Path-Dependent Morphological Evolution of Se–Te Mesostructures Prepared by Inorganic Phototropic Growth
Path-Dependent Morphological Evolution of Se–Te Mesostructures Prepared by Inorganic Phototropic Growth
复制标题
无机向光生长制备的Se-Te介观结构的路径依赖形态演化
DOI：
10.1021/jacs.0c09798
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发表时间：
2020
影响因子：
15
通讯作者：
Lewis, Nathan S.
中科院分区：
文献类型：
--
作者：
Hamann, Kathryn R.;Carim, Azhar I.;Meier, Madeline C.;Lewis, Nathan S.
在此，我们描述了一种路径相关的“历史”效应，其中在两步无机光致生长过程的第二步中产生的薄膜形态取决于已经在不同光刺激条件下首先生长的预先存在的结构。静态光照下产生的Se-Te具有高度各向异性的片层形态，特征间距与输入波长成正比。首先用短波长的光生长，然后用长波长生长，导致第二阶段的形态表现出在第一步生长过程中形成的片层的终止。第二步生长结束时的片层间距大于第一步的片层间距。相反，使用相同的输入波长，但顺序相反，不会改变特征间距，而只产生线性特征延伸。对模拟结构的光吸收结合实验数据的分析表明，历史效应和不对称的路径依赖是生长界面上突然出现的纳米光子过程的结果，该过程动态地塑造了光场，并在连续的反馈回路中指导了光沉积的形态演变。
We describe herein a path-dependent “history” effect wherein the film morphology generated in the second step of a two-step inorganic phototropic growth process depends on a preexisting structure that has been first grown under different optical stimulation conditions. Se–Te generated with static illumination exhibited a highly anisotropic lamellar morphology with a characteristic feature pitch proportional to the input wavelength. Growth using first a short wavelength of light, followed by growth using a longer wavelength, resulted in the second-stage morphology exhibiting termination of lamellae formed during the first growth step. The lamellar pitch at the end of the second growth step was larger than that effected in the first step. In contrast, use of the same input wavelengths but in the opposite order produced no change in the feature pitch but rather only linear feature extension. Analysis of light absorption in simulated structures, in tandem with the empirical data, indicated that the history effect and asymmetric path dependence are a result of emergent nanophotonic processes at the growth interface that dynamically shape the optical field and direct morphological evolution of the photodeposit in a continuous feedback loop.