研究目的
To develop a low-cost and fast in-solution treatment method for producing free-standing conductive dark-PEDOT (d-PEDOT) paste as an alternative to standard metal contacts.
研究成果
A fast and low-cost method to prepare a dark conductive PEDOT paste for producing free-standing foils was demonstrated. The material exhibits a conductivity of 500 Scm-1, making it a viable alternative to conventional metal contacts.
研究不足
The intrinsic conductivity of PEDOT:PSS does not exceed 1 Scm-1, requiring post-deposition processes to increase conductivity. The method's scalability and integration into existing production lines need further investigation.
1：Experimental Design and Method Selection:
The study involves the synthesis of a conductive dark-PEDOT (d-PEDOT) paste through acid-induced phase separation using sulphuric acid. The method is designed to be industrially implementable.
2：Sample Selection and Data Sources:
PEDOT:PSS aqueous solution and high purity sulphuric acid were used as received. Glass square supports were used as substrates for deposition.
3：List of Experimental Equipment and Materials:
PEDOT:PSS aqueous solution (1.1% w/w), sulphuric acid (96%), glass substrates, plastic syringe, shadow mask, hot-plate, vertical Absolute Digimatic Indicator Mitutoyo 543-472B, probe station equipped with tungsten micromanipulators, Keithley K236 SMU, and Keithley K6512 electrometer.
4：1% w/w), sulphuric acid (96%), glass substrates, plastic syringe, shadow mask, hot-plate, vertical Absolute Digimatic Indicator Mitutoyo 543-472B, probe station equipped with tungsten micromanipulators, Keithley K236 SMU, and Keithley K6512 electrometer. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The PEDOT:PSS solution was acidified with sulphuric acid leading to phase separation. The precipitate was separated, rinsed, and deposited on pre-heated glass substrates using a syringe and shadow mask. The layers were dried on a hot plate, resulting in free-standing foils.
5：Data Analysis Methods:
Electrical characterization was performed using two and four point probe measurements to determine conductivity and sheet resistance.
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PEDOT:PSS aqueous solution
1.1% w/w
Sigma Aldrich
Used as the base material for synthesizing conductive dark-PEDOT (d-PEDOT) paste.
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sulphuric acid
96%
Basf
Used for acid-induced phase separation in the synthesis of d-PEDOT paste.
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vertical Absolute Digimatic Indicator
Mitutoyo 543-472B
Mitutoyo
Used to determine the thickness of samples with an accuracy of ± 1 μm.
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probe station
Equipped with tungsten micromanipulators for performing electrical measurements.
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Keithley K236 SMU
Keithley
Used for electrical measurements.
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Keithley K6512 electrometer
Keithley
Used for electrical measurements.
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