Layer-by-Layer Processed Ternary Organic Photovoltaics with Efficiency over 18%
Layer-by-Layer Processed Ternary Organic Photovoltaics with Efficiency over 18%
复制标题
逐层%20加工%20三元%20有机%20光伏%20with%20效率%20over%2018%
DOI：
10.1002/adma.202007231
复制
发表时间：
2021-02-18
影响因子：
29.4
通讯作者：
Chen, Hongzheng
中科院分区：
文献类型：
--
作者：
Zhan, Lingling;Li, Shuixing;Chen, Hongzheng
获得精细调节的活性层形态以促进电荷产生和电荷提取两者长期以来一直是有机光致发光（OPV）领域的目标。在这里，提出并证明了通过协同结合逐层（LBL）过程和三元策略来解决上述挑战的解决方案。通过向PM 6：BO-4Cl的二元施主：受主主体中添加具有较低可扩散性的不对称电子受主BTP-S2，可以在LbL处理期间在OPV器件中形成垂直相分布，其中施主富集在阳极，受主富集在阴极。相比之下，基于PM 6：BO-4Cl的LbL型二元OPV仍显示出体异质结状形态。垂直相位分布的形成不仅可以减少电荷复合，而且可以促进电荷收集，从而提高LbL型三元OPV的光电流和填充因子。因此，LbL型三元OPV表现出18.16%的最佳效率（认证：17.8%），这是迄今为止报道的OPV的最高值之一。这项工作提供了一种简便有效的方法，实现高效率的OPV与预期的形态，并证明了LBL型三元策略是一个有前途的程序，在制造OPV器件从目前的实验室研究，以未来的工业生产。
Obtaining a finely tuned morphology of the active layer to facilitate both charge generation and charge extraction has long been the goal in the field of organic photovoltaics (OPVs). Here, a solution to resolve the above challenge via synergistically combining the layer-by-layer (LbL) procedure and the ternary strategy is proposed and demonstrated. By adding an asymmetric electron acceptor, BTP-S2, with lower miscibility to the binary donor:acceptor host of PM6:BO-4Cl, vertical phase distribution can be formed with donor-enrichment at the anode and acceptor-enrichment at the cathode in OPV devices during the LbL processing. In contrast, LbL-type binary OPVs based on PM6:BO-4Cl still show bulk-heterojunction like morphology. The formation of the vertical phase distribution can not only reduce charge recombination but also promote charge collection, thus enhancing the photocurrent and fill factor in LbL-type ternary OPVs. Consequently, LbL-type ternary OPVs exhibit the best efficiency of 18.16% (certified: 17.8%), which is among the highest values reported to date for OPVs. The work provides a facile and effective approach for achieving high-efficiency OPVs with expected morphologies, and demonstrates the LbL-type ternary strategy as being a promising procedure in fabricating OPV devices from the present laboratory study to future industrial production.