【摘 要】
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Star-shaped small molecules have attracted great attention for organic solar cells (OSCs) because they have three-dimensional charge-transport characteristics,strong light absorption capacities and easily tun-able energy levels.Herein,three-and four-armed
【机 构】
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Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences,Ningbo 315201,C
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Star-shaped small molecules have attracted great attention for organic solar cells (OSCs) because they have three-dimensional charge-transport characteristics,strong light absorption capacities and easily tun-able energy levels.Herein,three-and four-armed star-shaped small molecule donors,namely BDT-3Th and BDT-4Th,respectively,have been successfully designed and synthesized,which used benzodithio-phene (BDT) as the central unit.The two star-shaped intermediates (2a and 2b) could be simultaneously obtained by one-step of Suzuki coupling,and 1,2-dimethoxyethane played a key role in the Suzuki cou-pling.Both of them have excellent thermal stability,good solubility and broad absorption.Four-armed BDT-4Th shows a slightly higher extinction coefficient,a deeper HOMO energy level and an obviously better phase separation morphology when blended with Y6 than three-armed BDT-3Th.As a result,in-creased power conversion efficiency (PCE) of 5.83％ is obtained in the BDT-4Th:Y6-based OSC devices,which is obviously higher than that of the BDT-3Th:Y6-based devices (PCE =3.78％).To the best of our knowledge,this is the highest PCE among the BDT-based star-shaped donors-based OSCs.This result pro-vides an effective strategy to obtain star-shaped small molecule donor materials for high efficient organic solar cells.
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