Institute of Physics "Gleb Wataghin" - University of Campinas 777 Sérgio Buarque de Holanda Street - Cidade Universitária Zeferino Vaz, Barão Geraldo, Zip code: 13083-859, Campinas-SP, Brazil.
Sci Rep. 2018 Jan 24;8(1):1563. doi: 10.1038/s41598-018-19746-8.
In the last few years, research on dye-sensitised devices has been focused on the development of solar cells, based on CHNHPbX (X = I, Br, Cl) composites with perovskite structure. The deposition of perovskite thin films is usually carried out by solution-based processes using spin-coating techniques that result in the production of high quality films. Solar cells made by this method exceed 20% efficiency, with the potential for use in large scale production through ink print or screen printing techniques. As an alternative route, perovskite thin films can be deposited through thermal evaporation. A new method is proposed to produce CHNHPbI, based on a radio-frequency (rf) -sputtering technique that results in a high reproducibility of the films and is compatible with roll-to-roll processes. We deposited thin films of lead-sulphide (PbS) and converted them into perovskite by placing the films in an iodine atmosphere, followed by dipping in a solution of methylammonium iodide (CHNHI). The conversions to PbI and CHNHPbI were confirmed by elemental analyses, absorption, and photoluminescence spectroscopy. Structural properties were revealed by X-ray diffraction and infrared and Raman spectroscopy.
在过去的几年中，染料敏化器件的研究主要集中在基于 CHNHPbX（X=I、Br、Cl）钙钛矿结构复合材料的太阳能电池的开发上。钙钛矿薄膜的沉积通常通过使用旋涂技术的基于溶液的工艺来进行，这导致产生高质量的薄膜。通过这种方法制造的太阳能电池的效率超过 20%，并且有可能通过喷墨印刷或丝网印刷技术进行大规模生产。作为替代方法，钙钛矿薄膜可以通过热蒸发沉积。提出了一种新的基于射频（rf）-溅射技术的 CHNHPbI 生产方法，该方法使薄膜具有很高的重现性，并且与卷对卷工艺兼容。我们沉积了硫化铅（PbS）薄膜，并通过将其置于碘气氛中，然后浸入碘化甲铵（CHNHI）溶液中，将其转化为钙钛矿。通过元素分析、吸收和光致发光光谱证实了 PbI 和 CHNHPbI 的转化。通过 X 射线衍射、红外和拉曼光谱揭示了结构特性。
