Modulation of Carrier Type in Nanocrystal-in-Matrix Composites by Interfacial Doping,Chemistry of Materials

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Modulation of Carrier Type in Nanocrystal-in-Matrix Composites by Interfacial Doping
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-04-02 00:00:00 , DOI: 10.1021/acs.chemmater.7b04689
Richa Sharma ₁ , April M. Sawvel ₁ , Bastian Barton ₁ , Angang Dong ₁ , Raffaella Buonsanti ₁ , Anna Llordes ₁ , Eric Schaible ₂ , Stephanus Axnanda ₂ , Zhi Liu ₂ , Jeffrey J. Urban ₁ , Dennis Nordlund ₃ , Christian Kisielowski ₁ , Delia J. Milliron _{1,

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Affiliation

Inorganic nanocomposites synthesized by combination of colloidal nanocrystals (NCs) and inorganic clusters have recently emerged as new materials with novel and unique functionalities. Much of the demonstrated promise of nanocomposites derives from the unique interactions between NC and matrix components—this generates new material properties, which direct unique transport behavior in the overall solid or nanocomposite—be it mass, charge, or heat. While measured empirically, it has remained largely impossible to take an a priori look at material properties and use those as a guideline to design desired transport behavior. Fundamentally, this is because the structural and electronic changes manifest at those interfaces have remained hidden from examination. Here, we provide experimental evidence that transport behavior in nanocrystal-in-matrix (NIM) composites is dictated primarily by interfacial charge transfer associated with electronic and structural reconstructions as the composite forms. Our approach building continuous composite superlattices serves as a starting point for systematic probing of the nanointerface of NIM composites via ultrathin films. A combination of field effect transistor device characterization and photoemission spectroscopy reveals the systematic dependence of the polarity of charge transfer on the selection of matrix materials in NIM composites. We use this insight to combine, by design, different components to tune the carrier type in NIM composites.

中文翻译：

界面掺杂对纳米晶基复合材料载流子类型的调控

由胶体纳米晶体（NCs）和无机团簇的组合合成的无机纳米复合材料近来作为具有新颖和独特功能的新材料出现。纳米复合材料的许多已证明前景来自于NC和基质组分之间的独特相互作用，这产生了新的材料特性，该特性指导着整个固体或纳米复合材料（无论是质量，电荷还是热量）的独特传输行为。虽然是凭经验进行测量，但在很大程度上仍然不可能先验一下材料的性能，并不能将其用作设计所需运输性能的准则。从根本上讲，这是因为那些界面上显示的结构和电子变化一直无法检查。这里，我们提供的实验证据表明，基体纳米晶体（NIM）复合材料中的传输行为主要受与电子和结构重建相关的界面电荷转移支配。我们建立连续复合材料超晶格的方法是通过超薄薄膜系统探测NIM复合材料纳米界面的起点。场效应晶体管器件的表征与光发射光谱的结合揭示了电荷转移极性对NIM复合材料中基体材料选择的系统依赖性。我们利用这种洞察力，通过设计组合不同的组件来调整NIM复合材料中的载流子类型。

更新日期：2018-04-02

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