School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao266590, China.
Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao266101, China.
ACS Appl Mater Interfaces. 2023 Feb 1;15(4):5538-5546. doi: 10.1021/acsami.2c19590. Epub 2023 Jan 18.
All-polymer solar cells (all-PSCs) have been widely studied owing to their unique mechanical flexibility and stability. However, all-PSCs have a lower efficiency than small-molecule acceptor-based PSCs. In the work, a ternary quasi-all-polymer solar cell (Q-all-PSC) using a synergy of the ternary strategy and solid additive engineering is reported. The introduction of PCBM can not only match the energy level of the photoactive materials with an improved open circuit voltage () of the ternary devices but also enhance photon capture, which can improve short circuit current density. It is found that there is effective charge transfer between PCBM and PY-IT, which can form an electron transport channel and promote efficient charge transport. Moreover, the introduction of PCBM made the PM6/PY-IT/PCBM ternary blends more crystalline while slightly reducing phase separation, resulting in a suitable domain size. Importantly, by introducing a high dielectric-constant PFBEK solid additive as the fasten matrix, the Q-all-PSC's efficiency can reach 16.42%. This method provides a new idea for future research on all-polymer solar cells.
全聚合物太阳能电池（all-PSCs）因其独特的机械柔韧性和稳定性而受到广泛研究。然而，与基于小分子受体的太阳能电池相比，全聚合物太阳能电池的效率较低。在这项工作中，报道了一种使用三元策略和固态添加剂工程协同作用的三元准全聚合物太阳能电池（Q-all-PSC）。PCBM 的引入不仅可以匹配光活性材料的能级，提高三元器件的开路电压（），还可以增强光子捕获，从而提高短路电流密度。研究发现，PCBM 与 PY-IT 之间存在有效的电荷转移，可以形成电子传输通道，促进高效电荷传输。此外，PCBM 的引入使 PM6/PY-IT/PCBM 三元混合物更加结晶，同时略微减少相分离，从而获得合适的畴尺寸。重要的是，通过引入具有高介电常数的 PFBEK 固态添加剂作为紧固基质，Q-all-PSC 的效率可以达到 16.42%。该方法为全聚合物太阳能电池的未来研究提供了新的思路。
