. Ye, L. et al. Quantitative relations between interaction parameter, miscibility and function in organic solar cells. Nat. Mater. 17, 253–260 (2018).

3. Holmes, N. P. et al. Unravelling donor-acceptor film morphology formation for environmentally-friendly OPV ink formulations. Green Chem. 21, (2019).

4. Jalan, I., Lundin, L. & van Stam, J. Using Solubility Parameters to Model More Environmentally Friendly Solvent Blends for Organic Solar Cell Active Layers. Materials (Basel). 12, (2019).

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