Resolving in-plane and out-of-plane mobility using time resolved microwave conductivity

Resolving in-plane and out-of-plane mobility using time resolved microwave conductivity
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使用时间分辨微波电导率解析面内和面外迁移率

DOI:
10.1039/d0tc00328j
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发表时间:
2020
影响因子:
6.4
通讯作者:
Labram, John G.
Labram, John G.
中科院分区:
材料科学2区
文献类型:
--
作者:
Chattopadhyay, Shirsopratim;Kokenyesi, Robert S.;Hong, Min Ji;Watts, C Lowell;Labram, John G.

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非接触表征技术时间分辨微波电导率(TRMC)提供了一种快速和明确的近似载流子迁移率和寿命的各种半导体材料的手段。然而,当使用基于腔的方法时,该技术传统上只能解析衬底平面中的载流子迁移率。在太阳能电池中,电荷载流子在垂直于衬底的方向上被提取,因此如果能够评估在该方向上的迁移率也将是有益的。在这里,我们提出了一种新的方法来解决样品中不同平面的载流子迁移率。使用一系列3D打印样品架,其中样品以相对于入射光的各种角度固定,我们能够同时解决样品平面内和样品平面外的迁移率。作为例子,我们研究了三维角连接的金属卤化物钙钛矿甲基铵碘化铅和二维钙钛矿前体碘化铅。
The contactless characterization technique time resolved microwave conductivity (TRMC) provides a means to rapidly and unambiguously approximate carrier mobilities and lifetimes for a variety of semiconducting materials. When using a cavity-based approach however, the technique can conventionally only resolve carrier mobilities in the plane of the substrate. In solar cells, charge carriers are extracted in the direction perpendicular to the substrate, therefore it would be beneficial if one were able to evaluate the mobility in this direction also. Here we present a novel approach for resolving charge carrier mobilities in different planes within a sample. Using a range of 3D-printed sample holders, where the sample is held at various angles relative to the incident light, we are able to simultaneously resolve the mobility in the plane of the sample and out of the plane of the sample. As examples, we have studied the 3-dimensional corner-connected metal halide perovskite methylammonium lead iodide and the 2-dimensional perovskite precusor, lead iodide.
通过时间分辨光电导测量分析纳米多孔系统中的载流子动力学
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