Linking microscale morphologies to localised performance in singlet fission quantum dot photon multiplier thin films
Linking microscale morphologies to localised performance in singlet fission quantum dot photon multiplier thin films
复制标题
将微尺度形态与单线裂变量子点光子倍增器薄膜的局部性能联系起来
DOI：
10.1039/d2tc00677d
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发表时间：
2022
影响因子：
6.4
通讯作者：
Toolan D
中科院分区：
文献类型：
--
作者：
Toolan D
混合小分子/量子点薄膜有可能减少单结光子倍增器件中的热化损失。在这里，掠入射X射线散射，光学显微镜和红外荧光显微镜（在两个不同的波长探测材料），提供了新的洞察高度复杂的形态跨越nm和μm的长度尺度，提供形态和光子倍增性能之间的直接联系。结果表明，在小分子微晶内，可以识别出三种不同的QD形态;（i）在微晶核处的大量子点聚集体，（ii）相对良好分散的量子点，以及（iii）随着聚集的量子点从生长的微晶“扫掠”，并且包含聚集量子点特征的区域导致相对差的光子倍增性能。这些结果建立了如何散射和显微镜的组合，可以用来揭示新的见解的结构和功能的小分子：量子点共混物。
Hybrid small-molecule/quantum dot films have the potential to reduce thermalization losses in single-junction photovoltaics as photon multiplication devices. Here grazing incidence X-ray scattering, optical microscopy and IR fluorescence microscopy (probing materials at two distinct wavelengths), provide new insight into highly complex morphologies across nm and μm lengthscales to provide direct links between morphologies and photon multiplication performance. Results show that within the small molecule crystallites three different QD morphologies may be identified; (i) large quantum dot aggregates at the crystallite nucleus, (ii) relatively well-dispersed quantum dots and (iii) as aggregated quantum dots “swept” from the growing crystallite and that regions containing aggregate quantum dot features lead to relatively poor photon multiplication performance. These results establish how combinations of scattering and microscopy may be employed to reveal new insights into the structure and function of small molecule:quantum dot blends.