세미나안내

[2017 07 06] 특별세미나 _Prof. Do Young Kim(Oklahoma State Univ.)

Multi-spectral photo-conversion devices using colloidal PbS nanocrystals

관리자 | 2017.07.03 10:23 | 조회 505


 

Multi-spectral photo-conversion devices using colloidal PbS nanocrystals

 

 

 

Date: 2017. 07. 06(Thu) 14:00 ~ 16:30

Place: Science Building, Room.202 Multimedia Room

Speaker: Prof. Do Young Kim(Oklahoma State Univ.)

Host of a Seminar: Prof. Junwoo Son

Abstract:

The ability to see, sense, harvest & convert energy over a wide band of the light spectrum, which includes visible, near-infrared (NIR) and shortwave infrared (SWIR), has tremendous value. Commercially-available solar cells and photodetectors do not have infrared sensitivity beyond 1 μm wavelength. While using in the NIR/SWIR wavelengths from 1.0 to 2.0 μm has been made practical by the development of InGaAs based devices, InGaAs based devices are expensive because the epitaxial process used to grow the materials. Furthermore, InGaAs devices have a very low sensitivity in the visible region and thus cannot be used across both the visible and SWIR spectral region. However, colloidal PbS nanocrystals (NCs) with excellent photosensitivity, bandgap tunability, and solution processability provide an attractive material system to realize such inexpensive multi-spectral photo-conversion devices with light sensitivity from UV/Visible to SWIR (350-2000 nm). In this talk, I will discuss recent progress in my research employing colloidal inorganic nanomaterials and organic semiconductors for IR applications. First, I will describe our unique PbS NCs synthesis method to provide unparalleled control of size and uniformity. This method enables synthesis of PbS NCs with excellent particle size control, resulting in well-defined absorption peaks at longer wavelengths up to 2 μm. With the highly mono-dispersed large PbS NCs, we recently demonstrated all-solution processed inorganic multi-spectral (UV-Visible-IR) PbS NCs photodetector with outstanding air-stability and the performance is comparable to epitaxial grown InGaAs photodetectors in terms of noise and detectivity. I will then describe our efforts to investigate a novel IR sensitive organic light emitting diode (OLED), functioning as an IR-to-visible up-conversion device, with a colloidal PbS NC IR sensitizer and an organic visible emitter as an alternative technology for IR imaging. We recently demonstrated a truly low cost IR imaging camera by incorporating the IR sensitive OLED in a commercially available digital single-lens reflex (DSLR) camera.

Dept. of MSE / BK21+

 

 





182개(1/10페이지)
세미나안내
번호 제목 글쓴이 조회 날짜
182 [2017 12 06] 정기세미나 11th 첨부파일 관리자 66 2017.12.04 09:16
181 [2017 11 29] 정기세미나 10th 첨부파일 관리자 131 2017.11.20 09:05
180 [2017 11 21] 특별세미나 _Prof. Sung Hoon Kang 첨부파일 관리자 279 2017.11.20 09:06
179 [2017 11 22] 정기세미나 9th 첨부파일 관리자 128 2017.11.20 09:05
178 [2017 11 15] 정기세미나 8th 첨부파일 관리자 146 2017.11.07 08:51
177 [2017 11 08] 정기세미나 7th 첨부파일 관리자 136 2017.11.07 08:51
176 [2017 11 01] 정기세미나 6th 첨부파일 관리자 170 2017.10.30 09:36
175 [2017 10 18] 정기세미나 5th 첨부파일 관리자 389 2017.09.25 09:23
174 [2017 10 11] 정기세미나 4th 첨부파일 관리자 317 2017.09.25 09:23
173 [2017 09 27] 정기세미나 3rd 첨부파일 관리자 263 2017.09.25 09:23
172 [2017 09 20] 정기세미나 2nd 첨부파일 관리자 272 2017.09.18 09:17
171 [2017 09 13] 정기세미나 1st 첨부파일 관리자 258 2017.09.11 09:43
170 [2017 09 06] 신소재공학과 특별세미나 첨부파일 관리자 268 2017.09.06 09:15
169 [2017 08 30] 특별세미나 _Ph.D Byeongdu Lee (A 첨부파일 관리자 1107 2017.08.21 11:49
168 [2017 08 23] 특별세미나 _Prof. Hong Li (Insti 첨부파일 관리자 447 2017.08.21 11:49
167 [2017 08 11] 특별세미나 _Prof. Ki Soo Park (K 첨부파일 관리자 277 2017.08.07 11:40
166 [2017 07 24] 특별세미나 _Prof. YJ Kwon (Unive 첨부파일 관리자 1221 2017.07.18 09:27
165 [2017 07 07] 특별세미나 _Prof. Dong Hee Son(D 첨부파일 관리자 1037 2017.07.06 13:26
>> [2017 07 06] 특별세미나 _Prof. Do Young Kim(O 첨부파일 관리자 506 2017.07.03 10:23
163 [2017 06 13] 특별세미나 강민철 (3D 프린팅 연구조합 상임이사 첨부파일 관리자 2323 2017.06.07 09:25