Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , Qingdao 266101 , PR China.
University of Chinese Academy of Sciences , Beijing 100049 , PR China.
Nano Lett. 2018 Nov 14;18(11):6941-6947. doi: 10.1021/acs.nanolett.8b02863. Epub 2018 Oct 25.
This work demonstrates a novel photovoltaic application in which graphdiyne (GD) can be employed as a host material in a perovskite active layer for the first time. In the device fabrication, the best molar ratio for active materials is verified as PbI/MAI/GD being 1:1:0.25, yielding a peak power-conversion efficiency of 21.01%. We find that graphdiyne, as the host material, exerts significant influence on the crystallization, film morphology, and a series of optoelectronic properties of the perovskite active layer. A uniform MAPbI film with highly crystalline qualities, large domain sizes, and few grain boundaries was realized with the introduction of graphdiyne. Moreover, the current-voltage hysteresis was negligible, and device stability was significantly improved as well. The results indicate that graphdiyne as the host active material presents great potential for the enhancement of the performance of perovskite solar cells.
这项工作展示了一种新型的光伏应用，其中石墨炔 (GD) 首次被用作钙钛矿活性层的主体材料。在器件制备中，验证了活性材料的最佳摩尔比为 PbI/MAI/GD 为 1:1:0.25，峰值能量转换效率为 21.01%。我们发现，石墨炔作为主体材料，对钙钛矿活性层的结晶、薄膜形貌和一系列光电性能有显著影响。引入石墨炔后，实现了具有高度结晶质量、大畴尺寸和少晶界的均匀 MAPbI 薄膜。此外，电流-电压滞后可忽略不计，器件稳定性也得到显著提高。结果表明，石墨炔作为主体活性材料在提高钙钛矿太阳能电池的性能方面具有很大的潜力。
