Thermo-optical properties of conducted polythiophene polymer films used in electroluminescent devices

Jaglarz, Janusz; Nosidlak, Natalia; Wolska, N.

doi:10.1007/s11082-016-0649-0

Cited by 10 publications

(12 citation statements)

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“…The temperature dependence of refractive index is described using the thermo-optic coefficient ( TOC ), which is the derivative of the refractive index upon temperature dn / dT [8,24,25,39]. According to Prod’homme’s theory [40], the temperature variation of the refractive indices n results from the change in polarizability of the electron cloud and the density of the material changing with the temperature [41].…”

Section: Methodsmentioning

confidence: 99%

“…The effectiveness of semiconductive polymers used as LED or PV devices depends on their optical parameters, especially on the refractive index ( n ), the extinction coefficient ( k ), and the optical gap ( E g ) [ 8 , 9 , 10 ]. The optoelectronic properties of π conjugated polymers are a function of their chemical structure, the spatial arrangement of polymeric chains, and the film morphology [ 1 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…The most sensitive optical method allowing the determination of the optical parameters of the films and their thickness is spectroscopic ellipsometry (SE). The SE allows the determination of the most important quantities of the electronic structure of polymer semiconductors, carried out in the widest possible spectral range [ 8 , 12 , 22 ]. For layers with thickness less than 200 nm, ellipsometric techniques give the most reliable results [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…The key parameter that describes the results of the study of optical qualities depending on the temperature is the thermo-optic coefficient ( TOC )—a parameter which is not especially popular in the works of experts in the field. The authors of this article previously described the thermo-optical qualities of clean layers of P3HT and P3OT, and are refer to their results in this paper [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Thermal Dependence of Optical Parameters of Thin Polythiophene Films Blended with PCBM

2018

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The main purpose of this work is to show the thermal dependence of the refractive and extinction indices of conjugated polymer films used in optoelectronics devices. Herein, we present the results of optical investigations performed for the following polymers: poly(3-hexylthiophene) (P3HT), poly(3-octylthiophene) (P3OT), and their blends with [6,6]-phenyl C61 butyric acid methyl ester (PCBM). For our analysis, we chose well-known polythiophenes such P3HT and P3OT, often used in photovoltaic cells. Our addition of PCMB to the polythiophenes allows their conversion efficiency to be increased. This paper presents the results of our investigation determining the spectral dispersion of optical constants in a wavelength range of 190–1700 nm by using spectroscopic ellipsometry (SE). Furthermore, we show the temperature dependence of the refractive indices of polythiophene films for a heating and a cooling process in the temperature range 25–130 °C. Additionally, thermo-optic coefficients and an optical gap were established and are presented in the paper, followed by a discussion on the conditions of the thermal stability of polythiophene blends and reversibility issues in thermal processes. Our paper presents a new and fresh analysis of depolarization beams after their reflection from the studied films. The paper presents the results of thermo-optical studies of polymer blends which have not been included in previously published works.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal Dependence of Optical Parameters of Thin Polythiophene Films Blended with PCBM

2018

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“…The correct determination of these physical properties plays a decisive role in improving their parameters, which, in turn, determines the thermal durability and performance of the final devices. In organic optoelectronics, the most widely studied and used organic materials are semiconducting poly (3-hexylthiophene) (P3HT) [ 6 , 7 , 8 , 9 , 10 ] and its fullerene derivative, [ 6 , 6 ]-phenyl-C 61 -butyric acid methyl ester (PC60BM) [ 11 , 12 , 13 , 14 , 15 ]. Films constructed with blends of both compounds [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ] are widely used as active layers in OPV devices [ 23 , 24 , 25 ].…”

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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Chemical Design of Organic Interface Modifiers for Highly Efficient and Stable Perovskite Solar Cells

Kim

Zhu

2023

Advanced Energy Materials

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Perovskite solar cells (PSCs) have demonstrated rapid progress in their power conversion efficiencies (PCEs)—from 3.8% in 2009 to 25.7% in 2022—and they have received considerable attention as a promising future photovoltaic (PV) technology. However, the operational stability of PSCs is still inadequate to satisfy the standards for commercial applications. Interface engineering has become one of the most important strategies to push PSCs’ efficiency and stability for practical use. Among the various interface engineering approaches, organic interface modifiers (OIMs) have been frequently used by the PSC field to address the issues limiting PSC stability at high efficiency levels. In this perspective, the chemical structures of state‐of‐the‐art OIMs are discussed, and their characteristics are reviewed, as well as the impact on device performance associated with key device interfaces (e.g., metal oxide/perovskite and organic transport layer/perovskite interfaces) from a chemical and materials engineering point of view is discussed. Design considerations and the authors' perspective are discussed, on the basis of representative literature examples, for building new, customized organic OIMs to further improve PSC efficiency and stability toward commercialization.

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Thermo-optical properties of conducted polythiophene polymer films used in electroluminescent devices

Cited by 10 publications

References 9 publications

Thermal Dependence of Optical Parameters of Thin Polythiophene Films Blended with PCBM

Thermal Dependence of Optical Parameters of Thin Polythiophene Films Blended with PCBM

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

Chemical Design of Organic Interface Modifiers for Highly Efficient and Stable Perovskite Solar Cells

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