Optical Nonlinearity and Electronic Properties of Organic Semiconductors

• Main Authors: Lai, Chih-Ming, 賴志明
• Other Authors: Hsin-Fei Meng, Tzong-Jer Yang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/08927903665847917876

碩士 === 國立交通大學 === 電子物理學系 === 86 === This thesis focuses on three topics on the basic physics ofconjugated conducting polymers, which are: bipolaron- inducedoptical nonlinearity, a new bond order parameter, and conjugatedladder polymer with high dc conductivity. In the first topic, wepropose a new mechanism for optical nonlinearity taking advantageof the peculiar energy levels shift of bipolarons under optical pumping.In the second topic, we find that the configuration of a conjugated polymer chain is characterized by a new bond-length orderparameter, in addition to the well-known dimerization orderparameter. Based on this new order parameter, we predict, in the last topic, that the simplestladder polymer, polyacene, is a gapless semiconductor, with room temperature dc conductivity as high as one tenth of the conductivity of copper.