Enhanced thermoelectric performance of PEDOT:PSS self-supporting thick films through a binary treatment with polyethylene glycol and water

Sun, Zhihui; Meng, Siwei; Li, Weimo; Li, Pengcheng; Zhang, Yunhe; Yao, Hongyan; Guan, Shaokang

doi:10.1016/j.polymer.2020.122328

Cited by 27 publications

(18 citation statements)

References 59 publications

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“…This delocalizing of charge carriers [2b] was further supported by UV‐Vis–NIR spectra (Figure 4C) that demonstrated a broadening of the absorbance at ∼800 nm that extended into the NIR after treatment. A shorter π‐π stacking distance was confirmed by more defined XRD patterns (Figure S9), which is an important indicator of an ordered structure, mobile charge transport and, potentially, electrical conductivity [9,16] . The removal of insulating PSS chains, conformational change to the remaining PEDOT chains and ordering of PEDOT segments in the film all potentially lead to high conductivity [7c] (Figure 4D).…”

Section: Resultsmentioning

confidence: 81%

“…Very recently, studies [5a,6a–c,8] have reported crystallinity engineering and structural modulation to maximize both the Seebeck coefficient and electrical conductivity of this binary polymer. For example, a water‐soaked PEDOT:PSS film with 4% polyethylene glycol displayed simultaneous increases in electrical conductivity to 1415.7±21.2 S cm −1 and Seebeck coefficient to 20.8±1.5 μV K −1 [9] . Highly conductive (∼2500 S/cm), structure‐ordered PEDOT:PSS with a Seebeck coefficient of 20.6 μV K −1 was obtained after treatment with sulfuric acid for a week [5a] .…”

Section: Introductionmentioning

confidence: 99%

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Structural modulation induced by cobalt‐based ionic liquids for enhanced thermoelectric transport in PEDOT:PSS

Sha

et al. 2021

Chemistry An Asian Journal

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Poly(3,4ethylenedioxythiophene):poly(4‐styrenesulfonate) (PEDOT:PSS) has been intensively studied for its thermoelectric applications. Structural modulation to improve crystalline ordering, chain conformation and film morphology is a promising way to decouple the trade‐off between conductivity and Seebeck coefficient and thus improve the thermoelectric power factor. Post treatment with ionic liquid ([CoCl2 ⋅ 6H2O]:[ChCl]) bearing cobalt‐containing anions resulted in a remarkable enhancement of the power factor to 76.8 μW m−1 K−2. This IL combines the influence of a high‐boiling polar organic solvent and diffusing ions. A high σ mainly resulted from the efficient removal of PSS chains, ordering of the structure and delocalization of bipoloran‐dominant transport after conformational change. The increase in S was not due to dedoping of PEDOT chains, but rather the sharp feature of the density of states at the Fermi level induced by ion‐exchange with unconventional anions.

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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Structural modulation induced by cobalt‐based ionic liquids for enhanced thermoelectric transport in PEDOT:PSS

Sha

et al. 2021

Chemistry An Asian Journal

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“…[ 64,91 ] Sun et al. [ 92 ] enhanced the TE performance of a self‐supporting thick PEDOT:PSS film though binary treatment with polyethylene glycol and water. The power factor of the treated PEDOT:PSS films was 5000 times higher than that of the pristine films.…”

Section: Fabrication and Design Of Wearable Thermoelectric Generatorsmentioning

confidence: 99%

“…The electrical conductivity of the inherent PEDOT:PSS film is only 0.2 S cm -1 , whereas modified films show a substantial improvement in electrical conductivity (the best values reach 4000 S cm -1 ) through the doping of polar solvents, [87] acids, [88] ionic liquids, [89] organic salts, [90] and reducing reagents. [64,91] Sun et al [92] enhanced the TE performance of a self-supporting thick PEDOT:PSS film though binary treatment with polyethylene glycol and water. The power factor of the treated PEDOT:PSS films was 5000 times higher than that of the pristine films.…”

