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Cd-Rich Alloyed CsPb1- x Cd x Br3 Perovskite Nanorods with Tunable Blue Emission and Fermi Levels Fabricated through Crystal Phase Engineering.
Advanced Science ( IF 15.1 ) Pub Date : 2020-06-17 , DOI: 10.1002/advs.202000930
Jie Guo 1 , Yuhao Fu 2 , Min Lu 1 , Xiaoyu Zhang 3 , Stephen V Kershaw 4 , Jia Zhang 1 , Shulin Luo 3 , Yanxiu Li 4 , William W Yu 5 , Andrey L Rogach 4 , Lijun Zhang 3 , Xue Bai 1
Affiliation  

One‐dimensional semiconductor nanostructures have already been used for a variety of optoelectronic applications. Metal halide perovskites have emerged in recent years as promising high‐performance optoelectronic materials, but reports on 1D nanorods (NRs) of all‐inorganic halide perovskites are still scarce. This work demonstrates a synthetic strategy toward cesium‐based inorganic perovskite NRs by exploiting composition‐controlled crystal phase engineering. It is accomplished for Cd‐rich mixed‐cation CsPb1‐x Cdx Br3 nanocrystals, where the initial 1D hexagonal perovskite phase drives the growth of the 1D NRs, as supported by first‐principles calculations. The band gaps of the resulting NRs are tunable by varying the Cd‐content, and the highly uniform CsPb0.08Cd0.92Br3 NRs (with an average length of 84 nm and width of 16 nm) exhibit a true blue‐color emission centered at 460 nm, with a high quantum yield of 48%. Moreover, this work also demonstrates the tunability of the Fermi levels in the films made of CsPb1‐x Cdx Br3 alloyed nanocrystals, where samples with highest Cd content show an increase of the electron concentration and a related increase in the conductivity.

中文翻译:

通过晶相工程制造的具有可调蓝光发射和费米能级的富镉合金 CsPb1- x Cd x Br3 钙钛矿纳米棒。

一维半导体纳米结构已用于各种光电应用。近年来,金属卤化物钙钛矿作为一种有前途的高性能光电材料而出现,但有关全无机卤化物钙钛矿的一维纳米棒(NR)的报道仍然很少。这项工作展示了一种通过利用成分控制晶相工程来合成铯基无机钙钛矿天然材料的策略。这是针对富含 Cd 的混合阳离子 CsPb 1- x Cd x Br 3纳米晶体实现的,其中初始的一维六方钙钛矿相驱动一维 NR 的生长,这一点得到了第一原理计算的支持。所得NR的带隙可通过改变Cd含量来调节,高度均匀的CsPb 0.08 Cd 0.92 Br 3 NR(平均长度为84 nm,宽度为16 nm)呈现出以中心为中心的真正蓝色发射。 460 nm,量子产率高达48%。此外,这项工作还证明了由 CsPb 1- x Cd x Br 3合金纳米晶体制成的薄膜中费米能级的可调性,其中具有最高 Cd 含量的样品显示出电子浓度的增加以及电导率的相关增加。
更新日期:2020-08-05
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