Dr.He Yan 1月15日上午学术报告


报告人:He Yan (Henry)

        (Vice President, Polyera Corporation)


题目:   High-Performance Organic Electronic Materials From Material Design to Technology Development


时间:  2011115日(星期六)上午1000

地点: 910-208


This presentation will introduce some recent material developments in the areas of Organic Transistors and Organic Solar Cells at Polyera Corporation. For the area of Organic Transistors, it is highly desirable to have both p- and n-type organic semiconductors with high-performance to construct complimentary circuits (CMOS circuits), because CMOS circuits are at least 10x more powerful and efficient than single-polarity circuits. Although p-type organic semiconductors had already demonstrated impressive performance, the development of n-type organic semiconductors had been extremely slow and seriously limiting the development of Organic Transistor field. This presentation will introduce the first high-mobility (up to 0.8cm2/Vs) n-type polymeric semiconductor in the field of organic transistors. This n-type semiconductor not only exhibited excellent electrical characteristics comparable to state-of-art p-type semiconductors, it also had great air stability and good compatibility with various printing techniques. With these features, printed CMOS invertors were demonstrated with unprecedented performance. This development opened up tremendous opportunities of applications of organic materials in the Printed Electronics industry. Following this progress, Polyera developed another n-type semiconductor in 2010 with mobility about 3 cm2/Vs and exceptional bias stress stability at least 3000 hours under accelerated conditions. With such mobility and stability, organic transistor materials can be considered as a possible candidate of backplanes for AMOLED. For the area of Organic Solar Cells, there had been rapid progress of power conversion efficiency in the past two years from 5% to about 8%. An important approach to enhance Organic Solar Cell efficiency is to develop low band-gap polymers that have wide absorption in solar spectrum. This presentation will briefly introduce the general design rationales of low-band-gap polymers in the organic solar cell community, and discuss about the low-band-gap polymers developed at Polyera giving ~7.3% power conversion efficiency. In the last part, three short research proposals will be presented with the goal of achieving high-efficiency OPV. OPV has a few sub-areas: Dye-Sensitized Solar Cells, Polymer OPV, and small molecule OPV. The advantages and disadvantages of these different OPV technologies will be compared and the key problems in each area will be identified. The three proposals presented will be addressing key problems in these OPV areas. For example, the first proposal describes a new concept of Multi-Layer Dye-Sensitized Solar Cells, which should not only increase OPV efficiency significantly, but also offer a new chemical method to precisely control the key interfaces in Dye-sensitized solar cells. The second and third proposals will be about conducting polymers and antireflective coatings that will also benefit Inorganic Solar Cells as well as OPV.


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