High Thermoelectric Power Factor of a Diketopyrrolopyrrole-Based Low Bandgap Polymer via Finely Tuned Doping Engineering

Jung, In Hwan; Hong, Cheon Taek; Lee, Un Hak; Kang, Young Hun; Jang, Kwang Suk; Cho, Song Yun

doi:10.1038/srep44704

Cited by 99 publications

(59 citation statements)

References 39 publications

(86 reference statements)

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“…Doping of PEDOT by PSS is a well-documented phenomenon and thus, a similar doping effect can be expected after formation of the ionic complex between P3HTN and PSS [32]. When doped, the absorption of P3HT undergoes a bathochromic shift, which is also associated with the appearance of a new absorption shoulder between 700 and 1000 nm [33,34]. We observe a similar appearance of a new shoulder between 700 and 1000 nm in addition to the bathchromic shift in the P3HTN absorption.…”

Section: Resultssupporting

confidence: 68%

Water-Processed Organic Solar Cells with Open-Circuit Voltages Exceeding 1.3V

2020

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Conjugated polyelectrolytes are commonly employed as interlayers to modify organic solar cell (OSC) electrode work functions but their use as an electron donor in water-processed OSC active layers has barely been investigated. Here, we demonstrate that poly[3-(6’-N,N,N-trimethyl ammonium)-hexylthiophene] bromide (P3HTN) can be employed as an electron donor combined with a water-soluble fullerene (PEG-C60) into eco-friendly active layers deposited from aqueous solutions. Spin-coating a poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) layer prior to the P3HTN:PEG-C60 active layer deposition considerably increases the open-circuit voltage (Voc) of the OSCs to values above 1.3 V. Along with this enhanced Voc, the OSCs fabricated with the PEDOT:PSS interlayers exhibit 10-fold and 5-fold increases in short-circuit current density (Jsc) with respect to those employing bare indium tin oxide (ITO) and molybdenum trioxide coated ITO anodes, respectively. These findings suggest that the enhanced Jsc and Voc in the water-processed OSCs using the PEDOT:PSS interlayer cannot be solely ascribed to a better hole collection but rather to ion exchanges taking place between PEDOT:PSS and P3HTN. We investigate the optoelectronic properties of the newly formed polyelectrolytes using absorption and photoelectron spectroscopy combined with hole transport measurements to elucidate the enhanced photovoltaic parameters obtained in the OSCs prepared with PEDOT:PSS and P3HTN.

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Section: Resultssupporting

confidence: 68%

Water-Processed Organic Solar Cells with Open-Circuit Voltages Exceeding 1.3V

2020

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“…25 , and ( c ) P3HT sample from Ref. 60 , showing good agreement across multiple data sets. We plot two curves (solid and dashed lines) on the top and botton of the experimental data to show that the values would fall between these two extremes and account for possible error bars.…”

Section: Resultsmentioning

confidence: 71%

Effects of Disorder on Thermoelectric Properties of Semiconducting Polymers

Upadhyaya

Boyle

Venkataraman

et al. 2019

Sci Rep

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Organic materials have attracted recent interest as thermoelectric (TE) converters due to their low cost and ease of fabrication. We examine the effects of disorder on the TE properties of semiconducting polymers based on the Gaussian disorder model (GDM) for site energies while employing Pauli’s master equation approach to model hopping between localized sites. Our model is in good agreement with experimental results and a useful tool to study hopping transport. We show that stronger overlap between sites can improve the electrical conductivity without adversely affecting the Seebeck coefficient. We find that positional disorder aids the formation of new conduction paths with an increased probability of carriers in high energy sites, leading to an increase in electrical conductivity while leaving the Seebeck unchanged. On the other hand, energetic disorder leads to increased energy gaps between sites, hindering transport. This adversely affects conductivity while only slightly increasing Seebeck and results in lower TE power factors. Furthermore, positional correlation primarily affects conductivity, while correlation in site energies has no effect on TE properties of polymers. Our results also show that the Lorenz number increases with Seebeck coefficient, largely deviating from the Sommerfeld value, in agreement with experiments and in contrast to band conductors. We conclude that reducing energetic disorder and positional correlation, while increasing positional disorder can lead to higher TE power factors.

