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Geminate recombination in organic photovoltaic blend PCDTBT/PC71BM studied by out-of-phase electron spin echo spectroscopy. / Beletskaya, E. A.; Lukina, E. A.; Uvarov, M. N. и др.

в: Journal of Chemical Physics, Том 152, № 4, 044706, 31.01.2020.

Результаты исследований: Научные публикации в периодических изданияхстатьяРецензирование

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Beletskaya EA, Lukina EA, Uvarov MN, Popov AA, Kulik LV. Geminate recombination in organic photovoltaic blend PCDTBT/PC71BM studied by out-of-phase electron spin echo spectroscopy. Journal of Chemical Physics. 2020 янв. 31;152(4):044706. doi: 10.1063/1.5131855

Author

Beletskaya, E. A. ; Lukina, E. A. ; Uvarov, M. N. и др. / Geminate recombination in organic photovoltaic blend PCDTBT/PC71BM studied by out-of-phase electron spin echo spectroscopy. в: Journal of Chemical Physics. 2020 ; Том 152, № 4.

BibTeX

@article{ac0e14154bbb4917b0fa49cfb929a2c5,
title = "Geminate recombination in organic photovoltaic blend PCDTBT/PC71BM studied by out-of-phase electron spin echo spectroscopy",
abstract = "The key process in organic solar cell operation is charge separation under light illumination. Due to the low dielectric constant of organic materials, the Coulomb attraction energy within the interfacial charge-transfer state (CTS) is larger than the thermal energy. Understanding the mechanism of charge separation at the organic donor/acceptor interface still remains a challenge and requires knowledge of the CTS temporal evolution. To address this problem, the CTS in the benchmark photovoltaic blend PCDTBT/PC71BM was studied by the out-of-phase Electron Spin Echo (ESE). The protocol for determining the CTS geminate recombination rate for certain electron-hole distances was developed. Simulating the out-of-phase ESE trace for the CTS in the PCDTBT/PC71BM blend allows precise determination of the electron-hole distance distribution function and its evolution with the increase in the delay after the laser flash. Distances of charge separation up to 6 nm were detected upon thermalization at a temperature of 20 K. Assuming the exponential decay of the recombination rate, the attenuation factor β = 0.08 {\AA}-1 is estimated for the PCDTBT/PC71BM blend. Such a low attenuation factor is probably caused by a high degree of hole delocalization along the PCDTBT chain.",
keywords = "CORRELATED RADICAL PAIRS, PHOTOSYNTHETIC REACTION CENTERS, INDUCED CHARGE SEPARATION, DOUBLE-QUANTUM COHERENCE, LONG-RANGE ELECTRON, DISTANCE DETERMINATION, P3HT/PC70BM COMPOSITE, PHOTOSYSTEM-I, DYNAMICS, EPR",
author = "Beletskaya, {E. A.} and Lukina, {E. A.} and Uvarov, {M. N.} and Popov, {A. A.} and Kulik, {L. V.}",
year = "2020",
month = jan,
day = "31",
doi = "10.1063/1.5131855",
language = "English",
volume = "152",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics",
number = "4",

}

RIS

TY - JOUR

T1 - Geminate recombination in organic photovoltaic blend PCDTBT/PC71BM studied by out-of-phase electron spin echo spectroscopy

AU - Beletskaya, E. A.

AU - Lukina, E. A.

AU - Uvarov, M. N.

AU - Popov, A. A.

AU - Kulik, L. V.

PY - 2020/1/31

Y1 - 2020/1/31

N2 - The key process in organic solar cell operation is charge separation under light illumination. Due to the low dielectric constant of organic materials, the Coulomb attraction energy within the interfacial charge-transfer state (CTS) is larger than the thermal energy. Understanding the mechanism of charge separation at the organic donor/acceptor interface still remains a challenge and requires knowledge of the CTS temporal evolution. To address this problem, the CTS in the benchmark photovoltaic blend PCDTBT/PC71BM was studied by the out-of-phase Electron Spin Echo (ESE). The protocol for determining the CTS geminate recombination rate for certain electron-hole distances was developed. Simulating the out-of-phase ESE trace for the CTS in the PCDTBT/PC71BM blend allows precise determination of the electron-hole distance distribution function and its evolution with the increase in the delay after the laser flash. Distances of charge separation up to 6 nm were detected upon thermalization at a temperature of 20 K. Assuming the exponential decay of the recombination rate, the attenuation factor β = 0.08 Å-1 is estimated for the PCDTBT/PC71BM blend. Such a low attenuation factor is probably caused by a high degree of hole delocalization along the PCDTBT chain.

AB - The key process in organic solar cell operation is charge separation under light illumination. Due to the low dielectric constant of organic materials, the Coulomb attraction energy within the interfacial charge-transfer state (CTS) is larger than the thermal energy. Understanding the mechanism of charge separation at the organic donor/acceptor interface still remains a challenge and requires knowledge of the CTS temporal evolution. To address this problem, the CTS in the benchmark photovoltaic blend PCDTBT/PC71BM was studied by the out-of-phase Electron Spin Echo (ESE). The protocol for determining the CTS geminate recombination rate for certain electron-hole distances was developed. Simulating the out-of-phase ESE trace for the CTS in the PCDTBT/PC71BM blend allows precise determination of the electron-hole distance distribution function and its evolution with the increase in the delay after the laser flash. Distances of charge separation up to 6 nm were detected upon thermalization at a temperature of 20 K. Assuming the exponential decay of the recombination rate, the attenuation factor β = 0.08 Å-1 is estimated for the PCDTBT/PC71BM blend. Such a low attenuation factor is probably caused by a high degree of hole delocalization along the PCDTBT chain.

KW - CORRELATED RADICAL PAIRS

KW - PHOTOSYNTHETIC REACTION CENTERS

KW - INDUCED CHARGE SEPARATION

KW - DOUBLE-QUANTUM COHERENCE

KW - LONG-RANGE ELECTRON

KW - DISTANCE DETERMINATION

KW - P3HT/PC70BM COMPOSITE

KW - PHOTOSYSTEM-I

KW - DYNAMICS

KW - EPR

UR - http://www.scopus.com/inward/record.url?scp=85078681425&partnerID=8YFLogxK

U2 - 10.1063/1.5131855

DO - 10.1063/1.5131855

M3 - Article

C2 - 32007084

AN - SCOPUS:85078681425

VL - 152

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 4

M1 - 044706

ER -

ID: 23262573