Investigation of P3HT electrochromic polymer films prepared by ultrasonication of polymer solutions

Jiemsakul, Thanakorn; Jiramitmongkon, Kanpitcha; Asawapirom, Udom; Chotsuwan, Chuleekorn

doi:10.1007/s10853-017-1109-3

Cited by 12 publications

(12 citation statements)

References 30 publications

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“…This prompted our attempt to study the processes of their electrochemical precipitation/solubilisation as well as the associated doping/de-doping phenomena in solution. Here, we present the first comprehensive spectroelectrochemical account of the behaviour of regioregular (RR-P3HT) and regiorandom—statistical—(ST-P3HT) poly(3-hexylthiophenes) in solution, in contrast to the many reports dealing with P3HT films merely deposited from solution (Trznadel et al 1998; Jiemsakul et al 2017). …”

Section: Introductionmentioning

confidence: 99%

Spectroelectrochemistry of poly(3-hexylthiophenes) in solution

Kepska

Jarosz

Januszkiewicz-Kaleniak

et al. 2017

Chem. Pap.

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The first comprehensive spectroelectrochemical account of the behaviour of regioregular (RR-P3HT) and statistical (ST-P3HT) poly(3-hexylthiophenes) in solution is presented, in contrast to the many reports dealing with P3HT films merely deposited from solution. The conducted experiments revealed that the two types of P3HTs behave in sharply different ways upon the application of electrochemical stimuli: ST-P3HT readily precipitates at mildly oxidative potentials, while the precipitation of the RR-P3HT takes place to a much lesser extent, even at higher potentials. The two polymers, studied via UV-Vis-NIR-EPR spectroelectrochemistry, exhibited properties mostly in line with earlier reports. Further study revealed that RR-P3HT largely remains in solution, even in its doped form, whereas only traces of the doped ST-P3HT are observed in solution in identical conditions. The high concentration of the doped RR-P3HT in solution can be explained by its ability to form soluble polymer agglomerates, in which the positive charge of the p-doped chains is stabilised by and delocalised over neighbouring, interacting undoped chains. These conclusions are consistent with SEM micrographs, which show that after cycling the potential of the electrode in a solution of ST-P3HT, a uniform layer is formed, covering most of the surface of the electrode, whereas in the case of RR-P3HT surface coverage is marginal and formed layer has the appearance of veined blotches. Graphical abstract

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Section: Introductionmentioning

confidence: 99%

Spectroelectrochemistry of poly(3-hexylthiophenes) in solution

Kepska

Jarosz

Januszkiewicz-Kaleniak

et al. 2017

Chem. Pap.

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“…As apparent from the image (Figure ), the device changes its color from magenta, when unbiased, to a transparent state by applying a voltage of 1 V, and the magenta color can be reinstalled with the same bias when applied with opposite polarity (i.e, −1 V). The most likely reason for this observed color change is conversion of P3HT to its polaron form on oxidation when biased with 1 V followed by a reduction of polaron to neural P3HT on bias reversal. ,, …”

Section: Resultsmentioning

confidence: 97%

“…The most likely reason for this observed color change is conversion of P3HT to its polaron form on oxidation when biased with 1 V followed by a reduction of polaron to neural P3HT on bias reversal. 30,37,38 Spectroscopic (absorption) variation corresponding to the above-mentioned bias-induced color switching can be seen using in situ UV−vis spectroscopy of the fabricated device (Figure 2a). Figure 2a shows absorbance spectra of the electrochromic device along with its actual images under different bias.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…First of all, when device is unbiased, in the "initial" state (red curve, unhooked to the power supply), maximum absorption is observed in the vicinity of 550 nm, indicating the absorption of green color, meaning that the presence of red and blue colors (appearing magenta) in the transmitted light is responsible for the magenta appearance to the device. 37 At 1 V bias (black curve), the absorbance decreases and all the wavelengths very poorly get absorbed almost equally, which allows all the wavelengths on the visible region to transmit, thus making the device appear transparent to the visible spectrum. On bias reversal (−1 V), the magenta color gets reinstalled as is evident from the increase in the absorption back in the green region, mimicking the same spectrum as that of the unbiased device.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The fabricated device shows more than 50% color contrast corresponding to 550 nm when switched between magenta and transparent states, which is better, as will be substantiated later quantitatively, in comparison to the previously reported device based on P3HT. 37,39 The color contrast, defined by eq 1, has been calculated from the UV−vis spectra recorded in transmission mode as shown in Figure S2.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Polythiophene–PCBM-Based All-Organic Electrochromic Device: Fast and Flexible

Chaudhary

Pathak

Tanwar

et al. 2019

ACS Appl. Electron. Mater.

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A fast and flexible all-organic electrochromic device, fabricated using polythiophene and PCBM as active materials and plastic substrate, which shows very good power efficiency as well, has been reported here. The device shows quantifiable improvement in electrochromic performance using parameters like switching speed, coloration efficiency, color contrast, and cycle life. Spectroscopic investigations have been carried out using Raman and UV–vis to establish a bias induced redox switching based mechanism for the reported improvement in the performance. The device shows switching between magenta (OFF) and transparent states (ON) with a very small bias of ±1 V, an optical modulation of 50% and an absorbance switching contrast of 91%. An enhanced stability for a duration of longer than 2500 s and 250 cycles has been reported with an ultrafast response of few hundred milliseconds. A very high coloration efficiency of 321 cm2/C is achieved, making the proposed device one of the best reported P3HT-based electrochromic devices.

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