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研究生:江健榕
研究生(外文):Cheng-Jung Chiang
論文名稱:非完美對苯乙烯結構之能帶及高分子發光二極體的元件模擬
論文名稱(外文):The Band Structure of PPV with Defects and PLED Device Simulation with Traps.
指導教授:孟心飛
指導教授(外文):Hsin-Fei Meng
學位類別:碩士
校院名稱:國立交通大學
系所名稱:物理研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:42
中文關鍵詞:對苯乙烯高分子發光二極體元件模擬
外文關鍵詞:PPVDefectsPLED Device SimulationTraps
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共軛高分子是一種具有廣泛潛力應用在發光,顯示器,等各領域的材質.因為其可彎曲,製程優勢,因此引起科學家廣泛的研究.現在仍然面臨很多難題.其中之一就是電子傳導的困難,或是說電子的傳導能力比電洞差三個order.
此篇論文提出造成此現象的可能原因,並從能帶的觀點證明之.我也做了一些以此材料為主的發光二極體元件模擬,希望能預測一下未來這種裝置的物理現象.

The conjugated polymer has a great potential to be applied in light-emitting diode in the future because the low cost of processing and mechanical flexibility. But for now, it also has a well-known problem that is asymmetric in transport for electrons and holes. Researchers put every effort in vain to improve the mobility of electrons by purifying the sample as best as they can. We find that one of the natural qualities of PPV, it’s p-doped upon producing, might be the major reason that reduces the mobility of the electrons. I study this phenomenon from the energy band first, and then see how the traps will affect the transport from device simulation. Different electron-hole recombination regions with different trap density and applied bias are obtained from the simulation.

I.Introduction 5
II.The Energy Band of a Single PPV Chain with Defects 9
(A).The structure of a conjugated polymer--------------------9
(B).The electron wave function-------------------------------10
(C).The Determination of Energy Levels in PPV by LCAO Method 10
(D).Result---------------------------------------------------14
(E). The Transition Rate under Interaction with Classical Radiation Field----------------------------------------------18
(F). Summary-------------------------------------------------21
III.The Device Simulation of Effects of Defect traps on Polymer Light-Emitting Diodes (PLED) 22
(A). Equation------------------------------------------------23
(B). The determination of trapped electron density-----------24
(C). The boundary condition----------------------------------26
(D). Result--------------------------------------------------27
IV. Discussion and Conclusion 39

[1] Alan J. Heeger Review of Modern Physics Volume 75, July 2001
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New York Academic
[10] Paul W. M. Blom and J. M. de Jong, Electrical Characterization of Polymer Light-Emitting Diodes IEEE Journal of Selected Topics in Quantum Electronics, Vol. 4, No.1, January 1998
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