세미나안내

[2018 08 17] 특별세미나 _Prof. Taishi Takenobu (Nagoya University)

Functional devices based on electrochemically doped organic polymer films and transition metal dichalcogenide monolayers

관리자 | 2018.08.14 08:49 | 조회 851


Functional devices based on electrochemically doped

organic polymer films and transition metal dichalcogenide monolayers

 

 Date: 2018. 08. 17(Fri) , 17:00 ~ 18:15

 Place: Science Building, Room.202 Multimedia Room

 Speaker: Prof. Taishi Takenobu (Nagoya University)

Host of a Seminar: Prof. Unyong Jeong

Abstract:

 

Recently, we combined electrochemical doping technique with functional devices of several materials and we successfully maximized their device performance [1-14]. Here, we applied these techniques into organic polymer films and transition metal dichalcogenide monolayers.

Organic polymer films

Due to their low-temperature solution processability, compatibility with large-area deposition techniques, intrinsic robust mechanical properties and excellent light-emitting properties, organic polymer semiconductors possess great potential as functional thin-film devices, such as field effect transistors, thermoelectric energy conversion devices and light-emitting devices. Because of these unique advantages, organic polymer films are extremely suitable for future IoT technology and large-area high-performance devices are highly required. However, in most functional devices, fine tuning of carrier concentration is key technique and, still, it is very difficult for organic polymer films to control their carrier density precisely. Here, we applied electrochemical doping techniques into organic polymer films and realized unique functionalities, i) insulator-to-metal transition induced by electrochemical doping, ii) electrochemically optimized thermoelectric energy conversion efficiency in organic polymer films and iii) highly functionalized light-emitting electrochemical cells based on organic polymers.

Transition metal dichalcogenide monolayers

2D layered materials have attracted much attention for exploring new electronic, optoelectronic, and photonic applications. Particularly, direct bandgap and unique electronic structure in monolayer transition metal dichalcogenides (TMDCs) provides a platform for exploring novel optoelectronic functionalities and devices. One of the most interesting properties of TMDCs is topological features, such as a non-centrosymmetric two-dimensional crystal, strong spin-orbit interaction, non-zero Berry curvature and resulting spin-valley coupling. Actually, circularly polarized light emission has been demonstrated. However, the fabrication of TMDC light-emitting devices are still limited, and this fundamental barrier has made investigating electroluminescence (EL) properties of TMDCs inevitably difficult. To overcome this issue, we developed the electrochemical method to dope both holes and electrons, and proposed a simple approach to form p-n junction universally in TMDCs [1-8]. Here, we apply this method into various forms of TMDCs and performed robust circularly polarized EL emission, arising from spin-valley coupling in TMDCs. Our approach paves a versatile way for using TMDCs in discovering new functional optoelectronic devices.

[1] Nano Lett. 12, 4013, (2012). [2] Adv. Mater., 24, 4392 (2012). [3] APL 103, 23505 (2013). [4] ACS Nano. 8, 923 (2014). [5] Adv. Funct. Mater., 24, 3305 (2014). [6] ACS Nano. 8, 8582 (2014). [7] Nano Lett., 14, 6437-6442 (2014). [8] Nat. Commun., 7, 12356 (2016). [9] Adv. Mater. 28, 4111 (2016). [10] APL 109, 201107 (2016). [11] Adv. Mater. 29, 1606918 (2017). [12] Adv. Mater., 29, 1606392 (2017). [13] Adv. Funct. Mater., 28, 1706860 (2018). [14] Adv. Mater. 30, 1707627 (2018).

 

Dept. of MSE / BK21+





219개(1/11페이지)
세미나안내
번호 제목 글쓴이 조회 날짜
219 [2018 12 12] 정기세미나 11th 첨부파일 관리자 595 2018.12.10 09:12
218 [2018 12 05] 정기세미나 10th 첨부파일 관리자 611 2018.12.05 08:59
217 [2018 11 28] 정기세미나 9th 첨부파일 관리자 807 2018.11.26 09:36
216 [2018 11 21] 정기세미나 8th 첨부파일 관리자 879 2018.11.19 09:47
215 [2018 11 14] 정기세미나 7th 첨부파일 관리자 515 2018.11.12 09:09
214 [2018 11 08] 특별세미나 _Prof. Jongwook KIM ( 첨부파일 관리자 622 2018.11.06 09:13
213 [2018 11 07] 정기세미나 6th 첨부파일 관리자 466 2018.11.05 09:14
212 [2018 10 31] 정기세미나 5th 첨부파일 관리자 594 2018.10.26 13:41
211 [2018 10 17] 정기세미나 4th 첨부파일 관리자 676 2018.10.15 14:14
210 [2018 10 10] 정기세미나 3rd 첨부파일 관리자 655 2018.10.05 15:40
209 [2018 09 19] 정기세미나 2nd 첨부파일 관리자 927 2018.09.17 12:16
208 [2018 09 12] 정기세미나 1st 첨부파일 관리자 907 2018.09.10 09:23
207 [2018 09 05] 신소재공학과 특별세미나 관리자 822 2018.09.03 11:24
>> [2018 08 17] 특별세미나 _Prof. Taishi Takenob 첨부파일 관리자 852 2018.08.14 08:49
205 [2018 05 30] 정기세미나 13th (박찬경 교수 정년퇴임 기념 첨부파일 관리자 851 2018.05.28 09:16
204 [2018 05 23] 정기세미나 12th 첨부파일 관리자 719 2018.05.21 09:11
203 [2018 05 16] 정기세미나 11th 첨부파일 관리자 608 2018.05.14 09:37
202 [2018 05 11] 특별세미나 _Ph. D Haeshin Lee (K 첨부파일 관리자 647 2018.05.10 09:31
201 [2018 05 09] 정기세미나 10th 첨부파일 관리자 421 2018.05.08 09:07
200 [2018 05 04] 특별세미나 _Dr. Hyobin Yoo (Harv 첨부파일 관리자 559 2018.05.03 09:48