Section: Organic Thermoelectric Materialsmentioning

confidence: 99%

Wearable Thermoelectric Materials and Devices for Self‐Powered Electronic Systems

et al. 2021

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Because of their readiness and high power bandwidth, batteries are the preeminent source of power supply for portable electronics, but are subject to periodic recharging and replacement. Hence, a key challenge is to design suitable and sustainable power sources for portable electronic devices. Harvesting energy from the human body is suitable for providing consistent and uninterrupted energy for wearable electronic devices. The daily activities of a 68-kg adult can generate over 100 W of power, through breathing, heating, blood transport, and walking. [3] Thus, converting 1% of the power generated by the human body may be enough to support the work of most portable electronics. Various energy-harvesting technologies, such as, triboelectric nanogenerators (TENGs), [4][5][6] piezoelectric nanogenerators, [7] and thermoelectric generators (TEGs), [8] have been developed to convert human energy (from human motion and body heat) into electricity. In line with recent developments in wearable electronics and e-skins, the use of a self-powered direct-current (DC) electric power supplier is inevitable for activating human body-adjustable electronic systems. [9] Among the various energy-autonomous devices, [10] only TEGs can permanently produce DC electric power without complex power managing components, and they are maintenance free. Moreover, solar energy and vibration-based energy harvesters areThe emergence of artificial intelligence and the Internet of Things has led to a growing demand for wearable and maintenance-free power sources. The continual push toward lower operating voltages and power consumption in modern integrated circuits has made the development of devices powered by body heat finally feasible. In this context, thermoelectric (TE) materials have emerged as promising candidates for the effective conversion of body heat into electricity to power wearable devices without being limited by environmental conditions. Driven by rapid advances in processing technology and the performance of TE materials over the past two decades, wearable thermoelectric generators (WTEGs) have gradually become more flexible and stretchable so that they can be used on complex and dynamic surfaces. In this review, the functional materials, processing techniques, and strategies for the device design of different types of WTEGs are comprehensively covered. Wearable self-powered systems based on WTEGs are summarized, including multi-function TE modules, hybrid energy harvesting, and all-in-one energy devices. Challenges in organic TE materials, interfacial engineering, and assessments of device performance are discussed, and suggestions for future developments in the area are provided. This review will promote the rapid implementation of wearable TE materials and devices in self-powered electronic systems.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202102990.

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“…Nowadays, poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is one of the most employed intrinsically conducting polymers on the industrial market [1]. Its success is related to its unique optoelectronic properties [2], high and tunable electrical [3,4] and thermoelectrical properties [5][6][7][8][9], and excellent physicochemical stability [10]. In this way, PEDOT:PSS has been used in applications as low consuming organic light-emitting diodes [11,12] and highly effective perovskite solar cells [13,14], which are being highly demanded for developing a more sustainable and greener future.…”

Section: Introductionmentioning

confidence: 99%

Solvent-structured PEDOT:PSS surfaces: fabrication strategies and nanoscale properties

Sanviti

Mester

Hillenbrand

et al. 2021

Preprint

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We present the preparation of nanostructured conducting PEDOT:PSS thin films by solvent vapor annealing (SVA), using the low boiling point solvent tetrahydrofuran (THF). An Atomic Force Microscopy (AFM) study allowed the observation of distinct nanostructure development as a function of solvent exposure time. Moreover, the nanostructures’ physical properties were evaluated by nanomechanical, nanoelectrical, and nano-FTIR measurements. In this way, we were able to differentiate the local response of the developed phases and to identify their chemical nature. The combination of these techniques allowed to demonstrate that exposure to THF is a facile method to effectively and selectively modify the surface nanostructure of PEDOT:PSS, and thereafter its final properties. Moreover, our nanoscale studies provided evidence about the molecular rearrangements that PEDOT:PSS suffers during nanostructure fabrication, a fundamental fact in order to expand the potential applications of this polymer in thermoelectric and optoelectronic devices.

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Enhanced thermoelectric performance of PEDOT:PSS self-supporting thick films through a binary treatment with polyethylene glycol and water

Cited by 27 publications

References 59 publications

Structural modulation induced by cobalt‐based ionic liquids for enhanced thermoelectric transport in PEDOT:PSS

Structural modulation induced by cobalt‐based ionic liquids for enhanced thermoelectric transport in PEDOT:PSS

Wearable Thermoelectric Materials and Devices for Self‐Powered Electronic Systems

Solvent-structured PEDOT:PSS surfaces: fabrication strategies and nanoscale properties

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