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Enhancement of hole mobility in lead sulfide nanoparticle doped polymer.

机译：硫化铅纳米粒子掺杂聚合物中空穴迁移率的增强。

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摘要

In recent years there has been increasing interest in the applications of hybrid organic-inorganic materials in electrical devices such as solar cells, photo detectors, field-effect transistors, light-emitting diodes etc. One of the promising composite structures which have been found useful for such application is a heterogeneous mixture of a polymer and semiconductor nanoparticles (quantum dots). The advantage of such a structure is that the optical properties of the quantum dots, which are related to the presence of quantum confinement, can be combined with good mechanical properties of the polymer, which can work both as a binder and as a matrix providing other electrical and optical functionalities.;In this thesis, we report that charge carrier mobility in poly(9-vinylcarbazole) (PVK) can be enhanced by doping it with lead sulfide (PbS) nanoparticles. This result is a new confirmation of the effect first observed on cadmium sulfide nanoparticles in PVK and it is discussed in terms of the previously proposed mean free path model1,2 as well as the band structure of the nanoparticles and its alignment with that of the host material. The mobility of holes (dominant carriers in the PVK host materials) was measured using the conventional time-of-flight technique with the injection of holes from a selenium layer. Though photocurrent transients exhibit features typical of dispersive transport in an amorphous semiconductor, certain deviations from the original Scher-Montroll theory are observed. Strong dependence of the carrier mobility on field and temperature indicate Poole-Frenkel-like activated hopping transport.
机译：近年来，人们越来越关注混合有机-无机材料在诸如太阳能电池，光电探测器，场效应晶体管，发光二极管等电子设备中的应用。已发现有用的有前途的复合结构之一用于这种应用的是聚合物和半导体纳米颗粒（量子点）的异质混合物。这种结构的优点是，与量子限制有关的量子点的光学性质可以与聚合物的良好机械性质相结合，该聚合物既可以用作粘合剂，也可以用作提供其他功能的基质。电气和光学功能。；在这篇论文中，我们报告说，通过掺杂硫化铅（PbS）纳米颗粒可以提高聚（9-乙烯基咔唑）（PVK）中的载流子迁移率。该结果是对首次观察到的对PVK中硫化镉纳米粒子的影响的新证实，并根据先前提出的平均自由程模型1,2以及纳米粒子的能带结构及其与主体的对准性进行了讨论。材料。空穴的迁移率（PVK主体材料中的主要载流子）是使用常规的飞行时间技术从硒层注入空穴来测量的。尽管光电流瞬变表现出非晶半导体中典型的色散传输特征，但观察到与原始Scher-Montroll理论的某些偏差。载流子迁移率对场和温度的强烈依赖性表明了类似于Poole-Frenkel的活化跳跃运输。

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  • 作者

    Singh, Rohit.;

  • 作者单位

    State University of New York at Buffalo.;

  • 授予单位 State University of New York at Buffalo.;
  • 学科 Chemistry Physical.;Engineering Materials Science.;Physics Condensed Matter.
  • 学位 M.S.
  • 年度 2009
  • 页码 67 p.
  • 总页数 67
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;工程材料学;
  • 关键词

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