Synthesis and Characterization of Thienoquinoline-Based Conjugated Polymer Donors for Organic Photovoltaics
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초록
내용
In this study, new electron accepting building block based on thienoquinolinone (TQO), which consisted of thiophene as spacer between two TQO units, was synthesized to resolve steric hindrance of bithienoquinolinone. The synthesized electron accepting builiding block was polymerized with benzodithophene (BDT) or fluorinated BDT via Stille polymerization to give PBDT-biTQO and PFBDT-biTQO. Absorption spectra of the synthesized polymers showed below 600 nm with wide bandgap. PFBDT-biTQO showed lower-lying highest occupied molecular orbital energy level that that of PBDT-biTQO owing to fluorine effect. Non-fullerene based inverted devices, which consisted of indium-tin-oxide/ZnO/polymer:IT-4F/Moo3/Ag, were fabricated to investigate the photovoltaic characteristics. PFBDT-biTQO:IT-4F exhibited the best power conversion efficiency of 8.50 % with high short circuit current.