Dissertation > Excellent graduate degree dissertation topics show

Syntheses and Device Characterization of Pentacene and Its Soluble Derivatives

Author: ZhangLiPan
Tutor: GuoYanChun
School: Zhengzhou University
Course: Medicinal Chemistry
Keywords: mobility on/off ratio pentacene pentacene derivative
CLC: R914
Type: Master's thesis
Year: 2007
Downloads: 143
Quote: 0
Read: Download Dissertation

Abstract


Organic conductors and semiconductors have been attracting widespread attention since that polyacetylene films were made from insulator to conductor though doping methods by science workers. The functional materials include organic polymer, organic small molecular and molecular crystal semiconductors, and their electrical and optical properties are gradually known and applied. Organic thin film transistors （OTFTs） are just made using the semiconductor properties of certain organic molecules.Organic thin film transistor is the fundamental element of the large scale integrated circuit, and arouses great interest for their good application prospects such as data storage, sensors, and so on. As the representative of organic semiconductor materials, pentacene has been attracting widespread attention and research for high mobilities and on/off ratios of its thin film transistors. Despite its promise, pentacene has the limitations of difficulties in fabrication process and the short service life due to its extremely poor solubility and instability in light and oxygen. In order to meet the requirements of device manufacture, it is necessary to design and synthesize new useful organic molecules with semiconductor properties.In the thesis, simultaneous in synthesizing pentacene of high quality, we try to improve its solubility and stability using proper chemical modification. Following the reported methodologies, we have synthesized pentacene of good semiconductor properties and five of its soluble derivatives taking 6,13-pentacenequinone as raw material:R: H, phenyl, 4-tert-butylphenyl, 4-methoxyphenyl, 1-naphthyl, 2-triisopropylsilyethynylThe series of new compounds have been all confirmed by IR and MS, and the effects of different substitute group were discussed. Moreover, thin film transistors based on pentacene and its several derivatives have been successfully fabricated, and their mobilities and on/off ratios have been studied. The results are that, based on pentacene the mobility reaches 0.7 cm2V-1S-1 and the on/off ratio 107-108, which have been approached or already achieved the best level reported at home and abroad, especially the on/off ratio, could completely meet the highest level reported by documents abroad.Our research indicates that the solubility of all of the derivatives has been well improved. Nevertheless, mobilities and on/off ratios of thin film transistors based on several derivatives are affected obviously due to the crystal packing structures correlated to their space structure of molecules.

Related Dissertations

  1. Reseach of Mobile IP Routing in Satellite Networks,TN929.5
  2. Margin of China's securities market stock trading,F832.51
  3. Research on Expanded Techniques of Mobile IP Bashed on NS2,TN929.5
  4. Study on Interface Properties of Synthesized Glycolipids and Their Mixed Membranes with DPPE,TB383.2
  5. Study on Mobility Management for IPv6-based Wireless Sensor Networks,TP212.9
  6. The Influence of Poly ADP-ribose Polymerase 1 (PARP-1) on HMGB1 Localization and Secretion in RAW264.7 Cell,R576
  7. Silicon substrate AlGaN / GaN heterostructure growth studies,TN304.05
  8. Survival and development of university graduates with no background investigation plight,G647.38
  9. The high-speed railway of slab track structure filling layer self - compacting concrete,U214.18
  10. Research on Mechanisms for Political Transition-a Contribution to Modernization Theory,D0
  11. Beijing, Tianjin and labor mobility characteristics and influencing factors analysis,F224
  12. Development of Measurement System for Charge Carrier Mobility Based on Virtual Instrument,TN304
  13. Endometriosis serum and tissue high mobility clusters B1 protein expression and mechanism of action,R711.71
  14. Singnificance of High-Mobility Group Box Chromosomal Protein-1 in Severe Acute Pancreatitis and the Protective Effect by Somatostatin Combined with Growth Hormone,R576
  15. Research and Implementation of Evaluation Mechanism-based Route Optimization in HMIPv6,TN929.5
  16. The Research on Strengthening the Liquidity Assessment of Life Insurance Using Insurance Rating,F842
  17. Research on the Social Mobility of the Rural Women in Qingdao,C913.68
  18. The Optimization on Macro Handover of Hierarchical Mobile IPv6,TN929.5
  19. Network of urban space and place,TU984.113
  20. Our Country Fluidity Surplus Difficult Position and Choice,F822
  21. HMIPv6 Formal Verification Research Based on Color Petri Nets,TN929.5

CLC: > Medicine, health > Pharmacy > Drug basic science > Medicinal Chemistry
© 2012 www.DissertationTopic.Net  Mobile