Energy Down-Conversion Cs3Cu2Cl5 Nanocrystals for Boosting the Efficiency of UV Photodetector
Energy Down-Conversion Cs3Cu2Cl5 Nanocrystals for Boosting the Efficiency of UV Photodetector
复制标题
用于提高紫外光电探测器效率的能量下转换 Cs3Cu2Cl5 纳米晶体
DOI：
10.3389/fmats.2021.682833
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发表时间：
2021-05-25
影响因子：
3.2
通讯作者：
Chen, Jing
中科院分区：
文献类型：
--
作者：
Liu, Chengjun;Wang, Lixi;Chen, Jing
零维卤化铅钙钛矿纳米晶（0-D）由于其优异的光致发光量子产率（PLQY）以及尺寸和成分可控的可调谐发射波长等特性，在光电器件领域引起了广泛的关注。然而，铅钙钛矿纳米粒子中铅（Pb）元素的毒性是制约其商业化应用的瓶颈。在本文中，我们报道了一种简便的配体辅助合成，以实现无铅Cs3 Cu 2Cl 5 NC，其具有类似于70%的高PLQY和对环境氧气/水分的良好稳定性，作为一种有前途的下转换材料。由于Jahn-Teller畸变效应和自陷激子效应，该材料具有高的PLQY和大的Stokes位移（接近300 nm）。此外，Cs3 Cu 2Cl 5纳米碳嵌入复合膜（NCCF）被用来增强硅（Si）光电探测器的紫外（UV）响应。外量子效率（EQE）测量表明，基于硅光电二极管的NCCF，在295 nm处的紫外响应可以从3.3%提高到19.9%。我们的工作为开发高效、稳定的无铅Cs 3Cu 2Cl 5纳米材料应用于日盲紫外光电探测器提供了一种有效的方法。
Zero-dimension (0-D) lead halide perovskite nanocrystals (NCs) have attracted a sight of interest in the field of optoelectronic devices due to their outstanding properties, such as high photoluminescence quantum yield (PLQY) and size- and composition-controlled tunable emission wavelengths. However, the toxicity of lead (Pb) element in the lead perovskite NCs is the bottleneck for the commercial application of perovskite NCs. Herein, we report a facile ligand-assisted synthesis to achieve lead-free Cs3Cu2Cl5 NCs with a high PLQY of similar to 70% and good stability against environmental oxygen/moisture as a promising down-conversion material. It has good merits of high PLQY and large Stokes shift (similar to 300 nm) originated from the effect of Jahn-Teller distortion and self-trapped excitons (STEs). Furthermore, the Cs3Cu2Cl5 NCs embedded composite films (NCCFs) were utilized to enhance the ultraviolet (UV) response of silicon (Si) photodetectors. External quantum efficiency (EQE) measurements show that the UV response can be greatly improved from 3.3 to 19.9% @ 295 nm based on NCCFs combined with Si photodiodes. Our work offers an effective approach to develop highly efficient and stable lead-free Cs3Cu2Cl5 NCs for the application in the solar-blind UV photodetector.