Inorganic caesium lead iodide perovskite solar cells
Inorganic caesium lead iodide perovskite solar cells
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DOI：
10.1039/c5ta06398a
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发表时间：
2015-01-01
影响因子：
11.9
通讯作者：
Snaith, Henry J.
中科院分区：
文献类型：
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作者：
Eperon, Giles E.;Paterno, Giuseppe M.;Snaith, Henry J.
绝大多数钙钛矿太阳能电池的研究集中在有机-无机三卤化铅钙钛矿。在此，我们首次提出了无机CsPbI 3钙钛矿太阳能电池。CsPbI 3在室温下通常存在于黄色的非钙钛矿相，但通过仔细的加工控制和低温相变路线的开发，我们已经在室温下稳定了黑色钙钛矿相的材料。因此，我们已经制造了各种架构的太阳能电池器件，对于平面异质结架构，电流-电压曲线测量效率高达2.9%，并且稳定的功率转换效率为1.7%。功能良好的平面结器件证明了这种材料中的远程电子和空穴传输。重要的是，这项工作确定了有机阳离子不是必需的，而仅仅是形成具有良好光伏特性的三碘化铅钙钛矿的便利。我们还观察到显着的速率依赖性的电流-电压滞后CsPbI 3设备，尽管没有有机极性分子先前被认为是通过铁电极化诱导滞后的候选人。由于其空间群，CsPbI 3不能是铁电材料，因此我们可以得出结论，铁电性不需要解释钙钛矿太阳能电池中的电流-电压滞后。我们关于无机钙钛矿太阳能电池的工作报告为进一步的发展铺平了道路，这些发展可能会导致更热稳定的钙钛矿太阳能电池和其他光电器件。
The vast majority of perovskite solar cell research has focused on organic-inorganic lead trihalide perovskites. Herein, we present working inorganic CsPbI3 perovskite solar cells for the first time. CsPbI3 normally resides in a yellow non-perovskite phase at room temperature, but by careful processing control and development of a low-temperature phase transition route we have stabilised the material in the black perovskite phase at room temperature. As such, we have fabricated solar cell devices in a variety of architectures, with current-voltage curve measured efficiency up to 2.9% for a planar heterojunction architecture, and stabilised power conversion efficiency of 1.7%. The well-functioning planar junction devices demonstrate long-range electron and hole transport in this material. Importantly, this work identifies that the organic cation is not essential, but simply a convenience for forming lead triiodide perovskites with good photovoltaic properties. We additionally observe significant rate-dependent current-voltage hysteresis in CsPbI3 devices, despite the absence of the organic polar molecule previously thought to be a candidate for inducing hysteresis via ferroelectric polarisation. Due to its space group, CsPbI3 cannot be a ferroelectric material, and thus we can conclude that ferroelectricity is not required to explain current-voltage hysteresis in perovskite solar cells. Our report of working inorganic perovskite solar cells paves the way for further developments likely to lead to much more thermally stable perovskite solar cells and other optoelectronic devices.