TY - JOUR
T1 - Effect of oligothiophene π-bridge length in D-π-A star-shaped small molecules on properties and photovoltaic performance in single-component and bulk heterojunction organic solar cells and photodetectors
AU - Luponosov, Yuriy N.
AU - Solodukhin, Alexander N.
AU - Mannanov, Artur L.
AU - Savchenko, Petr S.
AU - Raul, Benedito A.L.
AU - Peregudova, Svetlana M.
AU - Surin, Nikolay M.
AU - Bakirov, Artem V.
AU - Shcherbina, Maxim A.
AU - Chvalun, Sergei N.
AU - Pshenichnikov, Maxim S.
AU - Paraschuk, Dmitry Yu
AU - Ponomarenko, Sergey A.
N1 - Funding Information:
The work was supported by the Russian Science Foundation (grant number 19-73-30028 ). B.A.L.R. and M.S.P. acknowledge funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement № 722651 (SEPOMO) . NMR and UV–vis absorption and luminescence spectra were recorded using the equipment of Collaborative Access Center ‘Center for Polymer Research’ of the Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences with the financial support from the Ministry of Science and Higher Education of the Russian Federation (Contract 0071-2021-0005 ). The work on solar cells was performed using the equipment purchased under the Lomonosov Moscow State University Program of Development. B.A.L.R. and M.S.P. thank F. de Haan for general laboratory assistance and Sylvia Rousseva for preparing the neat and mixed films for time-resolved photoluminescence measurements.
Funding Information:
The work was supported by the Russian Science Foundation (grant number 19-73-30028). B.A.L.R. and M.S.P. acknowledge funding from the European Union's Horizon 2020 research and innovation program under the Marie Sk?odowska-Curie grant agreement ? 722651 (SEPOMO). NMR and UV?vis absorption and luminescence spectra were recorded using the equipment of Collaborative Access Center ?Center for Polymer Research? of the Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences with the financial support from the Ministry of Science and Higher Education of the Russian Federation (Contract 0071-2021-0005). The work on solar cells was performed using the equipment purchased under the Lomonosov Moscow State University Program of Development. B.A.L.R. and M.S.P. thank F. de Haan for general laboratory assistance and Sylvia Rousseva for preparing the neat and mixed films for time-resolved photoluminescence measurements.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/12
Y1 - 2021/12
N2 - Donor-acceptor molecules with thiophene fragments as the π-bridge represent a promising class of materials for organic photovoltaics especially in single-component (SC) organic solar cells (OSCs) and other related applications. However, the effect of the oligothiophene π-bridge length on physicochemical properties, photophysics, charge transport, and photovoltaic performance of these materials has not been thoroughly addressed. Here, we report on the synthesis and comprehensive investigation of the series of star-shaped donor-acceptor molecules (0T–4T) with triphenylamine as a donor core linked through an oligothiophene π-bridge of variable length to the terminal hexyl-dicyanovinyl electron-withdrawing groups. We found that variation of the π-bridge length from 0 to 4 thiophene units strongly impacts their properties such as the solubility, highest occupied molecular orbital energy, optical absorption and photophysics, film morphology, phase behavior, and molecular packing as well as the charge carrier mobility. The performance of the SC and bulk heterojunction OSCs and photodetectors is comprehensively studied and compared. The results obtained provide insight into how to fine-tune and predict properties and photovoltaic performance of small molecules for organic solar cells and photodetectors.
AB - Donor-acceptor molecules with thiophene fragments as the π-bridge represent a promising class of materials for organic photovoltaics especially in single-component (SC) organic solar cells (OSCs) and other related applications. However, the effect of the oligothiophene π-bridge length on physicochemical properties, photophysics, charge transport, and photovoltaic performance of these materials has not been thoroughly addressed. Here, we report on the synthesis and comprehensive investigation of the series of star-shaped donor-acceptor molecules (0T–4T) with triphenylamine as a donor core linked through an oligothiophene π-bridge of variable length to the terminal hexyl-dicyanovinyl electron-withdrawing groups. We found that variation of the π-bridge length from 0 to 4 thiophene units strongly impacts their properties such as the solubility, highest occupied molecular orbital energy, optical absorption and photophysics, film morphology, phase behavior, and molecular packing as well as the charge carrier mobility. The performance of the SC and bulk heterojunction OSCs and photodetectors is comprehensively studied and compared. The results obtained provide insight into how to fine-tune and predict properties and photovoltaic performance of small molecules for organic solar cells and photodetectors.
KW - Alkyl dicyanovinyl group
KW - Donor-acceptor triarylamines
KW - Exciton diffusion
KW - Intramolecular charge transfer
KW - Photoluminescence
KW - Ultrafast spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85118257941&partnerID=8YFLogxK
U2 - 10.1016/j.mtener.2021.100863
DO - 10.1016/j.mtener.2021.100863
M3 - Article
AN - SCOPUS:85118257941
SN - 2468-6069
VL - 22
JO - Materials Today Energy
JF - Materials Today Energy
M1 - 100863
ER -