Free radicals in organic semiconductors during photooxidation: Thin films of polymers P3HT and PCDTBT vs small molecules DRCN5T and BTR

Mikhail N. Uvarov; Mikhail S. Plekhanov; Vladimir A. Zinoviev; Vadim V. Yanshole; Matvey V. Fedin; Leonid V. Kulik

doi:10.1016/j.cplett.2020.137647

Free radicals in organic semiconductors during photooxidation: Thin films of polymers P3HT and PCDTBT vs small molecules DRCN5T and BTR

Mikhail N. Uvarov, Mikhail S. Plekhanov, Vladimir A. Zinoviev, Vadim V. Yanshole, Matvey V. Fedin, Leonid V. Kulik

Research output: Contribution to journal › Article › peer-review

Abstract

Photodegradation of thin films of organic semiconducting electron-donor materials P3HT, PCDTBT, DRCN5T and BTR upon illumination with visible light in air was studied. The changes of UV–vis absorption, photoluminescence and EPR spectra were monitored as functions of illumination time. Stable radicals were generated at concentrations that exceed the values of charge carrier density of organic solar cells in the operating conditions. Increase of the radical concentration was observed for P3HT, PCDTBT, DRCN5T. On the contrary, for BTR the radical concentration drops to zero after initial increase. This indicates different photodegradation processes in studied materials.

Original language	English
Article number	137647
Number of pages	6
Journal	Chemical Physics Letters
Volume	754
DOIs	https://doi.org/10.1016/j.cplett.2020.137647
Publication status	Published - Sep 2020

Keywords

Cyano group
Electron paramagnetic resonance
Long-lived radicals
Organic electron-donor materials
Photooxidation
MECHANISM
PERFORMANCE
BEHAVIOR
POLY(3-HEXYLTHIOPHENE)
LIGHT
SPECTROSCOPY
DEGRADATION
DERIVATIVES

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@article{6a71c1a59c9e461fa7986e141994145b,

title = "Free radicals in organic semiconductors during photooxidation: Thin films of polymers P3HT and PCDTBT vs small molecules DRCN5T and BTR",

abstract = "Photodegradation of thin films of organic semiconducting electron-donor materials P3HT, PCDTBT, DRCN5T and BTR upon illumination with visible light in air was studied. The changes of UV–vis absorption, photoluminescence and EPR spectra were monitored as functions of illumination time. Stable radicals were generated at concentrations that exceed the values of charge carrier density of organic solar cells in the operating conditions. Increase of the radical concentration was observed for P3HT, PCDTBT, DRCN5T. On the contrary, for BTR the radical concentration drops to zero after initial increase. This indicates different photodegradation processes in studied materials.",

keywords = "Cyano group, Electron paramagnetic resonance, Long-lived radicals, Organic electron-donor materials, Photooxidation, MECHANISM, PERFORMANCE, BEHAVIOR, POLY(3-HEXYLTHIOPHENE), LIGHT, SPECTROSCOPY, DEGRADATION, DERIVATIVES",

author = "Uvarov, {Mikhail N.} and Plekhanov, {Mikhail S.} and Zinoviev, {Vladimir A.} and Yanshole, {Vadim V.} and Fedin, {Matvey V.} and Kulik, {Leonid V.}",

year = "2020",

month = sep,

doi = "10.1016/j.cplett.2020.137647",

language = "English",

volume = "754",

journal = "Chemical Physics Letters",

issn = "0009-2614",

publisher = "Elsevier",

}

Free radicals in organic semiconductors during photooxidation : Thin films of polymers P3HT and PCDTBT vs small molecules DRCN5T and BTR. / Uvarov, Mikhail N.; Plekhanov, Mikhail S.; Zinoviev, Vladimir A.; Yanshole, Vadim V.; Fedin, Matvey V.; Kulik, Leonid V.

In: Chemical Physics Letters, Vol. 754, 137647, 09.2020.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Free radicals in organic semiconductors during photooxidation

T2 - Thin films of polymers P3HT and PCDTBT vs small molecules DRCN5T and BTR

AU - Uvarov, Mikhail N.

AU - Plekhanov, Mikhail S.

AU - Zinoviev, Vladimir A.

AU - Yanshole, Vadim V.

AU - Fedin, Matvey V.

AU - Kulik, Leonid V.

PY - 2020/9

Y1 - 2020/9

N2 - Photodegradation of thin films of organic semiconducting electron-donor materials P3HT, PCDTBT, DRCN5T and BTR upon illumination with visible light in air was studied. The changes of UV–vis absorption, photoluminescence and EPR spectra were monitored as functions of illumination time. Stable radicals were generated at concentrations that exceed the values of charge carrier density of organic solar cells in the operating conditions. Increase of the radical concentration was observed for P3HT, PCDTBT, DRCN5T. On the contrary, for BTR the radical concentration drops to zero after initial increase. This indicates different photodegradation processes in studied materials.

AB - Photodegradation of thin films of organic semiconducting electron-donor materials P3HT, PCDTBT, DRCN5T and BTR upon illumination with visible light in air was studied. The changes of UV–vis absorption, photoluminescence and EPR spectra were monitored as functions of illumination time. Stable radicals were generated at concentrations that exceed the values of charge carrier density of organic solar cells in the operating conditions. Increase of the radical concentration was observed for P3HT, PCDTBT, DRCN5T. On the contrary, for BTR the radical concentration drops to zero after initial increase. This indicates different photodegradation processes in studied materials.

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KW - Electron paramagnetic resonance

KW - Long-lived radicals

KW - Organic electron-donor materials

KW - Photooxidation

KW - MECHANISM

KW - PERFORMANCE

KW - BEHAVIOR

KW - POLY(3-HEXYLTHIOPHENE)

KW - LIGHT

KW - SPECTROSCOPY

KW - DEGRADATION

KW - DERIVATIVES

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