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Step towards High Power Factor in Acidic-Doped Poly(3-hexylthiophene) Systems.

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Dodecylbenzenesulfonic acid (DBSA) is a cost-effective p-type dopant for poly-(3-hexylthiophene) (P3HT) organic thermoelectrics. It enhances material properties and offers a less toxic alternative to F4TCNQ.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Thermoelectrics

Background:

  • Poly-(3-hexylthiophene) (P3HT) is a key organic semiconductor.
  • Doping is crucial for enhancing P3HT's thermoelectric properties.
  • F4TCNQ is a common but expensive dopant.

Purpose of the Study:

  • To evaluate dodecylbenzenesulfonic acid (DBSA) as a dopant for P3HT.
  • To investigate DBSA's effect on P3HT's morphology and electronic properties.
  • To explore DBSA as a cost-effective and less toxic alternative dopant.

Main Methods:

  • Spin-coating of P3HT thin films.
  • Doping P3HT with varying concentrations of DBSA (0.0001% to 20% v/v).
  • Characterization of electrical conductivity, Seebeck coefficient, and power factor.
  • Atomic force microscopy (AFM) for surface morphology analysis.

Main Results:

  • The optimal P3HT:DBSA composition (11% v/v DBSA) achieved a conductivity of 5.58 S·cm⁻¹, Seebeck coefficient of 69.7 μV·K⁻¹, and power factor of 2.706 μW·m⁻¹·K⁻².
  • Seebeck coefficients ranged from 59 μV·K⁻¹ to 352.9 μV·K⁻¹ depending on DBSA concentration.
  • Increased DBSA concentration reduced surface roughness, impacting conductivity.
  • Thermoelectric performance is comparable to P3HT doped with sulfuric acid or F4TCNQ.

Conclusions:

  • DBSA is a viable, cost-effective, and less toxic p-type dopant for P3HT.
  • DBSA acts as both a dopant and surfactant, influencing film morphology.
  • DBSA-doped P3HT shows promise for organic thermoelectric applications.