Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló, Spain.
Phys Chem Chem Phys. 2013 Oct 21;15(39):16456-62. doi: 10.1039/c3cp52363b. Epub 2013 Aug 15.
Using impedance spectroscopy, we demonstrate that the low fill factor (FF) typically observed in small molecule solar cells is due to hindered carrier transport through the active layer and hindered charge transfer through the anode interfacial layer (IFL). By carefully tuning the active layer thickness and anode IFL in BDT(TDPP)2 solar cells, the FF is increased from 33 to 55% and the PCE from 1.9 to 3.8%. These results underscore the importance of simultaneously optimizing active layer thickness and IFL in small molecule solar cells.
利用阻抗谱，我们证明了小分子太阳能电池中通常观察到的低填充因子（FF）是由于活性层中载流子输运受阻和阳极界面层（IFL）中电荷转移受阻所致。通过仔细调整 BDT(TDPP)2 太阳能电池的活性层厚度和阳极 IFL，FF 从 33%增加到 55%，PCE 从 1.9%增加到 3.8%。这些结果强调了同时优化小分子太阳能电池中活性层厚度和 IFL 的重要性。
