Abstract / Description of output
Fullerene intercalation between the side chains of conjugated polymers has a detrimental impact on both charge separation and charge transport processes in bulk heterojunction (BHJ) organic photovoltaic cells (OPVs). In situ grazing incidence X-ray scattering experiments allow to characterize the structure formation, drying kinetics, and intercalation in blends of phenyl-c61-butyric acid methyl ester (PC60BM) and poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) named (pBTTT-C14) from their 1,2-orthodichlorobenzene (oDCB) solutions with different volume fractions of dodecanoic acid methyl ester (Me12) as a solvent additive. The structure formation process during evaporation of the solvent:additive mixture can be described by five periods, which are correlated to a multistep contraction of the lamellar stacking of the bimolecular crystals. The onset of crystallization is delayed by increasing the additive volume fraction in the coating solution leading to a promoted crystallinity. A conclusive picture of fullerene intercalation and additive-tuned structural evolution during the drying of thin films of the polymer:fullerene BHJ blends will be presented. © 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Original language | English |
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Article number | 1900508 |
Journal | Solar RRL |
Volume | 4 |
Issue number | 3 |
Early online date | 24 Jan 2020 |
DOIs | |
Publication status | E-pub ahead of print - 24 Jan 2020 |
Keywords / Materials (for Non-textual outputs)
- Additives
- Butyric acid
- Conjugated polymers
- Crystal structure
- Crystallinity
- Esters
- Fatty acids
- Fullerenes
- Heterojunctions
- Intercalation
- Organic solar cells
- Photoelectrochemical cells
- Photovoltaic cells
- Polymer blends
- Polymer films
- Volume fraction
- X ray scattering
- Bulk heterojunction
- Bulk heterojunction (BHJ)
- Charge transport process
- Grazing-incidence x-ray scattering
- Intercalation process
- Organic photovoltaic cell (OPVs)
- Structural evolution
- Structure formations
- Thin films