Rapid and Checkable Electrical Post-Treatment Method for Organic Photovoltaic Devices

Park, Sangheon; Seo, Yu-Seong; Shin, Won Suk; Moon, Sang‐Jin; Hwang, Jungseek

doi:10.1038/srep22604

Cited by 11 publications

(7 citation statements)

References 25 publications

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“…The performance of OEDs can be optimized in many ways, for example, by changing the volume composition of the active layer [ 19 , 20 ]. Different methods include the annealing process [ 21 , 22 , 23 ] or the use of different solvents [ 24 ]. Another method of improving the efficiency is the extraction/injection of electron layers and/or holes in the area of their contact with the organic semiconductor [ 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Thermal Transitions and Physical Properties of Semiconducting PDPP4T:PDBPyBT Blend Films

et al. 2022

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This work focuses on the study of thermal and physical properties of thin polymer films based on mixtures of semiconductor polymers. The materials selected for research were poly [2,5-bis(2-octyldodecyl)-pyrrolo [3,4-c]pyrrole-1,4(2H,5H)-dione-3,6-diyl)-alt-(2,2′;5′,2″;5″,2′′′-quater-thiophen-5,5′′′-diyl)]—PDPP4T, a p-type semiconducting polymer, and poly(2,5-bis(2-octyldodecyl)-3,6-di(pyridin-2-yl)-pyrrolo [3,4-c]pyrrole-1,4(2H,5H)-dione-alt-2,2′-bithiophene)—PDBPyBT, a high-mobility n-type polymer. The article describes the influence of the mutual participation of materials on the structure, physical properties and thermal transitions of PDPP4T:PDBPyBT blends. Here, for the first time, we demonstrate the phase diagram for PDPP4T:PDBPyBT blend films, constructed on the basis of variable-temperature spectroscopic ellipsometry and differential scanning calorimetry. Both techniques are complementary to each other, and the obtained results overlap to a large extent. Our research shows that these polymers can be mixed in various proportions to form single-phase mixtures with several thermal transitions, three of which with the lowest characteristic temperatures can be identified as glass transitions. In addition, the RMS roughness value of the PDPP4T:PDBPyBT blended films was lower than that of the pure materials.

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Section: Introductionmentioning

confidence: 99%

An Investigation of the Thermal Transitions and Physical Properties of Semiconducting PDPP4T:PDBPyBT Blend Films

et al. 2022

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“…The maximum reported values of power conversion efficiency of these cells range from 5% to 16–18% [ 31 , 32 , 33 ]. Cell efficiency is affected by many factors, including surface morphology [ 34 , 35 ] or technical parameters of their preparation process [ 36 , 37 , 38 , 39 , 40 ]. It should be noted that the power conversion efficiency of OPV devices can be optimized by heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Thermal Transitions in P3HT:PC60BM Films Based on Electrical Resistance Measurements

et al. 2020

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In this paper, we present research on thermal transition temperature determination in poly (3-hexylthiophene-2,5-diyl) (P3HT), [6,6]-phenyl-C61-butyric acid methyl ester (PC60BM), and their blends, which are materials that are conventionally used in organic optoelectronics. Here, for the first time the results of electrical resistance measurements are explored to detect thermal transitions temperatures, such as glass transition Tg and cold crystallization Tcc of the film. To confirm these results, the variable-temperature spectroscopic ellipsometry studies of the same samples were performed. The thermal transitions temperatures obtained with electrical measurements are well suited to phase diagram, constructed on the basis of ellipsometry in our previous work. The data presented here prove that electrical resistance measurements alone are sufficient for qualitative thermal analysis, which lead to the identification of characteristic temperatures in P3HT:PC60BM films. Based on the carried studies, it can be expected that the determination of thermal transition temperatures by means of electrical resistance measurements will also apply to other semi-conducting polymer films.

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“…The charge injection of polymer light-emitting diodes (PLEDs) is remarkably increased because ionic impurities in the polymer film can be oriented along the direction of the electric field [13]. Since then, EA has been applied to solution-processed organic diodes such as PLEDs, [14] organic photovoltaics (OPVs), [15]- [18] organic light-emitting diodes (OLEDs) with conjugated dendrimers, [19] organic salts, [20] and conducting polymer electrodes [21]. Researchers have suggested that ionic impurities in the organic layer migrate toward the electrodes owing to the electric field, leading to a reduction in the turn-on voltage.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Improved Performance for Organic Rectifying Diodes via Electrical Annealing

et al. 2019

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Electrical annealing (EA) is one of the post treatments to enhance the electrical performances of organic devices. To date, the improvements using EA have only been reported for the solution-processed devices because its mechanism has been known as the alignments of ionic impurities or polymer chains. In this paper, we applied EA to thermally evaporated organic diodes which not have ionic impurities or polymer chains. After EA, the turn-on voltage of the diode was reduced, and the forward-bias current of the diode was increased without changing the reverse-bias current, resulting in an improvement of the cutoff frequency of the rectifier. In addition, we proposed a new mechanism to explain why the EA can be applied to the thermally evaporated organic devices. Based on time-of-flight secondary ion mass spectrometry and impedance spectra, we suggest that this improvement is due to the creation of a MoO 3 :pentacene mixed layer, leading to ease of charge injection. We believe that our finding will be helpful to understand change at the organic/metal interfaces and useful to apply a wide range of organic devices such as organic photovoltaics, organic light-emitting diodes, and organic thin-film transistors.INDEX TERMS Electrical annealing, field-assisted annealing, impedance spectroscopy, organic diodes, organic rectifiers, pentacene diodes.

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Rapid and Checkable Electrical Post-Treatment Method for Organic Photovoltaic Devices

Cited by 11 publications

References 25 publications

An Investigation of the Thermal Transitions and Physical Properties of Semiconducting PDPP4T:PDBPyBT Blend Films

An Investigation of the Thermal Transitions and Physical Properties of Semiconducting PDPP4T:PDBPyBT Blend Films

Thermal Transitions in P3HT:PC60BM Films Based on Electrical Resistance Measurements

Investigation of Improved Performance for Organic Rectifying Diodes via Electrical Annealing

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