Thickness-dependent thermoelectric power factor of polymer-functionalized semiconducting carbon nanotube thin films

Figures & data

Figure 1. (a) Schematic of the separation of s-SWNTs from as-received mixture by conjugated polymers. (b) Absorption spectra of s-SWNTs dispersed by PF12 in toluene (brown line) and by SDOC in D₂O (grey line). (c) Height profiles of transferred films on PET substrates. The inset photograph shows the reddish brown PF12/SWNT-320 film on PET. (d) Absorption spectra of an s-SWNT film in the UV-Vis-NIR (brown) and NIR-MIR (pale red) regions. A pale blue line shows the MIR spectra of a SDOC-dispersed film as a reference. Sharp background spikes (*) in the MIR region (0.09–0.22 eV) are derived from the vibration modes of PET.

Figure 2. (a) Absorption spectra of PF12/s-SWNT-340 before and after doping with AgTFSI up to 8 mg mL⁻¹ in butanol. (b) Evolution of plasmon resonance (PR) band as a function of AgTFSI concentration for 220 nm-, 300 nm-, and 340 nm-thick PF12/s-SWNT films. The PR intensity at 0.1 eV is normalized by the initial S₁₁ peak at 0.8 eV.

Figure 3. Thermoelectric properties of (a) PF12/s-SWNT-160, (b) PF12/s-SWNT-300, and (c) PF12/s-SWNT-540 after AgTFSI doping with different concentration. (d) Optimized power factors as a function of film thickness.

Figure 4. (a) Thermoelectric properties of P3DT/s-SWNT-180, P3DT/s-SWNT-320, and P3DT/s-SWNT-440. (b) Optimized power factors as a function of film thickness.