Technology Trends of Organic Devices Organic Semiconductor Lab. Yongju Park

Contents Concepts of Organic Device Flexible and Printable Materials Conclusion

Organic Materials Organic materials are new class of electronic materials which can be achieved from environment. Organic materials can be seen from colorful fruits and vegetables. Beta Carotene is a main organic materials. - And someone found that if we can extract this materials then we can make conducting polymers from this organic materials. - And of course organic materials can be obtained from environment so they are more eco-friendly and safe to human body.

Organic Materials These are organic materials we can use. These are divided into 2 classes mainly. One is the Donor can give electron and another is the Acceptor received electron more. And this guy is Alan J. Heeger, the winner of a Nobel Prize in Chemistry 2000, who invented organic conducting polymers.

Why organic ? Organic Devices Cheap, Simple Process, and Flexible But Low Eff. Low Stability Organic materials have some advantages than inorganic materials. We can produce more organic devices cheaper than inorganic devices because making processes are more easier and simple. And we can also make devices flexible so we can make alternative forms of display or solar cells. But until now, efficiency are lower and stability which can be withstood in the air atmosphere are lower either than inorganic semiconductors.

Organic Device? OLED Solar Cell Organic Devices mean which use organic polymer materials inside the devices. - And we can divide organic polymer devices into 3 parts. OLED, OTFT, Solar cells. Especially as we put conducting polymers as active layers inside the devices in OLED or OPV, these can make devices to obtain light from electricity like OLED or electricity from the sunlight like OPV.

Organic Photovoltaic Cell Donor Acceptor Anode Cathode + - Hole transport Hole extraction Electron transfer This picture shows brief processes of photovoltaic cells to make electricity. Actually Solar cell is a simple diode. If the sunlight comes from, then sunlight divided into 2 parts, electron and hole, then they are collected by each electrode. Electron to cathode, holes to anode. Organic solar cell are same but main difference is we use organic polymer as a active layer which divide sunlight to electron and hole. And they are some kinds of OPV cells which are flexible.

Making Process This is a also making process listed by step by step.

Generation Capacity This is a map of the USA which is well known a country that consumes electricity most in the world. But if we can use some solar cell areas like this red square box, we can make enough electricity more than 3TW that USA needs everyday, supposing efficiency of organic solar cell become higher than 10%.

Organic Lighting Electrode Diode Cathode Light - － ETL This picture shows Organic Lighting Electrode Diode which can make more clear and correct color we need than other device. Also LED is a different kind of a simple diode. Which makes the colorful light to combine electrons from cathode and holes from anode each. Organic conducting polymers work as emission Layer of OLED which make lights. - EML Anode Cathode HTL HTL ＋ EML Anode + + ETL Light

Contents Concepts of Organic Device Flexible and Printable Materials Conclusion - Until now, I show you brief idea of organic semiconductor. And I will show you future leading technology of display and OPV Cells.

Key Issues Technology In order to develop the future technology, 4 factor are required.

Flexible Materials : Comparison First of all, Materials are most important to make flexible devices and here are the 6 factors we need to make devices flexible. First, many technologies based on ITO glasses can achieve conductivity, transparency and thermal stability. But the other factors, processibility, flexibility and cost competition are worse. ITO film electrode is better. But this is not fully adoptable flexible materials neither. But as we use organic electrode we can achieve main factors to make flexible devices supposing that organic materials become more endurable to high temperature.

Flexible Electronics : Devices As I mentioned before flexibility is a main advantage of organic devices. Because organic material itself can be printed easily and electric circuits printed on bendable substrates like plastic and PES, or paper encourages flexible technology can be developed. So we can make flexible displays like small TV shaped like books based on organic and flexible technology.

Flexible Device : Applications The Glass for beverages is exchanged for light metal or plastic nowadays. And also we can expect, many electronics can be changed to be flexible using this printed OTFT electronic circuits on PET.

Flexible display & OPV : Applications This shows real applications of flexible electronics. - So if rigid panel become flexible, then we can round display up to arm or many places.

Printable Methods : Process Last issue is a process. Flexible device can be obtained by using printable process like brush method, spray deposition method. - As we make plastic substrate we can get more slim and light device. And rollable device can make device easy to carry or store. And R2R process can make large area devices more easily.

Printing Method : Process - And this is printing method. Supposing material’s characteristics are totally different from each materials. So we can choose right process to each materials.

Roll to Roll Process This is a R2R process which can make large area of organic devices more easily at short time. It combines some printable technology like spray, spin coating etc.

Contents Concepts of Organic Device Flexible and Printable Materials Conclusion

Future Market This is the conclusion. Printable and organic devices market share are increasing every year. And this is the future leading technology. So we always consider the way of our technology can be combined into flexible and organic technology.

Thank You - This is end of my presentation.