Thieno[3,4-c]pyrrole-4,6-dione (TPD) unit has been widely used to construct a great deal of D-π-A p-type copolymers due to its strong electron-deficient property. However, there are limited reports on the TPD-based n-type materials, particularly small molecule non-fullerene acceptors (NFAs), mainly due to the time-consuming synthetic routes. Herein, two new TPD-based NFAs named as TPD-Th1 and TPD-Th3 were successfully obtained, adopting indacenodithiophene (IDT) as the central core and rhodanine (R) or 2-(1,1-dicyanomethylene)rhodanine (RCN) as the terminal electron-withdrawing unit. Both TPD-Th1 and TPD-Th3 exhibit highly planar structure due to the intramolecular noncovalently conformational locking between the O atom on the TPD unit and H atoms of two neighboring thiophene ring. The optimized PTB7-Th:TPD-Th3 photovoltaic devices show a much higher power conversion efficiency (PCE) of 5.53% in comparison with PTB7-Th:TPD-Th1 (PCE = 0.62%). The latter lower PCE could be attributed to the unmatched LUMO energy levels. Our results open a unique way to utilize TPD to construct small molecule NFAs to achieve a relatively high V_OC and PCE.

噻吩并[3,4- c ]吡咯-4,6-二酮（TPD）单元因其强大的电子不足特性而被广泛用于构建大量D-π-Ap型共聚物。但是，基于TPD的n型材料，特别是小分子非富勒烯受体（NFA）的报道很少，这主要是由于耗时的合成途径。在这里，成功地获得了两个新的基于TPD的NFA，命名为TPD-Th1和TPD-Th3，采用茚并二噻吩（IDT）作为中心核心，并使用了若丹宁（R）或2-（1,1-二氰基亚甲基）若丹宁（RCN）末端吸电子单元。无论TPD-TH1和TPD-Th3的由于在TPD单元上的O原子与两个相邻的噻吩环的H原子之间的分子内非共价构象锁定，它们具有高度平面的结构。与PTB7-Th：TPD-Th1（PCE = 0.62％）相比，优化的PTB7-Th：TPD-Th3光伏器件显示出5.53％的更高的功率转换效率（PCE ）。后者较低的PCE可能归因于LUMO能量水平无与伦比。我们的结果为利用TPD构造小分子NFA以获得相对较高的V _OC和PCE开辟了一条独特的途径。