Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University , Wuhan 430072, China.
CAS Research/Education Center for Excellence in Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
ACS Appl Mater Interfaces. 2017 Oct 4;9(39):34146-34152. doi: 10.1021/acsami.7b10275. Epub 2017 Sep 21.
Two new non-fullerene acceptors, IDTC and IDTO, were designed and synthesized for the application in organic solar cells (OSCs). Compared with IDTC, the introduction of electron-donating alkoxy groups of IDTO leads to a higher LUMO level with a slightly blue-shifted absorption. Using the polymer PBDB-T as donor and the two small molecules as acceptors in the conventional device structure, the IDTC-based OSC exhibits a power conversion efficiency (PCE) of 9.35% with an open-circuit voltage (V) of 0.917 V, a short-circuit current density (J) of 16.56 mA cm, and a fill factor (FF) of 61.61%. For the OSC based on IDTO, a higher PCE of 10.02% with a V of 0.943 V, a J of 16.25 mA cm, and an FF of 65.41% are obtained. The more balanced μ/μ, evident aggregation, and phase separation contribute to the higher FF for the device based on IDTO. The increased J for the device based on PBDB-T:IDTC can be attributed to the red-shifted and stronger absorption of the PBDB-T:IDTC blend film. These results indicate fine-tuning the electronic energy and absorption of non-fullerene acceptors is feasible to improve the performance of OSCs.
两种新型非富勒烯受体 IDTC 和 IDTO 被设计和合成用于有机太阳能电池 (OSC)。与 IDTC 相比，IDTO 中引入供电子烷氧基基团导致其具有更高的 LUMO 能级和略微蓝移的吸收。在传统器件结构中，以聚合物 PBDB-T 为给体，以这两种小分子为受体，基于 IDTC 的 OSC 表现出 9.35%的功率转换效率 (PCE)，开路电压 (V) 为 0.917 V，短路电流密度 (J) 为 16.56 mA cm，填充因子 (FF) 为 61.61%。对于基于 IDTO 的 OSC，获得了更高的 PCE（10.02%）、V（0.943 V）、J（16.25 mA cm）和 FF（65.41%）。更高的 μ/μ、明显的聚集和相分离有助于提高基于 IDTO 的器件的 FF。基于 PBDB-T:IDTC 的器件 J 的增加归因于 PBDB-T:IDTC 共混膜的红移和更强的吸收。这些结果表明，精细调整非富勒烯受体的电子能量和吸收是提高 OSC 性能的可行方法。
