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광-전기 복합 시냅스 구현이 가능한 산화물 기반의 다진법 소자의 특성
임정욱(Jung Wook Lim),김지은(Jieun Kim) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
We fabricated 3-terminal synaptic transistors based on TiO₂ semiconductors, where charge inducing layers and FN tunneling layers are employed to simultaneously express the synaptic and multi-valued logic (MVL) devices. The devices show superb linearity in a learning process for electric and optical stimulus. Also, the devices show MVL characteristics and good reproducibility for repeated 100 cycles.
이규성,임정욱,강만구,김경현,류호준,Lee, Kyu-Sung,Lim, Jung Wook,Kang, Mangu,Kim, Kyung Hyun,Ryu, Hojun 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.5
Smart window technology has become a major component of smart buildings, leading to energy savings and enhanced functionality. Smart windows work like curtains or blind screens, blocking external light sources. Smart window components employ electrochromic or photochromic materials that can selectively block sunlight when electricity is applied. The installation of low-E glass and building-integrated photovoltaics (BIPV) is being encouraged in accordance with the policy on saving building energy. To incorporate BIPV into smart windows, the transparency and colors of transparent photovoltaics must be optimized. The power sources required to operate these smart windows take advantage of the transparent color of the solar cells, which also facilitates aesthetics. Self-powered smart windows that combine electrochromic or photochromic screens with transparent solar cells suggest a promising convergent technology.
스퍼터 증착으로 형성된 AlTiO 선택적 투과막의 표면 균질성에 따른 광학적 특성
정소운,임정욱,이승윤,Jeong, So-Un,Lim, Jung-Wook,Lee, Seung-Yun 한국진공학회 2012 Applied Science and Convergence Technology Vol.21 No.1
건물일체형 태양전지는 투명 연료감응형 태양전지 기술을 중심으로 연구개발이 진행되고 있다. 신뢰성-수율 개선 및 대면적화의 필요성 때문에 잘 정립된 박막 공정 기술에 기초하는 Si계 박막 태양전지가 건물일체형 태양전지를 구현할 기술로서 새롭게 조명 받고 있다. Si계 박막 태양전지에 선택적 투과막을 적용하면 가시광선은 태양전지를 투과하고 적외선은 광흡수층으로 반사되기 때문에 투명 태양전지의 변환효율이 향상된다. 본 연구에서는 선택적 투과막의 증착 기술로서 생산성 측면에서 유리한 스퍼터 증착을 이용하여 AlTiO 선택적 투과막을 형성하고 증착 조건을 조절하여 투과율을 향상시켰다. Transparent dye-sensitized solar cells have been widely investigated for the application to building integrated photovoltaic system. Thin film Si-based solar cells are emerging as a substitute for the dye-sensitized solar cells because their merits of well-established manufacturing processes. Since the selective transmitting layer transmits visible light and reflects infrared light, the solar cell efficiency increases with the introduction of the selective transmitting layer. In this work, AlTiO thin films were grown as the selective transmitting layer by cost-effective sputter deposition and their transmittances were improved by controlling deposition parameters.
Al-Ti계 산화물 박막의 조성에 따른 선택적 투과 특성
방기수,정소운,임정욱,이승윤,Bang, Ki Su,Jeong, So Un,Lim, Jung Wook,Lee, Seung-Yun 한국진공학회 2013 Applied Science and Convergence Technology Vol.22 No.1
It is expected that progress in building-integrated photovoltaic (BIPV) systems, improving the functionality and design of buildings, will be accelerated in the coming years. While the dye sensitized solar cell is considered one of the most important technologies in the BIPV field, the transparent silicon based thin film solar cell fabricated by thin film processes has drawn attention as a novel alternative. When the selective transmitting layer is applied to the solar cell, the conversion efficiency is improved due to the re-reflection of infrared light into an absorber layer with the transmission of visible light through the solar cell. In this work, we prepared Al-Ti based oxide thin films using cost-effective sputter deposition and examined their selective transmitting characteristics with various compositions. The transmittance and reflectance of the Al-Ti based oxide thin film changed with the variation of its composition, and the selective transmitting property was observed in the sample with the 25 nm-thick AlTiO layer. It is considered that the realization of transparent solar cells and the improvement of their conversion efficiency can be achieved by introducing the Al-Ti based selective transmitting layer. 건물기능과 디자인을 개선하는 건물일체형 태양전지의 발전 가능성이 높게 평가되고 있다. 현재는 투명 염료감응형 태양전지가 유력한 건물일체형 태양전지 기술로서 개발되고 있는데 박막 공정 기술에 기초하는 Si계 투명 박막 태양전지가 새로운 대안으로서 조명받고 있다. Si계 투명 박막 태양전지에 선택적 투과막을 적용하면 가시광선은 태양전지를 투과하고 적외선은 광 흡수층으로 재반사되기 때문에 변환효율이 향상된다. 본 연구에서는 여러 종류의 박막 증착 기술 중에서 경제성이 높은 스퍼터링 방식을 이용하여 Al-Ti계 산화물 박막을 형성하고 조성에 따른 선택적 투과 특성 변화를 관찰하였다. Al-Ti계 산화물 박막의 투과율 및 반사율은 조성에 따라 크게 변화하였으며 25 nm 두께의 AlTiO 박막에서 선택적 투과 특성이 관찰되었다. 이러한 Al-Ti계 산화물 박막의 광학적 특성을 Si계 박막 태양전지에 응용하면 투명 태양전지 구현 및 변환효율 향상이 가능해 지리라 판단된다.
실리콘 기판 표면 형상에 따른 반사특성 및 광 전류 개선 효과
연창봉,이유정,임정욱,윤선진,Yeon, Chang Bong,Lee, Yoo Jeong,Lim, Jung Wook,Yun, Sun Jin 한국재료학회 2013 한국재료학회지 Vol.23 No.2
For fabricating silicon solar cells with high conversion efficiency, texturing is one of the most effective techniques to increase short circuit current by enhancing light trapping. In this study, four different types of textures, large V-groove, large U-groove, small V-groove, and small U-groove, were prepared by a wet etching process. Silicon substrates with V-grooves were fabricated by an anisotropic etching process using a KOH solution mixed with isopropyl alcohol (IPA), and the size of the V-grooves was controlled by varying the concentration of IPA. The isotropic etching process following anisotropic etching resulted in U-grooves and the isotropic etching time was determined to obtain U-grooves with an opening angle of approximately $60^{\circ}$. The results indicated that U-grooves had a larger diffuse reflectance than V-grooves and the reflectances of small grooves was slightly higher than those of large grooves depending on the size of the grooves. Then amorphous Si:H thin film solar cells were fabricated on textured substrates to investigate the light trapping effect of textures with different shapes and sizes. Among the textures fabricated in this work, the solar cells on the substrate with small U-grooves had the largest short circuit current, 19.20 mA/$cm^2$. External quantum efficiency data also demonstrated that the small, U-shape textures are more effective for light trapping than large, V-shape textures.
이재희(Jaehee Lee),임정욱(Jung Wook Lim) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
In this paper, we proposed photosynaptic transistor with a dual gate dielectric. We enhanced its performance using high-K materials and mimic biological synapses by supplying holes to the channel and trapping them at the channel/CID interface using a charge inducing dielectric. Therefore, we manufactured photo-synaptic transistors in this paper to characterize their properties and mimic human short-term and longterm memory by using UV light.