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MSE 542 – Final Term Paper

Title: Organic Semiconductor for Flexible Electronics

Name: Chunhung Huang

Introduction:

An organic semiconductor is an organic compound that possesses similar

properties to inorganic semiconductors with hole and electron conduction layer and a

band gap.4 Organic semiconductors differ from other organic material in that the

molecules that they are made of have π conjugate bonds which allow electrons to move

via π-electron cloud overlaps. Conduction mechanisms for organic semiconductor are

mainly through tunneling, hopping between localized states, mobility gaps, and phonon-

assisted hopping.5 Like inorganic semiconductors, organic semiconductors can be doped

in order to change its conductivity. Although inorganic semiconductors such as silicon,

germanium and gallium arsenide have been the backbone of semiconductor industry, for

the past decade, demands for pervasive computing have led to a dramatic improvement in

the performance of organic semiconductor. Recently, organic semiconductors have been

used as active elements in optoelectronic devices such as organic light emitting diodes

(OLED), organic solar cells, and organic field effect transistors (OFET). There are many

advantages of using organic semiconductors, such as easy fabrication, mechanical

flexibility, and low cost. Organic semiconductors offer the ability to fabricate electronic

device at lower temperature and over large areas on various flexible substrate such as

plastic and paper. They can be processed using existing techniques used in

semiconducting industry as well as in printing industries such as roll-to-roll

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