钝化
光致发光
钙钛矿(结构)
材料科学
微晶
量子效率
光电子学
薄膜
光谱学
分析化学(期刊)
纳米技术
化学
结晶学
图层(电子)
物理
冶金
有机化学
量子力学
作者
Dane W. deQuilettes,Susanne Koch,Sven Burke,Rajan K. Paranji,Alfred J. Shropshire,Mark E. Ziffer,David S. Ginger
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2016-07-29
卷期号:1 (2): 438-444
被引量:461
标识
DOI:10.1021/acsenergylett.6b00236
摘要
We study the effects of a series of postdeposition ligand treatments on the photoluminescence (PL) of polycrystalline methylammonium lead triiodide perovskite thin films.We show that a variety of Lewis bases can improve the bulk PL quantum efficiency (PLQE) and extend the average PL lifetime, ⟨τ⟩, with large enhancements concentrated at grain boundaries.Notably, we demonstrate thin-film PLQE as high as 35 ± 1% and ⟨τ⟩ as long as 8.82 ± 0.03 μs at solar equivalent carrier densities using tri-n-octylphosphine oxide-treated films.Using glow discharge optical emission spectroscopy and nuclear magnetic resonance spectroscopy, we show that the ligands are incorporated primarily at the film surface and are acting as electron donors.These results indicate it is possible to obtain thinfilm PL lifetime and PLQE values that are comparable to those from single crystals by control over surface chemistry.
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