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Ground- and excited-state characteristics in photovoltaic polymer N2200

As a classical polymer acceptor material, N2200 has received extensive attention and research in the field of polymer solar cells (PSCs). However, the intrinsic properties of ground- and excited-states in N2200, which are critical for the application of N2200 in PSCs, remain poorly understood. In th...

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Autores principales: Wen, Guanzhao, Zou, Xianshao, Hu, Rong, Peng, Jun, Chen, Zhifeng, He, Xiaochuan, Dong, Geng, Zhang, Wei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9033976/
https://www.ncbi.nlm.nih.gov/pubmed/35479889
http://dx.doi.org/10.1039/d1ra01474a
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author Wen, Guanzhao
Zou, Xianshao
Hu, Rong
Peng, Jun
Chen, Zhifeng
He, Xiaochuan
Dong, Geng
Zhang, Wei
author_facet Wen, Guanzhao
Zou, Xianshao
Hu, Rong
Peng, Jun
Chen, Zhifeng
He, Xiaochuan
Dong, Geng
Zhang, Wei
author_sort Wen, Guanzhao
collection PubMed
description As a classical polymer acceptor material, N2200 has received extensive attention and research in the field of polymer solar cells (PSCs). However, the intrinsic properties of ground- and excited-states in N2200, which are critical for the application of N2200 in PSCs, remain poorly understood. In this work, the ground- and excited-state properties of N2200 solution and film were studied by steady-state and time-resolved spectroscopies as well as time-dependent density functional theory (TD-DFT) calculations. The transition mechanism of absorption peaks of N2200 was evaluated through the natural transition orbitals (NTOs) and hole–electron population analysis by TD-DFT. Time-resolved photoluminescence (TRPL) study shows that the lifetimes of singlet excitons in N2200 chlorobenzene solution and film are ∼90 ps and ∼60 ps, respectively. Considering the absolute quantum yield of N2200 film, we deduce that the intrinsic lifetime of singlet exciton can be as long as ∼20 ns. By comparing the TRPL and transient absorption (TA) kinetics, we find that the decay of singlet excitons in N2200 solution is dominated by a fast non-radiative decay process, and the component induced by intersystem crossing is less than 5%. Besides that, the annihilation radius, annihilation rate and diffusion length of singlet excitons in N2200 film were evaluated as 3.6 nm, 2.5 × 10(−9) cm(3) s(−1) and 4.5 nm, respectively. Our work provides comprehensive information on the excited states of N2200, which is helpful for the application of N2200 in all-PSCs.
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spelling pubmed-90339762022-04-26 Ground- and excited-state characteristics in photovoltaic polymer N2200 Wen, Guanzhao Zou, Xianshao Hu, Rong Peng, Jun Chen, Zhifeng He, Xiaochuan Dong, Geng Zhang, Wei RSC Adv Chemistry As a classical polymer acceptor material, N2200 has received extensive attention and research in the field of polymer solar cells (PSCs). However, the intrinsic properties of ground- and excited-states in N2200, which are critical for the application of N2200 in PSCs, remain poorly understood. In this work, the ground- and excited-state properties of N2200 solution and film were studied by steady-state and time-resolved spectroscopies as well as time-dependent density functional theory (TD-DFT) calculations. The transition mechanism of absorption peaks of N2200 was evaluated through the natural transition orbitals (NTOs) and hole–electron population analysis by TD-DFT. Time-resolved photoluminescence (TRPL) study shows that the lifetimes of singlet excitons in N2200 chlorobenzene solution and film are ∼90 ps and ∼60 ps, respectively. Considering the absolute quantum yield of N2200 film, we deduce that the intrinsic lifetime of singlet exciton can be as long as ∼20 ns. By comparing the TRPL and transient absorption (TA) kinetics, we find that the decay of singlet excitons in N2200 solution is dominated by a fast non-radiative decay process, and the component induced by intersystem crossing is less than 5%. Besides that, the annihilation radius, annihilation rate and diffusion length of singlet excitons in N2200 film were evaluated as 3.6 nm, 2.5 × 10(−9) cm(3) s(−1) and 4.5 nm, respectively. Our work provides comprehensive information on the excited states of N2200, which is helpful for the application of N2200 in all-PSCs. The Royal Society of Chemistry 2021-06-14 /pmc/articles/PMC9033976/ /pubmed/35479889 http://dx.doi.org/10.1039/d1ra01474a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Wen, Guanzhao
Zou, Xianshao
Hu, Rong
Peng, Jun
Chen, Zhifeng
He, Xiaochuan
Dong, Geng
Zhang, Wei
Ground- and excited-state characteristics in photovoltaic polymer N2200
title Ground- and excited-state characteristics in photovoltaic polymer N2200
title_full Ground- and excited-state characteristics in photovoltaic polymer N2200
title_fullStr Ground- and excited-state characteristics in photovoltaic polymer N2200
title_full_unstemmed Ground- and excited-state characteristics in photovoltaic polymer N2200
title_short Ground- and excited-state characteristics in photovoltaic polymer N2200
title_sort ground- and excited-state characteristics in photovoltaic polymer n2200
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9033976/
https://www.ncbi.nlm.nih.gov/pubmed/35479889
http://dx.doi.org/10.1039/d1ra01474a
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