Advanced Materials · 2019 · 361 citations · 46 references
Natural SciencesChemistryMaterials ScienceElectronic MaterialsOrganic ChemistrySemiconductor MaterialsOrganic Electronic MaterialsOrganic SemiconductorsPhotovoltaic DevicesPhotovoltaic MaterialsSolar Cell MaterialsSolar CellsElectron MobilityElectronic Energy LevelsEnergy Conversion EfficiencyOrganic Photovoltaic CellsOrganic Solar CellsPower ConversionPower Conversion EfficiencyShort-circuit Current
Abstract Narrow bandgap n‐type organic semiconductors (n‐OS) have attracted great attention in recent years as acceptors in organic solar cells (OSCs), due to their easily tuned absorption and electronic energy levels in comparison with fullerene acceptors. Herein, a new n‐OS acceptor, Y5, with an electron‐deficient‐core‐based fused structure is designed and synthesized, which exhibits a strong absorption in the 600–900 nm region with an extinction coefficient of 1.24 × 10 5 cm −1 , and an electron mobility of 2.11 × 10 −4 cm 2 V −1 s −1 . By blending Y5 with three types of common medium‐bandgap polymers (J61, PBDB‐T, and TTFQx‐T1) as donors, all devices exhibit high short‐circuit current densities over 20 mA cm −2 . As a result, the power conversion efficiency of the Y5‐based OSCs with J61, TTFQx‐T1, and PBDB‐T reaches 11.0%, 13.1%, and 14.1%, respectively. This indicates that Y5 is a universal and highly efficient n‐OS acceptor for applications in organic solar cells.
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An Electron Acceptor Challenging Fullerenes for Efficient Polymer Solar Cells
Yuze Lin, Jiayu Wang, Zhiguo Zhang et al. · Advanced Materials · 2015 · 4.2K citations
Natural Sciences, Materials Engineering, Materials Science +17