Tepliakova Marina M, Mikheeva Aleksandra N, Frolova Lyubov A, Boldyreva Aleksandra G, Elakshar Aly, Novikov Artyom V, Tsarev Sergey A, Ustinova Marina I, Yamilova Olga R, Nasibulin Albert G, Aldoshin Sergey M, Stevenson Keith J, Troshin Pavel A
Skolkovo Institute of Science and Technology, Nobel st. 3, 143026 Moscow, Russia.
Institute for Problems of Chemical Physics, Russian Academy of Sciences, Semenov av. 1, 142432, Chernogolovka, Moscow region, Russia.
J Phys Chem Lett. 2020 Jul 16;11(14):5563-5568. doi: 10.1021/acs.jpclett.0c01600. Epub 2020 Jun 30.
Recent studies have shown that charge transport interlayers with low gas permeability can increase the operational lifetime of perovskite solar cells serving as a barrier for migration of volatile decomposition products from the photoactive layer. Herein we present a hybrid hole transport layer (HTL) comprised of p-type polytriarylamine (PTAA) polymer and vanadium(V) oxide (VO). Devices with PTAA/VO top HTL reach up to 20% efficiency and demonstrate negligible degradation after 4500 h of light soaking, whereas reference cells using PTAA/MoO as HTL lose ∼50% of their initial efficiency under the same aging conditions. It was shown that the main origin of the enhanced device stability lies in the higher tolerance of VO toward MAPbI compared to the MoO interlayer, which tends to facilitate perovskite decomposition. Our results demonstrate that the application of PTAA/VO hybrid HTL enables long-term operational stability of perovskite solar cells, thus bringing them closer to commercial applications.
最近的研究表明，具有低气体渗透性的电荷传输中间层可以增加钙钛矿太阳能电池的运行寿命，作为挥发性分解产物从光活性层迁移的屏障。在此，我们展示了一种由p型聚三芳基胺（PTAA）聚合物和氧化钒（VO）组成的混合空穴传输层（HTL）。具有PTAA/VO顶部HTL的器件效率高达20%，并且在4500小时的光浸泡后显示出可忽略不计的降解，而使用PTAA/MoO作为HTL的参考电池在相同老化条件下损失了约50%的初始效率。结果表明，器件稳定性增强的主要原因在于VO对MAPbI的耐受性高于MoO中间层，MoO中间层往往会促进钙钛矿分解。我们的结果表明，PTAA/VO混合HTL的应用能够实现钙钛矿太阳能电池的长期运行稳定性，从而使其更接近商业应用。
