Two simple dithienosilole unit (DTS)-based nonfused small molecular acceptors (SiOC2C6–4F and SiOC2C6–4Cl) using two DTS moieties linked alkoxyl substituted benzene ring as the central core (D) and bis(5,6-difluro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene)dimalononitrile or bis(5,6-dichloro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene)dimalononitrile as the end groups have been synthesized. The optical, electrochemical properties and device photovoltaic performance of these two molecules were investigated in detail. DFT results indicates S⋯O interactions involving alkoxyl groups of benzyl rings and thienyl S atoms of DTS can act as conformational “locks” to enhance molecular planarity. when the polymer PBDB-T was chosen as the donor, the PBDB-T:SiOC2C6–4F-based device provided a high PCE of 9.68% with a V_oc of 0.90 V, a J_sc of 17.02 mA/cm² and an FF of 63.00%, while the PBDB-T:SiOC2C6–4Cl-based device exhibited a PCE of 11.29% with a V_oc of 0.87V, a J_sc of 20.35 mA/cm² and an FF of 63.73%, which is so far the best performance reported for organic photovoltaic using silole-based small-molecule acceptors.

使用两个DTS部分连接烷氧基取代的苯环作为中心核（D）和bis（5,6-difluro-3-oxo ）的两个简单的基于二硫杂硅烷基单元（DTS）的非融合小分子受体（SiOC2C6–4F和SiOC2C6–4Cl） -2,3-二氢-1H-茚-2,1-二亚烷基）二甲基腈或双（5,6-二氯-3-氧代-2,3-二氢-1H-茚-2,1-二亚烷基）二甲基腈端基已合成。详细研究了这两个分子的光学，电化学性质和器件光伏性能。DFT结果表明，涉及DTS苄基环的烷氧基和噻吩基S原子的S⋯O相互作用可充当构象“锁”，以增强分子的平面性。当聚合物PBDB-T被选作供体时，PBDB-T：SiOC2C6-4FPBDB-T：SiOC2C6–4Cl基器件的PCE为9.68％，V _oc为0.90 V，J _sc为17.02 mA / cm ^2，且FF为63.00％。用11.29％V _OC 0.87V，一个的Ĵ _SC 20.35毫安/厘米²和63.73％的FF，这是迄今为止的最佳性能使用基于噻咯-小分子受体报告有机光伏。