Photoluminescence of CdSe nanowires grown with and without metal catalyst
Photoluminescence of CdSe nanowires grown with and without metal catalyst
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使用和不使用金属催化剂生长的 CdSe 纳米线的光致发光
DOI：
10.1007/s12274-010-0089-2
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发表时间：
2011-04-01
期刊：
影响因子：
9.9
通讯作者：
Ferrari, Andrea C.
中科院分区：
文献类型：
--
作者：
Fasoli, Andrea;Colli, Alan;Ferrari, Andrea C.
我们展示了在使用和不使用金属催化剂的情况下通过气相合成的 CdSe 纳米线的温度和功率依赖性光致发光测量。与催化剂辅助的纳米线相比，无需催化剂生产的纳米线可以进行优化，以产生更高的量子效率、更窄且空间均匀的发射。在这两种情况下也发现能量低于带边的发射。通过在同一纳米线上结合空间分辨光致发光和电子显微镜，我们发现无催化剂纳米线表现出具有尖锐声子复制的低能峰，而对于催化剂辅助纳米线，低能发射与具有扩展形态缺陷的纳米结构的存在有关。
We present temperature and power dependent photoluminescence measurements on CdSe nanowires synthesized via vapor-phase with and without the use of a metal catalyst. Nanowires produced without a catalyst can be optimized to yield higher quantum efficiency, and narrower and spatially uniform emission, when compared to the catalyst-assisted ones. Emission at energies lower than the band-edge is also found in both cases. By combining spatially-resolved photoluminescence and electron microscopy on the same nanowires, we show that catalyst-free nanowires exhibit a low-energy peak with sharp phonon replica, whereas for catalyst-assisted nanowires low-energy emission is linked to the presence of nanostructures with extended morphological defects.