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Diammonium Cations in the FASnI3 Perovskite Structure Lead to Lower Dark Currents and More Efficient Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-05-24 00:00:00 , DOI: 10.1021/acsenergylett.8b00687 Weijun Ke 1 , Constantinos C. Stoumpos 1 , Ioannis Spanopoulos 1 , Michelle Chen 1 , Michael R. Wasielewski 1 , Mercouri G. Kanatzidis 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-05-24 00:00:00 , DOI: 10.1021/acsenergylett.8b00687 Weijun Ke 1 , Constantinos C. Stoumpos 1 , Ioannis Spanopoulos 1 , Michelle Chen 1 , Michael R. Wasielewski 1 , Mercouri G. Kanatzidis 1
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Hybrid halide perovskite solar cells with mixed cations demonstrate superior optical and electrical properties, especially for lead-based perovskite devices. Here, we report lead-free tin-based perovskite solar cells with diammonium cations, which can significantly improve the device performance. Formamidinium tin iodide (FASnI3) perovskite can incorporate propylenediammonium (PN) and trimethylenediammonium (TN) and retain its three-dimensional structure while at the same time providing better film morphology and optoelectronic properties. As a result, solar cell devices using FASnI3 absorbers mixed with 10% PN and 10% TN achieve higher power conversion efficiencies of 5.85% and 5.53%, respectively, compared to 2.53% of the pristine FASnI3 solar cell. This difference in device performance can be mainly attributed to the reduced leakage current, lower trap-state density, and reduced recombination, as evidenced by our dark current–voltage, space-charge-limited current, and impedance measurements. The results suggest that perovskite absorbers with mixed diammonium cations are beneficial in achieving high-performance perovskite solar cells.
中文翻译：
FASnI 3钙钛矿结构中的二价阳离子导致更低的暗电流和更高效的太阳能电池
具有混合阳离子的混合卤化物钙钛矿太阳能电池表现出优异的光学和电学性能，尤其是对于铅基钙钛矿器件。在这里，我们报道了具有二铵阳离子的无铅锡基钙钛矿太阳能电池，可以显着提高器件性能。甲钛碘化锡（FASnI 3）钙钛矿可以掺入丙烯二铵（PN）和三亚甲基二铵（TN）并保留其三维结构，同时提供更好的薄膜形态和光电性能。结果，与原始FASnI 3的2.53％相比，使用掺有10％PN和10％TN的FASnI 3吸收剂的太阳能电池器件分别实现了5.85％和5.53％的更高功率转换效率。太阳能电池。器件性能的这种差异主要归因于漏电流的降低，陷阱态密度的降低和重组的降低，我们的暗电流-电压，空间电荷限制电流和阻抗测量结果证明了这一点。结果表明，具有混合的二铵阳离子的钙钛矿吸收剂有利于获得高性能的钙钛矿太阳能电池。
更新日期：2018-05-24
中文翻译：
FASnI 3钙钛矿结构中的二价阳离子导致更低的暗电流和更高效的太阳能电池
具有混合阳离子的混合卤化物钙钛矿太阳能电池表现出优异的光学和电学性能，尤其是对于铅基钙钛矿器件。在这里，我们报道了具有二铵阳离子的无铅锡基钙钛矿太阳能电池，可以显着提高器件性能。甲钛碘化锡（FASnI 3）钙钛矿可以掺入丙烯二铵（PN）和三亚甲基二铵（TN）并保留其三维结构，同时提供更好的薄膜形态和光电性能。结果，与原始FASnI 3的2.53％相比，使用掺有10％PN和10％TN的FASnI 3吸收剂的太阳能电池器件分别实现了5.85％和5.53％的更高功率转换效率。太阳能电池。器件性能的这种差异主要归因于漏电流的降低，陷阱态密度的降低和重组的降低，我们的暗电流-电压，空间电荷限制电流和阻抗测量结果证明了这一点。结果表明，具有混合的二铵阳离子的钙钛矿吸收剂有利于获得高性能的钙钛矿太阳能电池。
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