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Opto-electrical studies of self-assembled monolayer diodes and bulk hetero-junction organic photovoltaic devices.

机译：自组装单层二极管和体异质结有机光伏器件的光电研究。

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摘要

The present dissertation is the result of our studies of the optical and electrical properties of self-assembled monolayer (SAM) diodes and bulk heterojunction organic photovoltaic(BOPV) devices.;In our studies of SAM diodes, we fabricated solid-state mixtures of two different kinds of molecules; 1,4 benzene-dimethane-thiol (MeBDT) and 1-pentanethiol (PT). By varying the concentration r of MeBDT with respect to PT, we can go from a regime of isolated molecular wires (10--8 < r 10-3).;For r = 0, we found that a potential barrier dominated the transport properties of the device. In the isolated molecules regime, the conductance of MeBDT dominates the transport. In this regime, because of the linearity of the conductance with respect to r, we were able to obtain a "single molecule resistance" at V = 0.1 V of RM = 6x 10--9 .;In the aggregated molecules regime, an ohmic response in the current-voltage (I-V) characteristics was observed for bias voltages ≤ 0.5V with the appearance of a new band in the differential conductance around V = 0 along with a new double band in the optical gap at 2.4eV resulting in yellow/red photoluminescence emission.;Opto-electrical studies of BOPV devices reveal that there are very few similarities between these types of solar cells and conventional solar cells. From simulations and experiemental measurements of the I-V characteristics, we found that while the open voltage circuit (Voc) is important for engineers, it carries no intrinsic information of the device. It cannot exceed the built-in potential of the device (Vbuilt--in ). The later origin was found to be dependent on electrode work function difference for a non-Ohmic contact configuration and on the active layer's blend in an Ohmic contact configuration. In a bid to improve BOPV device performance, we added to the blend spin 1/2 radical molecules. At concentration ( ≤2%), an increase in device performance was observed. The principal cause for this increase was the increase in the carrier's mobility as a function of the concentration of radicals.
机译：本文是我们对自组装单层（SAM）二极管和体异质结有机光伏（BOPV）器件的光学和电学性质进行研究的结果;在我们对SAM二极管的研究中，我们制造了两种固态混合物不同种类的分子； 1,4苯二甲硫醇（MeBDT）和1-戊硫醇（PT）。通过改变MeBDT相对于PT的浓度r，我们可以从孤立的分子线体系（10--8

著录项

  • 作者

    Ndobe, Alexandre.;

  • 作者单位

    The University of Utah.;

  • 授予单位 The University of Utah.;
  • 学科 Physics Theory.;Biophysics General.;Chemistry Physical.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 149 p.
  • 总页数 149
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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