Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage road, CB3 0FS, Cambridge, UK.
C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome "Tor Vergata", via del Politecnico 1, Rome 00133, Italy and Cicci Research srl, via Giordania 227, 58100 Grosseto, Italy.
Nanoscale. 2017 Apr 6;9(14):4700-4706. doi: 10.1039/c7nr00784a.
Operational stability is the main issue hindering the commercialisation of perovskite solar cells. Here, a long term light soaking test was performed on large area hybrid halide perovskite solar cells to investigate the morphological and chemical changes associated with the degradation of photovoltaic performance occurring within the devices. Using Scanning Transmission Electron Microscopy (STEM) in conjunction with EDX analysis on device cross sections, we observe the formation of gold clusters in the perovskite active layer as well as in the TiO mesoporous layer, and a severe degradation of the perovskite due to iodine migration into the hole transporter. All these phenomena are associated with a drastic drop of all the photovoltaic parameters. The use of advanced electron microscopy techniques and data processing provides new insights on the degradation pathways, directly correlating the nanoscale structure and chemistry to the macroscopic properties of hybrid perovskite devices.
运行稳定性是阻碍钙钛矿太阳能电池商业化的主要问题。在这里，对大面积混合卤化物钙钛矿太阳能电池进行了长期的光渗透测试，以研究与器件内光伏性能下降相关的形态和化学变化。我们使用扫描透射电子显微镜（STEM）结合器件横截面的 EDX 分析，观察到金簇在钙钛矿活性层以及 TiO2 介孔层中的形成，以及由于碘向空穴传输体迁移而导致钙钛矿的严重降解。所有这些现象都与所有光伏参数的急剧下降有关。先进的电子显微镜技术和数据处理的使用为降解途径提供了新的见解，将纳米级结构和化学直接与混合钙钛矿器件的宏观性质相关联。
