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Growth of mixed-halide perovskite single crystals
CrystEngComm ( IF 2.6 ) Pub Date : 2018-02-13 00:00:00 , DOI: 10.1039/c7ce01691c Wanfu Wang 1, 2, 3, 4, 5 , Jing Su 1, 2, 3, 4, 5 , Lei Zhang 1, 2, 3, 4, 5 , Yong Lei 1, 2, 3, 4, 5 , Di Wang 4, 6, 7, 8 , Di Lu 1, 2, 3, 4, 5 , Yu Bai 1, 2, 3, 4, 5
CrystEngComm ( IF 2.6 ) Pub Date : 2018-02-13 00:00:00 , DOI: 10.1039/c7ce01691c Wanfu Wang 1, 2, 3, 4, 5 , Jing Su 1, 2, 3, 4, 5 , Lei Zhang 1, 2, 3, 4, 5 , Yong Lei 1, 2, 3, 4, 5 , Di Wang 4, 6, 7, 8 , Di Lu 1, 2, 3, 4, 5 , Yu Bai 1, 2, 3, 4, 5
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In this paper, systematic halogen doping of CH3NH3PbI3−xBrx and CH3NH3PbBr3−yCly bulk single crystals that were grown in mixed organic solvents via the ITC (inverse temperature crystallization) method was performed. X-ray diffraction measurement results show that the lattice constants of CH3NH3PbI3−xBrx and CH3NH3PbBr3−yCly crystals change linearly with the x(y) values. For the CH3NH3PbI3−xBrx crystals, cubic to tetragonal phase transformation was observed where the iodine content reaches a certain level. The comparison of UV-vis-NIR absorption and PL spectra of CH3NH3PbI3−xBrx and CH3NH3PbBr3−yCly crystals shows that their absorption coefficients are contributed by direct and indirect bandgap transitions. Three kinds of mechanisms were involved in their radiative recombination, including direct emission, indirect emission and direct–indirect coexisting emission. The CH3NH3PbI3−xBrx (x = 1.64, 2.39, 2.81, 2.9) crystals were considered to be indirect band gap materials, since their band edges can be divided into two regions by a turning point. TG analysis shows that the beginning decomposition temperature of CH3NH3PbI3−xBrx and CH3NH3PbBr3−yCly crystals decreases with increasing x(y) values. Research on CH3NH3PbI3−xBrx and CH3NH3PbBr3−yCly single crystals would be helpful to reveal the inherent properties of perovskite materials.
中文翻译：
混合卤化物钙钛矿单晶的生长
在本文中，进行系统的卤素掺杂CH 3 NH 3碘化铅3- X溴X和CH 3 NH 3 PbBr 3- ý氯ý培养在混合有机溶剂中的是块状单晶经由所述ITC（逆温度结晶）进行方法。X射线衍射测定结果表明，CH的晶格常数3 NH 3碘化铅3- X溴X和CH 3 NH 3 PbBr 3- ÿ氯ÿ晶体随x（y）值线性变化。对于CH 3 NH 3 PbI 3- x Br x晶体，在碘含量达到一定水平时，观察到立方到四方相变。UV-VIS-NIR吸收和CH的PL光谱的比较3 NH 3碘化铅3- X溴X和CH 3 NH 3 PbBr 3- ÿ氯ÿ晶体显示它们的吸收系数是由直接和间接带隙跃迁贡献的。它们的辐射复合涉及三种机制，包括直接发射，间接发射和直接-间接共存发射。CH 3 NH 3 PbI 3- x Br x（x = 1.64，2.39，2.81，2.9）晶体被认为是间接带隙材料，因为它们的带边缘可以通过转折点分为两个区域。TG分析表明CH 3 NH 3 PbI 3− x Br x和CH 3 NH 3的开始分解温度PbBr 3- y Cl y晶体随着x（y）值的增加而减小。对CH 3 NH 3 PbI 3− x Br x和CH 3 NH 3 PbBr 3− y Cl y单晶的研究将有助于揭示钙钛矿材料的固有特性。
更新日期：2018-02-13
中文翻译：
混合卤化物钙钛矿单晶的生长
在本文中，进行系统的卤素掺杂CH 3 NH 3碘化铅3- X溴X和CH 3 NH 3 PbBr 3- ý氯ý培养在混合有机溶剂中的是块状单晶经由所述ITC（逆温度结晶）进行方法。X射线衍射测定结果表明，CH的晶格常数3 NH 3碘化铅3- X溴X和CH 3 NH 3 PbBr 3- ÿ氯ÿ晶体随x（y）值线性变化。对于CH 3 NH 3 PbI 3- x Br x晶体，在碘含量达到一定水平时，观察到立方到四方相变。UV-VIS-NIR吸收和CH的PL光谱的比较3 NH 3碘化铅3- X溴X和CH 3 NH 3 PbBr 3- ÿ氯ÿ晶体显示它们的吸收系数是由直接和间接带隙跃迁贡献的。它们的辐射复合涉及三种机制，包括直接发射，间接发射和直接-间接共存发射。CH 3 NH 3 PbI 3- x Br x（x = 1.64，2.39，2.81，2.9）晶体被认为是间接带隙材料，因为它们的带边缘可以通过转折点分为两个区域。TG分析表明CH 3 NH 3 PbI 3− x Br x和CH 3 NH 3的开始分解温度PbBr 3- y Cl y晶体随着x（y）值的增加而减小。对CH 3 NH 3 PbI 3− x Br x和CH 3 NH 3 PbBr 3− y Cl y单晶的研究将有助于揭示钙钛矿材料的固有特性。
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