Efficient Lead-Free Solar Cells Based on Hollow {en}MASnI3 Perovskites,Journal of the American Chemical Society

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Efficient Lead-Free Solar Cells Based on Hollow {en}MASnI3 Perovskites
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-10-06 , DOI: 10.1021/jacs.7b09018
Weijun Ke ₁ , Constantinos C. Stoumpos ₁ , Ioannis Spanopoulos ₁ , Lingling Mao ₁ , Michelle Chen ₁ , Michael R. Wasielewski ₁ , Mercouri G. Kanatzidis ₁

Affiliation

Tin-based perovskites have very comparable electronic properties to lead-based perovskites and are regarded as possible lower toxicity alternates for solar cell applications. However, the efficiency of tin-based perovskite solar cells is still low and they exhibit poor air stability. Here, we report lead-free tin-based solar cells with greatly enhanced performance and stability using so-called "hollow" ethylenediammonium and methylammonium tin iodide ({en}MASnI3) perovskite as absorbers. Our results show that en can improve the film morphology and most importantly can serve as a new cation to be incorporated into the 3D MASnI3 lattice. When the cation of en becomes part of the 3D structure, a high density of SnI2 vacancies is created resulting in larger band gap, larger unit cell volume, lower trap-state density, and much longer carrier lifetime compared to classical MASnI3. The best-performing {en}MASnI3 solar cell has achieved a high efficiency of 6.63% with an open circuit voltage of 428.67 mV, a short-circuit current density of 24.28 mA cm-2, and a fill factor of 63.72%. Moreover, the {en}MASnI3 device shows much better air stability than the neat MASnI3 device. Comparable performance is also achieved for cesium tin iodide solar cells with en loading, demonstrating the broad scope of this approach.

中文翻译：

基于空心{en}MASnI3钙钛矿的高效无铅太阳能电池

锡基钙钛矿具有与铅基钙钛矿非常相似的电子特性，被认为是太阳能电池应用中可能的低毒性替代品。然而，锡基钙钛矿太阳能电池的效率仍然较低，空气稳定性较差。在这里，我们报告了使用所谓的“空心”乙二铵和甲基碘化锡（{en}MASnI3）钙钛矿作为吸收剂的无铅锡基太阳能电池，其性能和稳定性大大提高。我们的结果表明，en 可以改善薄膜形态，最重要的是可以作为一种新的阳离子并入 3D MASnI3 晶格中。当 en 的阳离子成为 3D 结构的一部分时，会产生高密度的 SnI2 空位，从而导致更大的带隙、更大的晶胞体积、更低的陷阱态密度、和比经典 MASnI3 更长的载流子寿命。性能最佳的 {en}MASnI3 太阳能电池实现了 6.63% 的高效率，开路电压为 428.67 mV，短路电流密度为 24.28 mA cm-2，填充因子为 63.72%。此外，{en}MASnI3 设备显示出比纯 MASnI3 设备更好的空气稳定性。带有 en 负载的碘化铯锡太阳能电池也获得了可比的性能，证明了这种方法的广泛范围。

更新日期：2017-10-06

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