Two-in-one alcohol-processed PEDOT electrodes produced by solvent exchange for organic solar cells
Poly(3,4-ethylenedioxythiophere):poly(styrenesulfonate) (PEDOT:PSS) is a common solution-processed electrode for printable organic solar cells. However, the water-dispersed PEDOT:PSS displays de-wetting issues when deposited on an active layer, which limits its application on printable top electrode...
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Veröffentlicht in: | Energy & environmental science 2023-04, Vol.16 (4), p.1511-1519 |
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Sprache: | eng |
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Zusammenfassung: | Poly(3,4-ethylenedioxythiophere):poly(styrenesulfonate) (PEDOT:PSS) is a common solution-processed electrode for printable organic solar cells. However, the water-dispersed PEDOT:PSS displays de-wetting issues when deposited on an active layer, which limits its application on printable top electrodes. In this work, we report a solvent exchange method to prepare alcohol-processed PEDOT:PSS. Spontaneous exchange of water and alcohol occurs when aqueous PEDOT:PSS in a dialysis membrane is immersed into alcohol. This is probably due to the polarity difference that induces different speeds to pass through the dialysis membrane. The residual PEDOT:PSS was further dispersed in ethanol and ethanol-based PEDOT:PSS (
e
-PEDOT:PSS) was obtained. The obtained e-PEDOT:PSS has good wetting ability and high electronic conductivity. The work function of e-PEDOT:PSS was tuned from 4.9 to 5.3 eV by adding an alcohol-based fluorinated formulation (PEDOT:F). The obtained formulation e-PEDOT:PSS was blade coated as the top electrode without additional hole-transporting layers (called 2-in-1 electrodes), and the fabricated devices based on e-PEDOT:PSS showed an efficiency of 14.02%.
A solvent-exchange method is introduced to obtain an alcohol-processed PEDOT:PSS formulation with good wettability, high conductivity and hole-transporting-layer property. |
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ISSN: | 1754-5692 1754-5706 |
DOI: | 10.1039/d2ee04183a |