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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.


Practical applications of vertical OTEDs with the 230 μm-thick PEDOT:PSS_ANL films (RA/P = 1.5).(a) Photographs for vertical OTEDs mounted on a desk lamp and the voltage/current measurement systems before and after the lamp light on. (b) Change of thermoelectric characteristics for the vertical OTEDs mounted on a desk lamp after turning on the desk lamp. The active area of the vertical OTEDs was 1.0 cm2.
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f6: Practical applications of vertical OTEDs with the 230 μm-thick PEDOT:PSS_ANL films (RA/P = 1.5).(a) Photographs for vertical OTEDs mounted on a desk lamp and the voltage/current measurement systems before and after the lamp light on. (b) Change of thermoelectric characteristics for the vertical OTEDs mounted on a desk lamp after turning on the desk lamp. The active area of the vertical OTEDs was 1.0 cm2.

Mentions: Finally, in order to examine the actual applicability, the vertical OTEDs with the 230 μm-thick PEDOT:PSS_ANL films were attached on the top cover of a desk lamp (see Fig. 6a). When the lamp light was turned on, the device voltage was gradually increased till 10 min. Then the voltage was fluctuated owing to the local temperature variation around the device, followed by saturation due to no more temperature rise at around 20 min. When the lamp was turned off, the voltage was slowly decreased for ca. 20 min because of cooling process in the lamp cover part. The trend of device current was quite similar to that of device voltage in the presence of slightly different fluctuation behavior between 10 min and 30 min. This is why the device current measurement was performed independently after finishing the voltage measurement, which might cause slightly different temperature conditions in the lamp cover part. Accordingly, the electrical power showed the similar rise and decay trend (see the bottom graph in Fig. 6b). This short test strongly supports that the present vertical OTEDs with the PEDOT:PSS_ANL films are convenient for practical applications and can continuously generate electrical power even in indoor environments (see Fig. S4 and video clips).


Acidity-Controlled Conducting Polymer Films for Organic Thermoelectric Devices with Horizontal and Vertical Architectures
Practical applications of vertical OTEDs with the 230 μm-thick PEDOT:PSS_ANL films (RA/P = 1.5).(a) Photographs for vertical OTEDs mounted on a desk lamp and the voltage/current measurement systems before and after the lamp light on. (b) Change of thermoelectric characteristics for the vertical OTEDs mounted on a desk lamp after turning on the desk lamp. The active area of the vertical OTEDs was 1.0 cm2.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f6: Practical applications of vertical OTEDs with the 230 μm-thick PEDOT:PSS_ANL films (RA/P = 1.5).(a) Photographs for vertical OTEDs mounted on a desk lamp and the voltage/current measurement systems before and after the lamp light on. (b) Change of thermoelectric characteristics for the vertical OTEDs mounted on a desk lamp after turning on the desk lamp. The active area of the vertical OTEDs was 1.0 cm2.
Mentions: Finally, in order to examine the actual applicability, the vertical OTEDs with the 230 μm-thick PEDOT:PSS_ANL films were attached on the top cover of a desk lamp (see Fig. 6a). When the lamp light was turned on, the device voltage was gradually increased till 10 min. Then the voltage was fluctuated owing to the local temperature variation around the device, followed by saturation due to no more temperature rise at around 20 min. When the lamp was turned off, the voltage was slowly decreased for ca. 20 min because of cooling process in the lamp cover part. The trend of device current was quite similar to that of device voltage in the presence of slightly different fluctuation behavior between 10 min and 30 min. This is why the device current measurement was performed independently after finishing the voltage measurement, which might cause slightly different temperature conditions in the lamp cover part. Accordingly, the electrical power showed the similar rise and decay trend (see the bottom graph in Fig. 6b). This short test strongly supports that the present vertical OTEDs with the PEDOT:PSS_ANL films are convenient for practical applications and can continuously generate electrical power even in indoor environments (see Fig. S4 and video clips).

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.