Study of Small Molecular Organic Photovoltaic Device and Non-planar Liquid Crystal Device
Date Issued
2013
Date
2013
Author(s)
Yang, Ya-Ting
Abstract
The first objective of this dissertation is to fabricate the planar-mixed heterojunction (PMHJ) small molecular organic photovoltaic (OPV) devices with new donor materials by engineering the mixing ratio and thickness of the device.
The high performance OPV device was fabricated by utilizing the new materials include 4-methyl-N-(4-(7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)phenyl)-N-p-tolylaniline (DTNPBO) and 5-(7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)-N,N-dip-tolylthiophen-2- amine (DTNTBO) mixed with fullerene (C60 or C70) as the active layer in the OPV device. Compared with the conventional donor materials, the absorption coefficient was increased and absorption region was at long wavelength around 550 - 700 nm, thus improved the device efficiency. The best performance of DTNPBO based OPV with the power conversion efficiency (PCE) of 5.27 % and a higher open circuit voltage (VOC), short circuit current density (JSC) and fill factor (FF) of 0.96 V, 9.81 mA/cm2, and 50.03 %, respectively; and DTNTBO based OPV with the PCE of 5.02 % and VOC, JSC and FF of 0.89 V, 12.4 mA/cm2, and 45.5 %, respectively.
The second objective of this dissertation is to fabricate a new type liquid crystal (LC) device use a non-planar structure. In our experiment, we fabricate the LC devices by brightness enhancement film (BEF) and polydimethylsiloxane (PDMS) and introduce polymer dispersed liquid crystals (PDLCs) to investigate for non-planar structure device. Here, we successfully fabricate non-planar device which device can improve the contrast ratio. Moreover, we observe the contrast ratio and the maximum and minimum of transmittance were similar between planar device under incidence angle was 0o and non-planar device incidence angle was 45o resulting from their optical path. Moreover, we demonstrated the non-planar PDLC device could improve viewing angle.
In this thesis, we first demonstrate the organic photovoltaic (OPV) device based on a 4-methyl-N-(4-(7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)phenyl)-N-p-tolylaniline (DTNPBO) or 5-(7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)-N,N-dip-tolylthiophen-2- amine (DTNTBO) / fullerene (C60 or C70)/ bathocuproine (BCP) planar-mixed heterojunction (PMHJ) structure with different hole transport layer (HTL) or thickness and combinations of Al as the cathode. Then, we demonstrate the liquid crystal device based on non-planar with prism sheet (also called brightness enhancement film, BEF) and polydimethylsiloxane (PDMS).
This dissertation is organized as follows. Part A and Part B describe OPV and LCD, respectively. Chapter 1 describes a brief overview of OPV device or LC device. Chapter 2 shows the fabrication and measurement systems. Chapter 3 and Chapter 4 describe the device design, performance, and future work of OPV device or LC device, respectively.
Subjects
有機小分子太陽能電池
平面異質混和界面
液晶
光學增亮膜
轉印技術
液晶聚合物混合薄膜
對比度
視角
SDGs
Type
thesis
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