| 학회 |
한국재료학회 |
| 학술대회 |
2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 |
22권 2호 |
| 발표분야 |
E. 환경/센서 재료 분과 |
| 제목 |
All-Polymer Phototransistors: from Sensing Concepts to Applications in Flexible Systems |
| 초록 |
Sensing light (photons) is of crucial importance in our daily life as our eyes act to recognize objects around us. Eyes are already built in most animals including us, which can be a starting point to make artificial sensors - photosensors. The development of semiconductor technology has contributed greatly to the recent shape of 2D photosensors which are composed of single photosensing cells in a matrix array. Of various types of photosensors, phototransistors have been spotlighted because of their advantages in terms of signal amplification and active matrix driving capability. However, conventional phototransistors have an intrinsic limitation in both flexibility and large-area fabrication because they are made using inorganic materials that are rigid and need high processing temperatures. In order to meet the requirements for flexible and bendable electronic products such as smart phones etc., organic phototransistors are inevitably being considered due to their benefits including flexibility and low processing temperatures. In fact, most organic transistors can respond to light because organic materials in channel layers can absorb photons from ultraviolet (UV) to near infrared (NIR) regions. In this regard, organic phototransistors have been studied by several research groups but they were sticking to using single organic materials for the photosensing channel layers. As expected from the lesson on bulk heterojunction (BHJ) concept in organic solar cells, the single channel layers limit the sensitivity of organic phototransistors. In addition, organic small molecules cannot be fully flexible because their thin films are formed via weak van der Waals forces, which is one of the reasons leading to a burn-in degradation phenomenon in organic light-emitting displays (OLEDs), so that their durability is still in doubt upon bending. Hence our group has attempted to combine the BHJ concept with a polymer channel layer, leading to a “polymer:polymer” BHJ sensing channel layer. The resulting devices are so-called “all-polymer phototransistors”. In this presentation, the concept of all-polymer phototransistors is explained together with their sensing performances up to NIR light. If time is allowed, their applications in flexible systems will be shortly introduced. |
| 저자 |
Hyemi Han1, Sungho Nam2, Hwajeong Kim3, Youngkyoo Kim4
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| 소속 |
1화학공학과, 2경북대, 3Department of Physics, 4Univ. of Oxford |
| 키워드 |
<P>Photosensors; All-Polymer Phototransistors; Conjugated Polymers.</P>
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| E-Mail |
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