Xu Shumao, Libanori Alberto, Luo Gan, Chen Jun
Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA 90095, USA.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
iScience. 2021 Feb 26;24(3):102235. doi: 10.1016/j.isci.2021.102235. eCollection 2021 Mar 19.
Potential multijunction application of CsPbI perovskite with silicon solar cells to reach efficiencies beyond the Shockley-Queisser limit motivates tremendous efforts to improve its phase stability and further enlarge its band gap between 1.7 and 1.8 eV. Current strategies to increase band gap via conventional mixed halide engineering are accompanied by detrimental phase segregation under illumination. Here, ethylammonium (EA) in a relatively small fraction ( < 0.15) is first investigated to fit into three-dimensional CsPbI framework to form pure-phase hybrid perovskites with enlarged band gap over 1.7 eV. The increase of band gap is closely associated with the distortion of Pb-I octahedra and the variation of the average Pb-I-Pb angle. Meanwhile, the introduction of EA can retard the crystallization of perovskite and tune the perovskite structure with enhanced phase stability and transport properties.
将 CsPbI 钙钛矿与硅太阳能电池进行潜在的多结应用，以实现超越肖克利 - 奎塞尔极限的效率，这促使人们付出巨大努力来改善其相稳定性，并进一步将其带隙扩大到 1.7 至 1.8 eV 之间。目前通过传统混合卤化物工程增加带隙的策略，在光照下会伴随着有害的相分离。在此，首次研究了相对少量（< 0.15）的乙胺（EA）融入三维 CsPbI 框架，以形成带隙扩大到 1.7 eV 以上的纯相混合钙钛矿。带隙的增加与 Pb - I 八面体的畸变以及平均 Pb - I - Pb 角的变化密切相关。同时，EA 的引入可以延缓钙钛矿的结晶，并调整钙钛矿结构，增强相稳定性和传输性能。
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