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Title: | 小分子有機太陽能電池及非平面液晶元件結構之研究 Study of Small Molecular Organic Photovoltaic Device and Non-planar Liquid Crystal Device |
Authors: | Ya-Ting Yang 楊雅婷 |
Advisor: | 李君浩 |
Keyword: | 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, organic photovoltaic devices,planar-mixed heterojunction,PDMS,BEF,liquid crystal,non-planar,PDLC,contrast ratio,viewing angle, |
Publication Year : | 2013 |
Degree: | 碩士 |
Abstract: | 本篇論文第一部分旨要藉由合成的新施體材料藉由混和濃度調變及膜厚變化製備高效率之平面異質混和界面小分子有機太陽能電池元件。首先我們引入一新有機施體染敏化材料4-methyl-N-(4-(7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)phenyl)-N- p-tolylaniline (DTNPBO)及5-(7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)-N,N-dip- tolylthiophen-2-amine (DTNTBO),相較於一般施體材料,DTNPBO及DTNTBO具有較好的吸收效率且吸收波長在長波長550 - 700 nm的區段,並利用與受體材料碳60或碳70混合,經由適當的膜厚及混合比例調變後,其DTNPBO最佳化元件結構具有0.96 V之開路電壓和9.81 mA/cm2之短路電流,表現出5.27 %之功率轉換效率,而DTNTBO最佳化元件結構則具有0.89 V之開路電壓和12.4 mA/cm2之短路電流,表現出5.02 %之功率轉換效率。
第二部分,我們利用光學增亮膜及轉印技術成功製備出一新型非平面液晶結構,並且引入液晶聚合物混合薄膜(polymer dispersed liquid crystal, PDLC),由於結構的改變,可以提高暗態及亮態的對比度,實驗驗證下,發現不同的液晶結構,藉由入射角的改變,可以得到相近的光電參數;此外,藉由不同入射角的量測,證實非平面液晶結構可以增加視角,即使在入射角為70度的情況下該元件仍能運作。 第一章簡略敘述有機太陽能電池及液晶元件的演變與發展,並分別敘述其物理機制;第二章介紹元件架構與實驗所使用的儀器與原理;第三章及第四章則分別討論有機太陽能電池及液晶非平面元件的設計、表現及未來可研究的方向。 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. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/58851 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 光電工程學研究所 |
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