Broadband Emission in Two-Dimensional Hybrid Perovskites: The Role of Structural Deformation

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• 作者：Daniele Cortecchia ; Stefanie Neutzner ; Ajay Ram Srimath Kandada ; Edoardo Mosconi ; Daniele Meggiolaro ; Filippo De Angelis ; Cesare Soci ; Annamaria Petrozza
• 刊名：Journal of the American Chemical Society
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：139
• 期：1
• 页码：39-42
• 全文大小：421K
• ISSN：1520-5126

文摘

Only a selected group of two-dimensional (2D) lead–halide perovskites shows a peculiar broad-band photoluminescence. Here we show that the structural distortions of the perovskite lattice can determine the defectivity of the material by modulating the defect formation energies. By selecting and comparing two archetype systems, namely, (NBT)₂PbI₄ and (EDBE)PbI₄ perovskites (NBT = n-butylammonium and EDBE = 2,2-(ethylenedioxy)bis(ethylammonium)), we find that only the latter, subject to larger deformation of the Pb–X bond length and X–Pb–X bond angles, sees the formation of V_F color centers whose radiative decay ultimately leads to broadened PL. These findings highlight the importance of structural engineering to control the optoelectronic properties of this class of soft materials.