Enhanced photovoltaic performance and stability with a new type of hollow 3D perovskite {en}FASnI(3).
Enhanced photovoltaic performance and stability with a new type of hollow 3D perovskite {en}FASnI(3).
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增强了使用新型的空心3D Perovskite {en} Fasni（3）的新型空心3D钙钛矿（3）的增强光伏性能和稳定性。
DOI：
10.1126/sciadv.1701293
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发表时间：
2017-08
期刊：
影响因子：
13.6
通讯作者：
Kanatzidis MG
中科院分区：
文献类型：
--
作者：
Ke W;Stoumpos CC;Zhu M;Mao L;Spanopoulos I;Liu J;Kontsevoi OY;Chen M;Sarma D;Zhang Y;Wasielewski MR;Kanatzidis MG
使用乙二铵和甲脒阳离子的高性能和稳定性良好的中空锡基钙钛矿太阳能电池。钙钛矿太阳能电池已经彻底改变了溶液可加工太阳能电池的制造。设备中铅的存在使得这项技术不那么有吸引力，钙钛矿中的替代金属正在被研究作为合适的替代品。我们展示了一种新型锡基钙钛矿吸收剂，它结合了乙二铵（en）和甲脒（FA），形成了新型的{en}FASnI3型材料。ASnI3的三维结构只有在甲基铵、FA和Cs阳离子的作用下才稳定，带隙可以用固溶体（如ASnI3−xBrx）来调节。我们表明，en可以作为一种新的a阳离子，能够在不需要固体溶液的情况下实现带隙的显着增加。本文引入了一种新的带隙调谐机制，该机制是由大量肖特基型缺陷引起的。此外，在结构中加入阳离子显著提高了锡基钙钛矿吸收剂的空气稳定性，并改善了光电性能。我们性能最好的FASnI3太阳能电池具有7.14%的最高效率，这是无铅钙钛矿电池的最高效率，并且在封装老化超过1000小时后仍保持96%的初始效率。我们的研究结果为提高锡基无铅钙钛矿太阳能电池的性能和稳定性提供了一种新的方法。
High-performance and good-stability hollow Sn-based perovskite solar cells using ethylenediammonium and formamidinium cations. Perovskite solar cells have revolutionized the fabrication of solution-processable solar cells. The presence of lead in the devices makes this technology less attractive, and alternative metals in perovskites are being researched as suitable alternatives. We demonstrate a new type of tin-based perovskite absorber that incorporates both ethylenediammonium (en) and formamidinium (FA), forming new materials of the type {en}FASnI3. The three-dimensional ASnI3 structure is stable only with methylammonium, FA, and Cs cations, and the bandgap can be tuned with solid solutions, such as ASnI3−xBrx. We show that en can serve as a new A cation capable of achieving marked increases in the bandgap without the need for solid solutions. The en introduces a new bandgap tuning mechanism that arises from massive Schottky style defects. In addition, incorporation of the en cation in the structure markedly increases the air stability and improves the photoelectric properties of the tin-based perovskite absorbers. Our best-performing {en}FASnI3 solar cell has the highest efficiency of 7.14%, which is achieved for a lead-free perovskite cell, and retains 96% of its initial efficiency after aging over 1000 hours with encapsulation. Our results introduce a new approach for improving the performance and stability of tin-based, lead-free perovskite solar cells.
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