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“…In the last decades, the addition of conducting coating materials and secondary phases such as mixed ionic–electronic conducting organic materials (e.g., conducting polymers), working as linkers between inorganic nanomaterials, has attracted a lot of attention (Judeinstein and Sanchez, 1996 ; Gómez-Romero and Lira-Cantú, 1997 ; Guizard et al, 2001 ; Le Bideau et al, 2011 ). It is well-accepted that electronic conducting organic polymers, usually called conjugated polymers, are semiconductors in nature and that the most popular cases such as poly(pyrrole) (Ppy) (Della Santa et al, 1997 ), poly(aniline) (PANI) (Zhang K. et al, 2012 a; Chatterjee et al, 2013 ; Zhang Q. et al, 2013 a; Roussel et al, 2015 ), poly(ethylenedioxythiophene) (PEDOT) (Crispin et al, 2006 ; Udo et al, 2009 ; Takano et al, 2012 ; Kim et al, 2013 ; Mengistie et al, 2013 , 2015 ; Lee et al, 2014 ; Kumar et al, 2016 ; Zia Ullah et al, 2016 ), and poly(3-hexylthiophene) (P3HT) (Zhang Q. et al, 2012 ; Pingel and Neher, 2013 ; Glaudell et al, 2015 ; Jacobs et al, 2016 ; Qu et al, 2016 ; Jung et al, 2017 ; Wang W. et al, 2017 ; Lim et al, 2018 ) generally exhibit an electronic donor behavior. In this case, the most common procedure to enhance the electronic conduction, where charge carriers will be mostly holes rather than electrons, is by doping these polymers with electronic acceptor species (p-type doping) such as halide and sulfonate salts, yielding a decrease in the electronic band gap and an increase of the electronic conductivity up to σ e ~ 10 −1 -10 3 S cm −1 values (Della Santa et al, 1997 ; Crispin et al, 2006 ; Udo et al, 2009 ; Takano et al, 2012 ; Zhang K. et al, 2012 ; Zhang Q. et al, 2012 , 2013 ; Chatterjee et al, 2013 ; Kim et al, 2013 ; Mengistie et al, 2013 , 2015 ; Pingel and Neher, 2013 ; Lee et al, 2014 ; Glaudell et al, 2015 ; Roussel et al, 2015 ; Jacobs et al, 2016 ; Kumar et al, 2016 ; Qu et al, 2016...…”

Section: Introductionmentioning

confidence: 99%

Mini-Review: Mixed Ionic–Electronic Charge Carrier Localization and Transport in Hybrid Organic–Inorganic Nanomaterials

et al. 2020

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In this mini-review, a comprehensive discussion on the state of the art of hybrid organic-inorganic mixed ionic-electronic conductors (hOI-MIECs) is given, focusing on conducting polymer nanocomposites comprising inorganic nanoparticles ranging from ceramic-in-polymer to polymer-in-ceramic concentration regimes. First, a brief discussion on fundamental aspects of mixed ionic-electronic transport phenomena considering the charge carrier transport at bulk regions together with the effect of the organic-inorganic interphase of hybrid nanocomposites is presented. We also make a recount of updated instrumentation techniques to characterize structure, microstructure, chemical composition, and mixed ionic-electronic transport with special focus on those relevant for hOI-MIECs. Raman imaging and impedance spectroscopy instrumentation techniques are particularly discussed as relatively simple and versatile tools to study the charge carrier localization and transport at different regions of hOI-MIECs including both bulk and interphase regions to shed some light on the mixed ionic-electronic transport mechanism. In addition, we will also refer to different device assembly configurations and in situ/operando measurements experiments to analyze mixed ionic-electronic conduction phenomena for different specific applications. Finally, we will also review the broad range of promising applications of hOI-MIECs, mainly in the field of energy storage and conversion, but also in the emerging field of electronics and bioelectronics.

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High Thermoelectric Power Factor of a Diketopyrrolopyrrole-Based Low Bandgap Polymer via Finely Tuned Doping Engineering

Cited by 99 publications

References 39 publications

Water-Processed Organic Solar Cells with Open-Circuit Voltages Exceeding 1.3V

Water-Processed Organic Solar Cells with Open-Circuit Voltages Exceeding 1.3V

Effects of Disorder on Thermoelectric Properties of Semiconducting Polymers

Mini-Review: Mixed Ionic–Electronic Charge Carrier Localization and Transport in Hybrid Organic–Inorganic Nanomaterials

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