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Phase-Stable and Highly Luminescent CsPbI3 Perovskite Nanocrystals with Suppressed Photoluminescence Blinking
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-06-17 , DOI: 10.1021/acs.jpclett.2c01463
Sumanta Paul 1 , Anunay Samanta 1
Affiliation  

Despite their low band gap, the utility of CsPbI3 nanocrystals (NCs) in solar photovoltaic and optoelectronic applications is rather limited because of their phase instability and photoluminescence (PL) intermittency. Herein we show that phase-pure, monodispersed, stable and highly luminescent CsPbI3 NCs can be obtained by tweaking the conventional hot-injection method employing NH4I as an additional precursor. Single-particle studies show a significant suppression of PL blinking. Among all NCs studied, 60% exhibit only high-intensity ON states with a narrow distribution of intensity. The remaining 40% of NCs exhibit a much wider distribution of PL intensity with a significant contribution of low-intensity OFF states. Excellent characteristics of these CsPbI3 NCs are shown to be the result of NH4+ replacing some surface Cs+ of an iodide-rich surface of the NCs. These phase-stable and highly luminescent CsPbI3 NCs with significantly suppressed PL blinking can be useful single-photon emitters and promising materials for optoelectronic and solar photovoltaic applications.

中文翻译:

具有抑制光致发光闪烁的相稳定和高发光 CsPbI3 钙钛矿纳米晶体

尽管带隙低,但由于其相位不稳定性和光致发光 (PL) 间歇性,CsPbI 3纳米晶体 (NC) 在太阳能光伏和光电应用中的效用相当有限。在这里,我们表明,通过调整使用 NH 4 I 作为附加前体的传统热注射方法,可以获得相纯、单分散、稳定和高发光的 CsPbI 3 NCs。单粒子研究显示 PL 闪烁显着抑制。在所有研究的 NC 中,60% 仅表现出高强度 ON 状态,强度分布窄。其余 40% 的 NC 表现出更广泛的 PL 强度分布,其中低强度关闭状态的贡献显着。这些 CsPbI 的优良特性3 NCs 显示为NH 4 +取代了NCs 的富含碘化物表面的一些表面Cs +的结果。这些具有显着抑制 PL 闪烁的相稳定且高度发光的 CsPbI 3 NC 可以成为有用的单光子发射器和有前途的光电和太阳能光伏应用材料。
更新日期:2022-06-17
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