Stable Ultrabroad‐Absorbing Radical Achieves Efficient NIR‐II Photothermal Conversion via Facile Synthesis

. This study not only presents one of the most efficient and readily synthesized organic photothermal materials to date, but also establishes a new molecular design strategy that expands the functional landscape of next-generation radical-based electron acceptor building blocks and open-shell radical semiconductors for electronics, challenging conventional closed-shell strategies in organic electronics.