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Electrostatic Tuning of Spray-Deposited ZnO for Controlled Mobility Enhancement

机译：静电沉积喷涂ZnO的调谐以控制迁移率

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摘要

Spray-deposited nanocrystalline ZnO films are produced in order to establish empirical relationships between synthetic conditions and the density of states as a means of achieving electrostatic control. By varying the spray-pyrolysis deposition conditions, i.e., substrate temperature, precursor concentration, and flow rate, a wide range of exponentially distributed density of localized states profiles and field-effect mobility values ranging over three orders of magnitude (0.02-30 cm(2) V-1 s(-1)) are obtained for analysis. It is found that mobility can be controlled by appropriately tuning the shape of the density of states profile, increasing the band tail slope and reducing the band edge concentration of shallow states. Most significantly, it is shown that the shape of the density of states can be modified by adjusting the spray-pyrolysis deposition conditions for electrostatic control. It is found that higher Zn precursor concentration in solution increases the slope of the band tails, leading to higher mobility. Additionally, the band edge concentration is reduced with increased substrate temperature also leading to higher mobility. These results quantify the relationship between defect electrostatics and electron transport while demonstrating electrostatic control via synthetic modification of localized states.
机译：为了建立合成条件和状态密度之间的经验关系，作为生产静电控制的手段，生产了喷涂沉积的纳米晶态ZnO薄膜。通过改变喷雾热解沉积条件，即基板温度，前驱物浓度和流速，可以在三个数量级（0.02-30 cm（ 2）获得V-1 s（-1））进行分析。发现可以通过适当地调整状态密度分布的形状，增加带尾斜率和减小浅状态的带边缘浓度来控制迁移率。最重要的是，表明可以通过调节用于静电控制的喷雾热解沉积条件来改变状态密度的形状。发现溶液中较高的Zn前体浓度会增加带尾的斜率，从而导致较高的迁移率。另外，随着衬底温度的升高，带边缘浓度降低，这也导致更高的迁移率。这些结果量化了缺陷静电与电子传输之间的关系，同时证明了通过局部状态的合成修饰实现静电控制。

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