Antimony doped lead-free double perovskites (Cs2NaBi1−xSbxCl6) with enhanced light absorption and tunable emission,Journal of Materials Chemistry C

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Antimony doped lead-free double perovskites (Cs2NaBi1−xSbxCl6) with enhanced light absorption and tunable emission
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-08-25 , DOI: 10.1039/d0tc03003a
Shufang Wu _{1,

2,

3,

4,

5} , Wenbo Li _{1,

2,

3,

4,

5} , Junjie Hu _{1,

2,

3,

4,

5} , Peng Gao _{1,

2,

3,

4,

5}

Affiliation

Recently, compositional engineering of lead-free halide double perovskite materials (A₂B⁺B³⁺X₆) has attracted increasing research interest in terms of potential optoelectronic applications. Herein, antimony (Sb³⁺) ions are introduced to manipulate the structure and optical properties of Cs₂NaBiCl₆. Within the substitution range of 30%, the alloyed Cs₂NaBi_1−xSb_xCl₆ crystals maintain the pure double perovskite phase while exhibiting a gradually decreasing band-gap. Through controlled oxidation of Sb³⁺ ions, the samples, even at low alloy levels, show enhanced visible light absorption. An apparent color change from yellow to brown can be observed and ascribed to the increase of defect states. Meanwhile, the emissions of Cs₂NaBi_1−xSb_xCl₆ crystals turned gradually from the broad-band orange-red region to the blue-green region with the increase of the Sb³⁺ content. The dual-emission phenomenon can be attributed to the radiative recombination of self-trapping excitons activated by the excitation energy from the host lattice. This study augments the frontiers of halide double perovskites and deepens the understanding of optoelectronic tuning by atomic substitution. New possibilities in photovoltaics and white light emission applications could be envisioned.

中文翻译：

锑掺杂的无铅双钙钛矿（Cs2NaBi1-xSbxCl6）具有增强的光吸收和可调发射

最近，无铅卤化物双钙钛矿材料（A ₂ B ⁺ B ³⁺ X ₆）的成分工程在潜在的光电应用方面引起了越来越多的研究兴趣。在此，引入锑（Sb ³⁺）离子来操纵Cs ₂ NaBiCl ₆的结构和光学性质。在30％的取代范围内，合金化的Cs ₂ NaBi _{1- x} Sb _x Cl ₆晶体保持纯双钙钛矿相，同时带隙逐渐减小。通过控制Sb ^3+的氧化离子，即使在低合金水平下，样品也显示出增强的可见光吸收。可以观察到从黄色到棕色的明显颜色变化，并且归因于缺陷状态的增加。同时，随着Sb ³⁺的增加，Cs ₂ NaBi _{1− x} Sb _x Cl ₆晶体的发射逐渐从宽带橙红色区域变为蓝绿色区域。内容。双重发射现象可归因于由来自主晶格的激发能激活的自陷激子的辐射复合。这项研究扩大了卤化双钙钛矿的前沿领域，并加深了通过原子替代对光电子调谐的理解。可以设想在光伏和白光发射应用中的新可能性。

更新日期：2020-10-16

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