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Acidity-Controlled Conducting Polymer Films for Organic Thermoelectric Devices with Horizontal and Vertical Architectures

View Article: PubMed Central - PubMed

ABSTRACT

Organic thermoelectric devices (OTEDs) are recognized one of the next generation energy conversion platforms because of their huge potentials for securing electricity continuously from even tiny heat sources in our daily life. The advantage of OTEDs can be attributable to the design freedom in device shapes and the low-cost fabrication by employing solution coating processes at low temperatures. As one of the major OTE materials to date, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has been used, but no study has been yet carried out on its acidity control even though the acidic components in OTEDs can seriously affect the device performance upon operation. Here we demonstrate that the addition of aniline (a weak base) can control the acidity of PEDOT:PSS and enhance the performance of OTEDs. In particular, the vertical OTEDs with aniline-doped PEDOT:PSS films (active area = 1.0 cm2) could continuously generate electricity (0.06 nW) even at low temperatures (<38 °C) when they were mounted on a desk lamp (power = 24 W).

No MeSH data available.


(a) Thermoelectric (TE) characteristics (voltage, current, power, and Seebeck coefficient (S)) of horizontal (single stacked) OTEDs with the PEDOT:PSS_ANL films (RA/P = 1.5) according to the film thickness (t) as a function of temperature difference. (b) TE characteristics as a function of film thickness at ΔT = 50 K.
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f4: (a) Thermoelectric (TE) characteristics (voltage, current, power, and Seebeck coefficient (S)) of horizontal (single stacked) OTEDs with the PEDOT:PSS_ANL films (RA/P = 1.5) according to the film thickness (t) as a function of temperature difference. (b) TE characteristics as a function of film thickness at ΔT = 50 K.

Mentions: Next, the thickness of the PEDOT:PSS_ANL films was changed by fixing the aniline content at RA/P = 1.5. As shown in Fig. 4a, the device voltage was almost linearly increased to the negative direction with the temperature irrespective of the film thickness. This result supports that the thickness range (from 70 nm to 230 μm) here is appropriate to operate OTEDs with proper thermoelectric functions. As the film thickness increased, the (negative) slope of device voltage became gradually low leading to the decreasing trend in the Seebeck coefficient (see also Fig. 4b). In contrast, the device current was pronouncedly increased from −1.639 μA to −43.30 μA as the film thickness increased from 70 nm to 230 μm. This means that more charges could be generated in the thicker films due to their relatively larger volumes. As a result, according to the bigger influence of device current, the higher electrical power generation was achieved for the thicker films even though the electric power became slow down after 25 μm (see the power factor trend in Table S2).


Acidity-Controlled Conducting Polymer Films for Organic Thermoelectric Devices with Horizontal and Vertical Architectures
(a) Thermoelectric (TE) characteristics (voltage, current, power, and Seebeck coefficient (S)) of horizontal (single stacked) OTEDs with the PEDOT:PSS_ANL films (RA/P = 1.5) according to the film thickness (t) as a function of temperature difference. (b) TE characteristics as a function of film thickness at ΔT = 50 K.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5035924&req=5

f4: (a) Thermoelectric (TE) characteristics (voltage, current, power, and Seebeck coefficient (S)) of horizontal (single stacked) OTEDs with the PEDOT:PSS_ANL films (RA/P = 1.5) according to the film thickness (t) as a function of temperature difference. (b) TE characteristics as a function of film thickness at ΔT = 50 K.
Mentions: Next, the thickness of the PEDOT:PSS_ANL films was changed by fixing the aniline content at RA/P = 1.5. As shown in Fig. 4a, the device voltage was almost linearly increased to the negative direction with the temperature irrespective of the film thickness. This result supports that the thickness range (from 70 nm to 230 μm) here is appropriate to operate OTEDs with proper thermoelectric functions. As the film thickness increased, the (negative) slope of device voltage became gradually low leading to the decreasing trend in the Seebeck coefficient (see also Fig. 4b). In contrast, the device current was pronouncedly increased from −1.639 μA to −43.30 μA as the film thickness increased from 70 nm to 230 μm. This means that more charges could be generated in the thicker films due to their relatively larger volumes. As a result, according to the bigger influence of device current, the higher electrical power generation was achieved for the thicker films even though the electric power became slow down after 25 μm (see the power factor trend in Table S2).

View Article: PubMed Central - PubMed

ABSTRACT

Organic thermoelectric devices (OTEDs) are recognized one of the next generation energy conversion platforms because of their huge potentials for securing electricity continuously from even tiny heat sources in our daily life. The advantage of OTEDs can be attributable to the design freedom in device shapes and the low-cost fabrication by employing solution coating processes at low temperatures. As one of the major OTE materials to date, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has been used, but no study has been yet carried out on its acidity control even though the acidic components in OTEDs can seriously affect the device performance upon operation. Here we demonstrate that the addition of aniline (a weak base) can control the acidity of PEDOT:PSS and enhance the performance of OTEDs. In particular, the vertical OTEDs with aniline-doped PEDOT:PSS films (active area = 1.0 cm2) could continuously generate electricity (0.06 nW) even at low temperatures (<38 °C) when they were mounted on a desk lamp (power = 24 W).

No MeSH data available.