摘要：Three acceptor-donor-acceptor(A-D-A) small molecules DCAODTBDT,DRDTBDT and DTBDTBDT using dithieno[2,3-d:2',3'-d']benzo[l,2-b:4,5-b']dithiophene as the central building block,octyl cyanoacetate,3-octylrhodanine and thiobarbituric acid as the end groups were designed and synthesized as donor materials in solution-processed photovoltaic cells(OPVs).The impacts of these different electron withdrawing end groups on the photophysical properties,energy levels,charge carrier mobility,morphologies of blend films,and their photovoltaic properties have been systematically *** device based on DRDTBDT gave the best power conversion efficiency(PCE) of 8.34%,which was significantly higher than that based on DCAODTBDT(4.83%) or DTBDTBDT(3.39%).These results indicate that rather dedicated and balanced consideration of absorption,energy levels,morphology,mobility,*** the design of small-molecule-based OPVs(SM-OPVs)and systematic investigations are highly needed to achieve high performance for SM-OPVs.

摘要：锂金属电池具有能量密度高的优点,有望成为下一代可充电电池.然而,其液态电解液泄露的风险及锂枝晶生长造成的短路等问题阻碍了其应用.使用凝胶电解质被认为是提高锂金属电池安全性的有效方法,但是因锂枝晶生长导致循环寿命差的问题仍未有效解决.本文设计了一种结合原位聚合和硼酸添加剂双重效果的凝胶电解质(B-GPE),并组装了锂金属电池进行测试.其中,原位聚合的方法使得凝胶电解质与电极界面接触良好,硼酸添加剂一方面可以增强锂盐的稳定性,抑制副反应发生;另一方面可以形成稳固的SEI膜,抑制锂枝晶的生长.以上双重作用使得这种凝胶电解质应用于锂金属电池可以获得超长循环寿命,在0.5 C的倍率下循环950圈仍有87.7%的容量保持率,是目前类似的凝胶电解质、液态电解液和固态电解质应用中循环寿命最出色的.该结果证明结合原位聚合和硼酸添加剂双重效果是制备高性能凝胶电解质的简单且有效的策略,并进一步为锂金属电池的广泛应用提供了有价值的方法.

摘要：本文设计合成了基于噻吩[3,2b]噻吩稠环受体具有不同末端基团的三个窄带系非富勒烯受体TTIC-M,TTIC和TTIC-F.采用宽带隙聚合物PBDB-T为给体在300–900 nm光谱范围内形成了互补光吸收,基于TTIC-M,TTIC和TTIC-F的光伏器件分别获得了高达9.97%,10.87%和9.51%的效率和高达21 mA cm^(-2)的短路电流密度.

摘要：本文设计合成了三个受体-给体-受体骨架的非富勒烯受体,它们具有不同数目氟原子修饰的端基,将其分别命名为OBTT-0F,OBTT-2F和OBTT-4F.氟端基使得最低未占分子轨道下移,光谱红移,π-π堆叠和非富勒烯受体的结晶性增强.通过与聚合物给体PBDB-T共混,基于OBTT-2F的分子同时获得了相对高的电流(20.83mAcm^-2)和能量转换效率(12.36%).该结果证明向端基上引入氟原子是调控非富勒烯受体光电性能和光伏效率的简单有效的方法.

摘要：本工作中,在我们发展的半经验模型的指导下,设计合成了两个A-D-A骨架受体分子,6T-OFIC和5T-OFIC.因其较长的共轭骨架,6T-OFIC的截止吸收波长为946 nm.相比于6T-OFIC,因其骨架少一个噻吩单元,5T-OFIC分子的截止吸收波长为927 nm,更接近半经验模型所预测的最佳单结器件的截止吸收波长.最终,基于PM6:5T-OFIC的器件获得了13.43%的能量转换效率,高于PM6:6T-OFIC器件.以F-2Cl作为第三组份,基于PM6:F-2Cl:5TOFIC的三元器件其填充和开压得到了明显的提高,最终获得了15.45%的能量转换效率.