Two small molecules named BT-TPD and TBDT-TTPD with a thieno[3,4-c]pyrrole-4,6-dione (TPD) unit were designed and synthesized for solution-processed bulk-heterojunction solar cells. Their thermal, electrochemical, optical, charge-transport, and photovoltaic characteristics were investigated. These compounds exhibit strong absorption at 460-560 nm and low highest occupied molecular orbital levels (-5.36 eV). Field-effect hole mobilities of these compounds are 1.7-7.7×10(-3) cm(2) V(-1) s(-1). Small-molecule organic solar cells based on blends of these donor molecules and a acceptor display power conversion efficiencies as high as 4.62% under the illumination of AM 1.5G, 100 mW cm(-2).
Solar CellsSmall-molecule organic solar cells (SMOSCs) have recently gained attention as sources of renewable energy owing to their advantages such as easier synthesis, less batch-to-batch variation, and better reproducibility with regard to performance as compared to polymer-based solar cells. In their Full Paper on page 1045 ff., highlighted on the Inside Cover, Yun-Hi Kim et al. designed and synthesized two small molecules bearing a thieno [3,4-c]pyrrole-4,6-dione (TPD) unit. These compounds show an excellent thermal stability, strong absorption, relatively low HOMO levels, and high hole mobility. SMOSCs based on blends of these donor molecules and a phenyl-C 61 -butyric acid methyl ester acceptor display power conversion efficiencies as high as 4.6 %.
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