Regioisomeric Polymer Semiconductors Based on Cyano-Functionalized Dialkoxybithiophenes: Structure–Property Relationship and Photovoltaic Performance
|Corresponding Author||Sun，Huiliang; Woo，Han Young; Niu，Li; Guo，Xugang|
Cyano substitution is vital to the molecular design of polymer semiconductors toward highly efficient organic solar cells. However, how regioselectivity impacts relevant optoelectronic properties in cyano-substituted bithiophene systems remain poorly understood. Three regioisomeric cyano-functionalized dialkoxybithiophenes BT, BT, and BT with head-to-head, head-to-tail, and tail-to-tail linkage, respectively, were synthesized and characterized in this work. The resulting polymer semiconductors (PBDTBTs) based on these building blocks were prepared accordingly. The regiochemistry and property relationships of PBDTBTs were investigated in detail. The BT moiety has a higher torsional barrier than the analogs BT and BT, and the regiochemistry of dialkoxybithiophenes leads to fine modulation in the optoelectronic properties of these polymers, such as optical absorption, band gap, and energy levels of frontier molecular orbitals. Organic field-effect transistors based on PBDTBT had higher hole mobility (4.4 × 10 cm/(V·s)) than those (ca. 10 cm/(V·s)) of the other two polymer analogs. Significantly different short-circuit current densities and fill factors were obtained in polymer solar cells using PBDTBTs as the electron donors. Such difference was probed in greater detail by performing space-charge-limited current mobility, thin-film morphology, and transient photocurrent/photovoltage characterizations. The findings highlight that the BT unit is a promising building block for the construction of polymer donors for high-performance organic photovoltaic cells. Graphical abstract: [Figure not available: see fulltext.]
|EI Accession Number|
Energy Gap ; Hole Mobility ; Light Absorption ; Molecular Orbitals ; Morphology ; Organic Polymers ; Organic Solar Cells ; Photoelectrochemical Cells
|ESI Classification Code|
Electric Batteries:702.1 ; Solar Cells:702.3 ; Semiconducting Materials:712.1 ; Semiconductor Devices And Integrated Circuits:714.2 ; Light/Optics:741.1 ; Physical Chemistry:801.4 ; Organic Polymers:815.1.1 ; Physical Properties Of Gases, Liquids And Solids:931.2 ; Atomic And Molecular Physics:931.3 ; Materials Science:951
Cited Times [WOS]:0
|Document Type||Journal Article|
|Department||Department of Materials Science and Engineering|
1.Center for Advanced Analytical Science,School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou,510006,China
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangdong,510640,China
4.Department of Chemistry,Korea University,Seoul,136-713,South Korea
|First Author Affilication||Department of Materials Science and Engineering|
|Corresponding Author Affilication||Department of Materials Science and Engineering|
Bai，Qingqing,Huang，Jun,Guo，Han,等. Regioisomeric Polymer Semiconductors Based on Cyano-Functionalized Dialkoxybithiophenes: Structure–Property Relationship and Photovoltaic Performance[J]. Transactions of Tianjin University,2022,28:385-397.
Bai，Qingqing.,Huang，Jun.,Guo，Han.,Ma，Suxiang.,Yang，Jie.,...&Guo，Xugang.(2022).Regioisomeric Polymer Semiconductors Based on Cyano-Functionalized Dialkoxybithiophenes: Structure–Property Relationship and Photovoltaic Performance.Transactions of Tianjin University,28,385-397.
Bai，Qingqing,et al."Regioisomeric Polymer Semiconductors Based on Cyano-Functionalized Dialkoxybithiophenes: Structure–Property Relationship and Photovoltaic Performance".Transactions of Tianjin University 28(2022):385-397.
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