Tunable optical properties and stability of lead free all inorganic perovskites (Cs2SnIxCl6−x)†,Journal of Materials Chemistry A

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Tunable optical properties and stability of lead free all inorganic perovskites (Cs2SnIxCl6−x)†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-01-02 00:00:00 , DOI: 10.1039/c7ta10040j
Weiguang Zhu _{1,

2,

3,

4,

5} , Guoqing Xin _{1,

2,

3,

4,

5} , Yiping Wang _{3,

4,

5,

6} , Xin Min _{7,

8,

9,

10,

11} , Tiankai Yao _{1,

2,

3,

4,

5} , Wenqian Xu _{5,

12,

13,

14,

15} , Minghao Fang _{7,

8,

9,

10,

11} , Sufei Shi _{3,

4,

5,

16,

17} , Jian Shi _{3,

4,

5,

6} , Jie Lian _{1,

2,

3,

4,

5}

Affiliation

Department of Mechanical
Aerospace and Nuclear Engineering
Rensselaer Polytechnic Institute
Troy
USA
Department of Materials Science and Engineering
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes
National Laboratory of Mineral Materials
School of Materials Science and Technology
China University of Geosciences (Beijing)
Beijing 100083
X-ray Science Division
Advanced Photon Source
Argonne National Laboratory
Lemont
Department of Chemical and Biological Engineering
Department of Electrical

Organic–inorganic hybrid lead-based perovskites experience significant environmental instability under ambient moist air and are not environmentally benign due to the usage of toxic Pb. Here, we report a new approach to synthesize lead-free all inorganic perovskites (Cs₂SnI_xCl_6−x) using hydriodic acid (HI) demonstrating greatly enhanced environmental stability and tunable optical properties by controlling the I⁻/Cl⁻ ratios. Single phase perovskites can be achieved with a low iodine or chlorine content, and a phase separation occurs in the binary system with closer iodine and chlorine dopings. UV-vis diffuse reflectance and photoluminescence measurements reveal tunable band gaps of Cs₂SnI_xCl_6−x perovskites from the UV to the infrared region. The mixed halide perovskite with a lower chloride content shows significantly higher photoluminescence intensity. The thermal stability of mixed halide all-inorganic perovskites is continuously improved as the Cl content increases. The synthesis of Sn-based perovskites with tunable optical properties and environmental stability represents one step further toward the realization of the stable lead-free all inorganic perovskites.

中文翻译：

无铅所有无机钙钛矿（Cs ₂ SnI _x Cl _{6− x}）的可调光学性质和稳定性†

有机-无机杂化铅基钙钛矿在环境潮湿空气中会经历明显的环境不稳定性，并且由于使用了有毒的铅而对环境无益。这里，我们报告一个新的方法来合成无铅所有无机钙钛矿（CS ₂ SNI _X氯_{-6- X}）使用由控制I氢碘酸（HI），这表明大大提高的环境稳定性和可调谐光学性质^- /氯^-比率。碘或氯含量低的钙钛矿可以实现单相钙钛矿的形成，在碘和氯掺杂较近的二元体系中会发生相分离。紫外可见漫反射和光致发光测量显示Cs ₂ SnI _x Cl ₆₋_x的可调节带隙钙钛矿从紫外线到红外区域。具有较低氯化物含量的混合卤化物钙钛矿显示出显着较高的光致发光强度。随着Cl含量的增加，混合卤化物全无机钙钛矿的热稳定性不断提高。具有可调光学性能和环境稳定性的Sn基钙钛矿的合成代表了向稳定的无铅所有无机钙钛矿实现进一步的一步。

更新日期：2018-01-02

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