2017
DOI: 10.1002/adma.201700930
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Polar Side Chains Enhance Processability, Electrical Conductivity, and Thermal Stability of a Molecularly p‐Doped Polythiophene

Abstract: Molecular doping of organic semiconductors is critical for optimizing a range of optoelectronic devices such as field‐effect transistors, solar cells, and thermoelectric generators. However, many dopant:polymer pairs suffer from poor solubility in common organic solvents, which leads to a suboptimal solid‐state nanostructure and hence low electrical conductivity. A further drawback is the poor thermal stability through sublimation of the dopant. The use of oligo ethylene glycol side chains is demonstrated to s… Show more

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Cited by 205 publications
(322 citation statements)
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“…[39] Using blade coating as the optimized casting method for PE 2 , various dopants were then tested (via solution doping for the same time period) and the thermoelectric properties were compared, as shown in Figure 2. [9,10,13,15] Once AgPF 6 was chosen as the best of this set of dopants for generating high conductivity PE 2 films, the final optimization was to vary the doping level by changing the dopant concentration and doping time. Iron(III) and Ag(I) based dopants were then investigated due to their relatively low cost, commercial availability, and previous use in doping conjugated polymer films to achieve high σ values.…”
Section: Evaluation Of Pe 2 As a Thermoelectric Materialsmentioning
confidence: 99%
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“…[39] Using blade coating as the optimized casting method for PE 2 , various dopants were then tested (via solution doping for the same time period) and the thermoelectric properties were compared, as shown in Figure 2. [9,10,13,15] Once AgPF 6 was chosen as the best of this set of dopants for generating high conductivity PE 2 films, the final optimization was to vary the doping level by changing the dopant concentration and doping time. Iron(III) and Ag(I) based dopants were then investigated due to their relatively low cost, commercial availability, and previous use in doping conjugated polymer films to achieve high σ values.…”
Section: Evaluation Of Pe 2 As a Thermoelectric Materialsmentioning
confidence: 99%
“…[5,6] Recently, conductivity values of ≈10-350 S cm −1 have been reported [7][8][9][10][11][12] for charge neutral conjugated polymers (soluble in organic solvents) with film microstructures that favor high charge carrier mobilities that were subsequently oxidatively doped in solution to yield films with long range order. [16,17] More readily doped materials including a glycolated polythiophene [15] and an alkylated bithiophene-alt-biEDOT polymer [10] (both doped with F 4 TCNQ) were reported with σ values of 100 and 140 S cm −1 , respectively. [9,11,[13][14][15] Beyond this, the crystalline domains in the many of these materials complicate doping.…”
Section: Introductionmentioning
confidence: 99%
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“…4). 6,11,17,[28][29][30][31][32][33][34][35][36][37] The variation in Seebeck coefficient with electrical conductivity follows the empirical trend described by eqn (2) (Fig. 4, top).…”
Section: à3mentioning
confidence: 99%
“…In general, the doping efficiency is low. A high molecular doping ratio (MDR) per monomer unit is required, typically between 5 and 30%, to achieve sufficient doping effects . The high concentration of impurities and the charged species in the polymer matrix can cause defects, distortion or aggregation, which disturb the self‐assembly behavior.…”
Section: Introductionmentioning
confidence: 99%