研究目的
Investigating the Hall voltage and mobility characterization in semimetallic polymers, specifically poly(3,4-ethylenedioxythiophene) systems, to understand the transport mechanisms influenced by topological and thermal disorder.
研究成果
The study demonstrated stable Hall voltages in semimetallic conducting polymers, enabling the derivation of temperature-dependent band mobilities and carrier concentrations using an organic phase model. The results highlighted the significant electron coherence across polymer chains, leading to comparatively high mobilities, especially in PEDOT:TfO systems. This approach provides a pathway to interpret the Hall-effect in conducting polymers and related disordered semiconductors.
研究不足
The study was limited by the experimental setup's inability to perform ac-modulation below 32 K due to Eddy current heating of the substrate holder. Additionally, the organic phase model's assumptions may not fully capture all aspects of disorder in molecular semiconductors.
1：Experimental Design and Method Selection:
The study utilized ac-Hall measurements with a lock-in amplifier to resolve Hall voltages in semimetallic polymers across a temperature range from room temperature to 32 K. An organic random phase model was applied to evaluate the results, accounting for tail states and thermal disorder.
2：Sample Selection and Data Sources:
Three representative semimetallic PEDOT systems were studied, including PEDOT:PSS with DMSO co-solvent additive and PEDOT:TfO treated with trifluoromethylsulfonic acid.
3：List of Experimental Equipment and Materials:
A van der Pauw Hall specimen was used for measurements, with a magnetic ac-field of 0.625 T root mean square amplitude modulated at 100 mHz. The setup included a LakeShore Hall Measurement System 8400 and Quantum Design DynaCool PPMS for resistivity and ac-Hall characterization.
4：625 T root mean square amplitude modulated at 100 mHz. The setup included a LakeShore Hall Measurement System 8400 and Quantum Design DynaCool PPMS for resistivity and ac-Hall characterization.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The ac-Hall technique was applied from 32 K up to 300 K, with a dc-current of 1 mA across the sample specimen. The Hall voltage was measured using a lock-in amplifier, with statistical evaluation for accuracy.
5：Data Analysis Methods:
The Hall constants and mobilities were derived from the data, with the organic phase model used to estimate band mobilities by considering correction factors for disorder screening.
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