White Light Emission from Black Germanium
White Light Emission from Black Germanium
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DOI：
10.1021/acsphotonics.7b00214
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发表时间：
2017-06
期刊：
影响因子：
7
通讯作者：
S. Shinde;T. D. Dao;S. Ishii;Lie-Wei Nien;K. Nanda;T. Nagao
中科院分区：
文献类型：
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作者：
S. Shinde;T. D. Dao;S. Ishii;Lie-Wei Nien;K. Nanda;T. Nagao
我们证明了几乎完美的吸收和量子点介导的增强可见光发射的缺陷工程锗纳米锥或黑锗。金字塔结构的高分辨率3D光致发光（PL）成像阐明了缺陷及其发射的位置依赖性：在纳米金字塔尖端观察到更强的光致发光产率，这与尖端处的有效光纳米聚焦相关，其中Ge和表面氧化物（GeO 2）之间的界面处的缺陷密度和粗糙度也增加。此外，从这个GeO 2/Ge界面的可见光发射可以增强15倍，当CdTe量子点（QDs）吸附在GeO 2/Ge系统。我们的结构的增强的发光可以归因于金字塔结构的非凡的光捕获特性;强的反射效应，在纳米金字塔尖端处的显著缺陷形成，以及GeO 2缺陷和CdTe QD之间的异常共振能量转移。求婚的我
We demonstrate the nearly perfect absorption and quantum dots-mediated enhanced visible light emissions from defect engineered Ge nanopyramids or black germanium. High-resolution 3D photoluminescence (PL) imaging of the pyramid structure elucidated the position dependency of defects and their emission: Stronger photoluminescence yield was observed at the nanopyramid tips, which is correlated to the efficient light nanofocusing at the tips where increased defect density and roughness at the interface between Ge and surface oxide (GeO2) also takes place. Furthermore, the visible light emissions from this GeO2/Ge interface can be enhanced ∼15-fold when CdTe quantum dots (QDs) are adsorbed on the GeO2/Ge system. The enhanced luminescence of our structure can be attributed to the extraordinary light harvesting property of pyramid structure; strong antireflection effect, pronounced defect formation at the nanopyramid tips, and anomalous resonant energy transfer between GeO2 defects and CdTe QDs. The proposed me...