Quest for efficient and lead-free perovskite absorber layer is the need of the hour. The less explored titanium-based halide perovskites might be the non-toxic answer for the efficient yet toxic, organic, lead-based halide perovskite. It is of great interest to synthesize cesium titanium iodide perovskite and to investigate their novel properties. We have reported the synthesis of vacancy-ordered double perovskite cesium titanium iodide (Cs₂TiI₆) at room temperature. Structural, electrical and optical properties are investigated. Broad photoluminescence spectrum is observed. Absorbance and stability of this compound are discussed in detail. Using the absorption data, we have simulated solar cells with different transport layers to give an insight into its application.

寻求高效、无铅的钙钛矿吸收层是当前的需要。较少探索的钛基卤化物钙钛矿可能是高效但有毒的有机铅基卤化物钙钛矿的无毒答案。合成铯钛碘化物钙钛矿并研究其新特性引起了人们的极大兴趣。我们报道了在室温下合成空位有序双钙钛矿碘化铯钛（Cs ₂ TiI ₆ ）。研究了结构、电学和光学特性。观察到宽的光致发光光谱。详细讨论了该化合物的吸光度和稳定性。利用吸收数据，我们模拟了具有不同传输层的太阳能电池，以深入了解其应用。