Cesium Titanium(IV) Bromide Thin Films Based Stable Lead-free Perovskite Solar Cells
Cesium Titanium(IV) Bromide Thin Films Based Stable Lead-free Perovskite Solar Cells
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DOI：
10.1016/j.joule.2018.01.009
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发表时间：
2018-03-21
期刊：
影响因子：
39.8
通讯作者：
Padture, Nitin P.
中科院分区：
文献类型：
--
作者：
Chen, Min;Ju, Ming-Gang;Padture, Nitin P.
人们正致力于寻找用于光伏应用的全无机无铅卤化物钙钛矿（HP）。然而，联合收割机结合所有理想的属性-易于合成，有利的带隙，突出的光电性能，高稳定性，无毒性-候选HP是极其罕见的。在这里，我们通过实验证明了溴化铯钛（IV）（Cs2 TiBr 6）在钙钛矿太阳能电池（PSC）中的前景，Cs2 TiBr 6是Ti基空位有序双钙钛矿卤化物家族的一部分。我们表明，第一次，高品质的Cs2 TiBr 6薄膜可以通过一个简单的低温蒸气为基础的方法制备。这些薄膜表现出良好的带隙为1.8 eV，长和平衡的载流子扩散长度超过100 nm，合适的能级，和优越的上级固有和环境稳定性。第一个基于Cs2 TiBr 6薄膜的PSC演示显示出高达3.3%的稳定效率。洞察Cs2 TiBr 6膜的形成机制和PSC设备的操作提供，指向改善钛基PSC的方向。
Significant effort is being devoted to the search for all-inorganic Pb-free halide perovskites (HPs) for photovoltaic applications. However, candidate HPs that combine all the desirable attributes - ease of synthesis, favorable bandgaps, outstanding optoelectronic properties, high stability, no toxicity - are extremely rare. Here, we demonstrate experimentally the promise of cesium titanium(IV) bromide (Cs2TiBr6), a part of the Ti-based vacancy-ordered double-perovskite halides family, in perovskite solar cells (PSCs). We show, for the first time, that high-quality Cs2TiBr6 thin films can be prepared through a facile low-temperature vapor-based method. These films exhibit a favorable bandgap of 1.8 eV, long and balanced carrier-diffusion lengths exceeding 100 nm, suitable energy levels, and superior intrinsic and environmental stability. The first demonstration of Cs2TiBr6 thin films-based PSCs shows stable efficiency of up to 3.3%. Insights into the Cs2TiBr6 film-formation mechanisms and the PSC device operation are provided, pointing to directions for improving Ti-based PSCs.