Side-chain engineering plays a significant role in the design of conjugated materials. In this work, a series of conjugated polymers PBDB-T-R with functionalized groups at the end of side units were developed as elect...Side-chain engineering plays a significant role in the design of conjugated materials. In this work, a series of conjugated polymers PBDB-T-R with functionalized groups at the end of side units were developed as electron donor for organic solar cells(OSCs). The donor polymers PBDB-T-I and PBDB-T-OAc with iodine and acetate end groups exhibited similar absorption and energy levels, but showed much improved PCEs in OSCs compared to the polymer PBDB-T-H without substitutions at the end groups. Additionally, we found that PBDB-T-I and PBDB-T-OAc based cells exhibited optimized performance when using chloroform as solution-processed solvent without any additives. These results indicate that these conjugated polymers can act as self-additive to fabricate photoactive layers via solution process in OSCs.展开更多
Benzothiadiazole(BT)is an electron-deficient unit with fused aromatic core,which can be used to construct conjugated polymers for application in organic solar cells(OSCs).In the past twenty years,huge numbers of conju...Benzothiadiazole(BT)is an electron-deficient unit with fused aromatic core,which can be used to construct conjugated polymers for application in organic solar cells(OSCs).In the past twenty years,huge numbers of conjugated polymers based on BT unit have been developed,focusing on the backbone engineering(such as by using different copolymerized building blocks),side chain engineering(such as by using linear or branch side units),using heteroatoms(such as F,O and S atoms,and CN group),etc.These modifications enable BT-polymers to exhibit distinct absorption spectra(with onset varied from 600 nm to 1000 nm),different frontier energy levels and crystallinities.As a consequence,BT-polymers have gained much attention in recent years,and can be simultaneously used as electron donor and electron acceptor in OSCs,providing the power conversion efficiencies(PCEs)over 18%and 14%in non-fullerene and all-polymer OSCs.In this article,we provide an overview of BT-polymers for OSCs,from donor to acceptor,via selecting some typical BT-polymers in different periods.We hope that the summary in this article can invoke the interest to study the BT-polymers toward high performance OSCs,especially with thick active layers that can be potentially used in large-area devices.展开更多
基金financially supported by the Ministry of Science and Technology(Nos.2018YFA0208504 and 2017YFA0204702)the National Natural Science Foundation of China(Nos.51773207,21574138,and 21905018)of China+1 种基金further supported by Fundamental Research Funds for the Central Universities(No.XK1802-2)Jiangxi Provincial Department of Science and Technology(No.20192ACB20009)。
文摘Side-chain engineering plays a significant role in the design of conjugated materials. In this work, a series of conjugated polymers PBDB-T-R with functionalized groups at the end of side units were developed as electron donor for organic solar cells(OSCs). The donor polymers PBDB-T-I and PBDB-T-OAc with iodine and acetate end groups exhibited similar absorption and energy levels, but showed much improved PCEs in OSCs compared to the polymer PBDB-T-H without substitutions at the end groups. Additionally, we found that PBDB-T-I and PBDB-T-OAc based cells exhibited optimized performance when using chloroform as solution-processed solvent without any additives. These results indicate that these conjugated polymers can act as self-additive to fabricate photoactive layers via solution process in OSCs.
基金financially supported by the Ministry of Science and Technology(Nos.2018YFA0208504 and 2017YFA0204702)the National Natural Science Foundation of China(Nos.51773207,52073016,and 21905018)+2 种基金supported by Fundamental Research Funds for the Central Universities(No.XK1802-2)Jiangxi Provincial Department of Science and Technology(No.20192ACB20009)the Natural Science Foundation of Hebei Province(No.B2020201032)。
文摘Benzothiadiazole(BT)is an electron-deficient unit with fused aromatic core,which can be used to construct conjugated polymers for application in organic solar cells(OSCs).In the past twenty years,huge numbers of conjugated polymers based on BT unit have been developed,focusing on the backbone engineering(such as by using different copolymerized building blocks),side chain engineering(such as by using linear or branch side units),using heteroatoms(such as F,O and S atoms,and CN group),etc.These modifications enable BT-polymers to exhibit distinct absorption spectra(with onset varied from 600 nm to 1000 nm),different frontier energy levels and crystallinities.As a consequence,BT-polymers have gained much attention in recent years,and can be simultaneously used as electron donor and electron acceptor in OSCs,providing the power conversion efficiencies(PCEs)over 18%and 14%in non-fullerene and all-polymer OSCs.In this article,we provide an overview of BT-polymers for OSCs,from donor to acceptor,via selecting some typical BT-polymers in different periods.We hope that the summary in this article can invoke the interest to study the BT-polymers toward high performance OSCs,especially with thick active layers that can be potentially used in large-area devices.
