An asymmetric small molecule based on thieno[2,3-f]benzofuran for efficient organic solar cells |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;2. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;1. Department of Physics, Engineering Physics and Astronomy, Queen''s University, Kingston, Ontario K7L 3N6, Canada;2. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, PR China;1. Claremont Graduate University, Claremont, CA, USA;2. Pomona College, Claremont, CA, USA;1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | A new asymmetric small molecule, named R3T-TBFO, with 4,8-bis(2-ethylhexyloxy)-substituted thieno[2,3-f]benzofuran (TBF) as central donor block, has been synthesized and used as donor material in organic solar cells (OSCs). With thermal annealing (TA) and solvent vapor annealing (SVA) treatment, the blend of R3T-TBFO/PC71BM shows a higher hole mobility of 1.37 × 10−4 cm2 V−1 s−1 and a more balanced charge mobilities. Using a structure of ITO/PEDOT:PSS/R3T-TBFO:PC71BM/ZrAcac/Al, the device with TA treatment delivered a moderate power conversion efficiency (PCE) of 5.63%, while device after TA + SVA treatment showed a preferable PCE of 6.32% with a high fill factor (FF) of 0.72. |
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| Keywords: | Organic solar cells Small molecular photovoltaic materials Asymmetric Thieno[2,3-f]benzofuran |
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