Schlipf Johannes, Askar Abdelrahman M, Pantle Florian, Wiltshire Benjamin D, Sura Anton, Schneider Peter, Huber Linus, Shankar Karthik, Müller-Buschbaum Peter
Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Str. 1, 85748, Garching, Germany.
Department of Electrical and Computer Engineering, University of Alberta, 9211-116 St, Edmonton, AB T6G 1H9, Canada.
Sci Rep. 2018 Mar 20;8(1):4906. doi: 10.1038/s41598-018-23211-x.
Solar cells employing hybrid perovskites have proven to be a serious contender versus established thin-film photovoltaic technologies. Typically, current photovoltaic devices are built up layer by layer from a transparent substrate (bottom-up approach), while the deposition of the perovskite layer itself comes with many challenges including the control of crystal size, nucleation density and growth rate. On the other hand, single crystals have been used with great success for studying the fundamental properties of this new class of optoelectronic materials. However, optoelectronic devices fabricated from single crystals often employ different materials than in their thin film counterparts. Here, we demonstrate various top-down approaches for low-temperature processed organic-inorganic metal halide perovskite single crystal devices. Our approach uses common and well-established material combinations that are often used in polycrystalline thin film devices. The use of a polymer bezel allows easier processing of small crystals and the fabrication of solution-processed, free-standing perovskite single crystal devices. All in all these approaches can supplement other measurements of more fundamental material properties often requiring perovskite single crystals by rendering a photovoltaic characterization possible on the very same crystal with comparable material combinations as in thin film devices.
采用混合钙钛矿的太阳能电池已被证明是与成熟的薄膜光伏技术相抗衡的有力竞争者。通常，当前的光伏器件是从透明基板开始逐层构建的（自下而上的方法），而钙钛矿层本身的沉积面临许多挑战，包括晶体尺寸、成核密度和生长速率的控制。另一方面，单晶已被成功用于研究这类新型光电子材料的基本特性。然而，由单晶制造的光电器件通常使用与薄膜器件不同的材料。在这里，我们展示了用于低温处理的有机-无机金属卤化物钙钛矿单晶器件的各种自上而下的方法。我们的方法使用了多晶薄膜器件中常用且成熟的材料组合。聚合物边框的使用使得小晶体的加工更容易，并且能够制造溶液处理的独立钙钛矿单晶器件。总而言之，所有这些方法可以通过在与薄膜器件具有可比材料组合的同一晶体上进行光伏表征，来补充通常需要钙钛矿单晶的其他更基本材料特性的测量。
