Low bandgap small molecules, BDTTNTTR and BDTSTNTTR, with benzo[1,2-b:4,5-b′]dithiophene (BDT) as the central donor unit and naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole (NT) as the second acceptor block, which were also π-bridged with terthiophenes on both sides, and end-capped with 3-ethylrhodanine electron-accepting groups, have been successfully synthesized for highly efficient small molecule solar cells (SM-OSCs). Based on tactful material design and device engineering, the resulting SM-OSCs processed with a halogen-free solvent of CS₂ exhibited a high efficiency of 11.53% with a very small energy loss of 0.57 eV.

中文翻译：

---

通过材料设计和设备工程实现了高效无卤溶剂处理的小分子有机太阳能电池

低带隙小分子BDTTNTTR和BDTSTNTTR，以苯并[1,2- b：4,5- b ']二噻吩（BDT）为中心供体单元，萘并[1,2- c：5,6- c ']已经成功合成了以双噻吩为π-桥并以3-乙基若丹宁电子接受基团封端的双[1,2,5]噻二唑（NT）作为第二受体嵌段。小分子太阳能电池（SM-OSC）。基于巧妙的材料设计和设备工程设计，用CS ₂的无卤溶剂处理的最终SM-OSC的效率高达11.53％，而能量损失却很小，仅为0.57 eV。