This course focuses on organic semiconductor materials as large-area thin film semiconductors for imaging devices. Topics include the electrical properties of organic semiconductors i. e., electric conduction, carrier transport, and photo carrier generation in organic materials. The course enables students to understand how to choose the suitable materials for imaging devices such as xerography, organic light emitting diode, organic transistor, and organic thin film solar cell.
Much information flows in our life, today. In this course, at first, we discuss "What is information?", imaging process, and devices are necessary for human to recognize the information. The large-area thin film semiconductors are required for imaging devices such photoreceptor of laser printers, active matrix displays, and organic light emitting diodes. Electrical quality of organic materials is worse than that of inorganic materials such as silicon, however, the organic materials have some advantages, in fact, organic semiconductors are used as photoreceptor of xerography.
By the end of this course, students will be able to:
1) Understand the reason why large area thin film semiconductor is required for imaging devices.
2) Understand how to use the nature of organic materials for imaging devices such as xerography.
3) Understand basic properties of organic semiconductors.
4) Understand the relationship of chemical structure of organic semiconductors and characteristics as semiconductors.
imaging devices, large area thin film semiconductors, xerography, active matrix, organic semiconductors, hopping transport, transient photocurrent, space charge limited current, disorder model, onsager model, organic light emitting diode, organic transistor, organic thin film solar cells
|Intercultural skills||Communication skills||Specialist skills||Critical thinking skills||Practical and/or problem-solving skills|
Towards the end of class, students are given exercise problems related to the lecture given that day to solve. To prepare for class, students should read the course schedule section and check what topics will be covered. Required learning should be completed outside of the classroom for preparation and review purposes.
|Course schedule||Required learning|
|Class 1||What is information? -Information distribution technology and its materials-||Understand the necessary of imaging device large-area thin film semiconductor materials|
|Class 2||Imaging devices -Xerography-||Understand process of Xerography(Carlson method)|
|Class 3||Imaging devices -Liquid crystal display-||Understand necessary of active matrix display|
|Class 4||Thin film semiconductor materials and fabrication process||Understand thin film semiconductor materials and their fabrication process|
|Class 5||Electric conduction of organic materials||Understand carrier density and hopping transport in organic materials|
|Class 6||Evaluation method of carrier transport||Understand transient photocurrent measurement and space charge limited current|
|Class 7||Carrier transport properties in organic semiconductors -Amorphous materials-||Understand disorder model in organic amorphous materials|
|Class 8||Carrier transport properties in organic semiconductors -Crystalline materials-||Understand band and hopping transports in organic crystalline materials|
|Class 9||Carrier transport properties in organic semiconductors -Liquid Crystalline materials-||Understand the properties of liquid crystalline materials|
|Class 10||Organic semiconductor materials for xerography||Understand the requisition of organic semiconductor materials in xerography|
|Class 11||Photoconductivity and photo carrier generation in organic semiconductors||Understand the carrier generation of Onsager model|
|Class 12||Organic semiconductor materials for organic light emitting diode||Understand the requisition of organic semiconductor materials in organic light emitting diodes|
|Class 13||The mechanism of carrier injection from electrode to organic semiconductors||Understand contact between electrodes and organic semiconductors|
|Class 14||Organic semiconductor materials for organic transistors||Understand the requisition of organic semiconductor materials in organic transistors|
|Class 15||Organic semiconductor materials for organic thin film solar cell||Understand the requisition of organic semiconductor materials in organic thin film solar cells|
Course materials will be provided.
Course materials will be uploaded on OCW-i.
Paul M. Borsenberger and David S. Weiss. Organic photoreceptors for xerography. New York : Marcel Dekker; ISBN-9780824701734.
Students' knowledge of imaging devices and the properties of organic semiconductor materials will be assessed.
Report 70%, exercise problems 30%.