5,11‐Di(thiophen‐2‐yl)Tetracene: A Novel Tetracene Derivative for Efficient Singlet Fission with Enhanced Physical and Chemical Stability in Thin Films

Abstract Singlet fission (SF), a unique photophysical process in organic semiconductors, enables the splitting of a singlet exciton into two triplet excitons, offering the potential to exceed the Shockley–Queisser limit in solar cells by efficiently utilizing high‐energy photons. For seamless integration with silicon solar cells, materials with the lowest excited singlet and triplet energies near 2.2 and 1.1 eV, respectively, are crucial. Among various SF candidates, tetracene derivatives have garnered significant attention due to their ability to sensitize silicon layers and their distinct spectroscopic properties. However, their limited chemical stability and challenges in modulating chromophore stacking and electronic interactions hinder practical applications. In this study, 5,11‐di(thiophen‐2‐yl)tetracene ( 2T‐Tc ) is synthesized as a novel approach to overcome these limitations. Th…