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Ultra‐narrow bandgap (ultra‐NBG) small molecule acceptors (SMAs) show great potential in organic solar cells (OSCs) due to the extended near‐infrared (NIR) absorption. In this work, a synergetic alkoxy side‐chain and chlorine‐contained end group strategy is employed to achieve A‐DA'D‐A type ultra‐NBG SMAs by introducing alkoxy chains with oxygen atom at the second position into the thiophene β position...
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