Unconventional route to dual-shelled organolead halide perovskite nanocrystals with controlled dimensions, surface chemistry, and stabilities
Unconventional route to dual-shelled organolead halide perovskite nanocrystals with controlled dimensions, surface chemistry, and stabilities
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DOI：
10.1126/sciadv.aax4424
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发表时间：
2019-11-01
期刊：
影响因子：
13.6
通讯作者：
Lin, Zhiqun
中科院分区：
文献类型：
--
作者：
He, Yanjie;Yoon, Young Jun;Lin, Zhiqun
在过去的几年里，高质量钙钛矿纳米晶体（PNC）的合成取得了快速进展。然而，尽管取得了令人印象深刻的进展，但国家统计局的稳定性仍然是一个重大挑战。可靠地提高PNC稳定性的能力，同时保持其各自的纳米尺寸，是支撑光电应用未来发展的关键一步。在这里，我们报告了一种制作双壳PNC的非传统策略（即，聚合物配位的钙钛矿/SiO2核/壳NC），对尺寸、表面化学和稳定性具有精确的控制。与传统方法形成鲜明对比的是，我们的策略依赖于利用明智设计的星状共聚物作为纳米反应器，以实现具有受控但可调的钙钛矿核直径、SiO2壳厚度和表面化学的核/壳NC的生长。因此，所得的聚合物栓系的钙钛矿/SiO2核/壳NC同时显示出显著改善的稳定性（即，胶体稳定性、化学组成稳定性、光稳定性、水稳定性），同时具有通过常规方法无法获得的吸引人的溶液加工性。
The past few years have witnessed rapid advances in the synthesis of high-quality perovskite nanocrystals (PNCs). However, despite the impressive developments, the stability of PNCs remains a substantial challenge. The ability to reliably improve stability of PNCs while retaining their individual nanometer size represents a critical step that underpins future advances in optoelectronic applications. Here, we report an unconventional strategy for crafting dual-shelled PNCs (i.e., polymer-ligated perovskite/SiO2 core/shell NCs) with exquisite control over dimensions, surface chemistry, and stabilities. In stark contrast to conventional methods, our strategy relies on capitalizing on judiciously designed star-like copolymers as nanoreactors to render the growth of core/shell NCs with controlled yet tunable perovskite core diameter, SiO2 shell thickness, and surface chemistry. Consequently, the resulting polymer-tethered perovskite/SiO2 core/shell NCs display concurrently a stellar set of substantially improved stabilities (i.e., colloidal stability, chemical composition stability, photostability, water stability), while having appealing solution processability, which are unattainable by conventional methods.