In situ tetrafluoroborate-modified MAPbBr3 nanocrystals showing high photoluminescence, stability and self-assembly behavior

In situ tetrafluoroborate-modified MAPbBr3 nanocrystals showing high photoluminescence, stability and self-assembly behavior
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原位四氟硼酸盐修饰的 MAPbBr3 纳米晶体表现出高光致发光、稳定性和自组装行为

DOI:
10.1039/c9tc04978a
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发表时间:
2020-02
影响因子:
6.4
通讯作者:
Li Wang
Li Wang
中科院分区:
材料科学2区
文献类型:
--
作者:
Xiao Yang;Fan Li;Xiaofeng Wang;Yifei Xu;Haoliang Wei;Li Wang

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在这项工作中,我们提出了一种简便有效的方案,即原位四氟硼酸盐修饰路线,通过将四氟硼酸盐直接引入到 LARP 过程中的前体溶液中来提高 CH3NH3PbBr3 (MAPbBr3) 纳米晶体的光致发光和稳定性。研究发现四氟硼酸盐的掺入可以控制 MAPbBr3 纳米晶体的光学性质和形貌。通过调节 BF4− 的量,获得了具有可调谐发射(480-525 nm)和高光致发光的 MAPbBr3 纳米晶体。同时,通过原位四氟硼酸盐修饰也可以大大提高MAPbBr3纳米晶的稳定性。更有趣的是,BF4−的引入可以诱导MAPbBr3纳米晶体的自组装晶体生长行为,表现出有序排列和定向自组装。如此惊人的结果主要归因于表面缺陷的钝化、稳定的有机-无机杂化配体层的存在以及原位掺入四氟硼酸盐时 BF4− 和 MA+ 之间氢键的形成。
In this work, we present a facile and effective protocol, the in situ tetrafluoroborate modification route, to improve the photoluminescence and stability of CH3NH3PbBr3 (MAPbBr3) nanocrystals by directly introducing tetrafluoroborate salts into the precursor solutions in the LARP process. It is found that the incorporation of tetrafluoroborate can control the optical properties and morphologies of the MAPbBr3 nanocrystals. By adjusting the amount of BF4−, the MAPbBr3 nanocrystals with tunable emission (480–525 nm) and high photoluminescence are acquired. Simultaneously, the stability of the MAPbBr3 nanocrystals can also be greatly improved via in situ tetrafluoroborate modification. More interestingly, the introduction of BF4− can induce the self-assembly crystal growth behavior of the MAPbBr3 nanocrystals, which exhibit orderly alignment and oriented self-assemblies. Such amazing results are primarily ascribed to the passivation of surface defects, the presence of a stable organic–inorganic hybrid ligand layer and formation of hydrogen bonding between BF4− and MA+ upon in situ incorporation of tetrafluoroborate.
混合阴离子钙钛矿CH3NH3PbI(3-x)(BF4)(x)无空穴导体完全可印刷介观太阳能电池
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