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Bifunctional Etalon-Electrode To Realize High-Performance Color Filter Free Image Sensor
Yoon, Seongwon,Sim, Kyu Min,Chung, Dae Sung American Chemical Society 2019 ACS NANO Vol.13 No.2
<P>Organic photodiodes (OPDs), based on organic semiconductors with high absorption coefficients for visible light, are emerging as potential candidates for replacing silicon photodiodes in image sensors, particularly due to the possibility of realizing a thin thickness and exclusion of color filters, both of which can contribute to a dramatically enhanced degree of integration for image sensors. Despite years of research, techniques have not yet been developed that allow the OPD itself to have color selectivity while maintaining a thin (<1 μm) OPD thickness, in combination with a sufficiently high detectivity (>10<SUP>12</SUP> cm·Hz<SUP>0.5</SUP>/W). To solve this issue, we introduce a concept of “etalon-electrode”, which can perform the function of electrode and simultaneously the function of selective wavelength transparency. A strategically designed OPD architecture consisting of an etalon-electrode, a panchromatic organic active layer, and a counter electrode displays well-defined narrowband R-/G-/B-selective detectivity spectra depending on precision-adjusted thickness composition of the etalon-electrode. While a thin thickness of OPD is preserved at less than 800 nm including electrodes, active layer, and other buffer layers for all R-/G-/B-selective OPDs, high average detectivity values over 10<SUP>12</SUP> cm·Hz<SUP>0.5</SUP>/W are demonstrated. Furthermore, the characteristic of imparting color selectivity by the etalon-electrode enables a more facile full color patterning, such that a prototype of a 10 × 10 image sensor with a pixel pitch of 500 μm is realized, resulting in accurate picturing of a well-defined full color image.</P> [FIG OMISSION]</BR>
Yoon, Seongwon,Ha, Jaeun,Sim, Kyu Min,Cho, Wookhyun,Chung, Dae Sung Elsevier 2016 ORGANIC ELECTRONICS Vol.35 No.-
<P><B>Abstract</B></P> <P>Synthetic approaches for optimizing polymer-based organic photodiodes (OPDs) by systematically analyzing the effects of the hole-blocking layer, the electron-blocking layer, and the thickness and morphology of the active layer with respect to the dark current and detectivity have been reported. PBDTT-DPP with a repeating alkylthienylbenzodithiophene (BDTT) and diketopyrrolopyrrole (DPP) units is used as a p-type polymer for achieving both broadband absorption and a high absorption coefficient in conjunction with n-type [6,6]-phenyl C<SUB>70</SUB> butyric acid methyl ester (PC<SUB>70</SUB>BM) for constructing photoactive layers. Through systematic investigations of various interfacial layers, we found that the thickness of the active layer and the energy level of the hole/electron blocking layer were critical for minimizing the dark current of OPDs. By changing the deposition method of the PBDTT-DPP/PC<SUB>70</SUB>BM blend and using post treatment, we discovered that the morphology of the active layer was directly related to the photocurrent of OPDs. Furthermore, we conducted a comparative study between a bulk heterojunction and a planar heterojunction (PHJ) to demonstrate the effectiveness of the PHJ for suppressing the dark current. Consequently, we realized a high detectivity of 5.3 × 10<SUP>12</SUP> Jones with an optimized device architecture and morphology. This work shows the importance of a synthetic approach for optimizing OPDs that requires both a high photocurrent and a low dark current in the reverse saturation regime.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We systematically optimized the polymeric photodiodes in terms of interlayers, thickness and morphology of the active layer. </LI> <LI> The optimal blocking layers, thickness and morphology conditions enabled a high detectivity of 5.3 × 10<SUP>12</SUP> Jones at −1 V. </LI> <LI> Based on a planar heterojunction structure, dark current could be further suppressed by limiting the charge injection. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
IMU-integrated Optical Navigation System for Tracking Multi-agent
Seongwon Yoon,Junwoo Jason Son,Soohee Han 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
In this paper, an IMU-integrated optical navigation system is presented. In the existing motion capture system, it was necessary to use the geometry of the recognized multiple markers to obtain the attitude of the object. On the other hand, in the proposed system, with only a small number of cameras, real-time output of 6-DOF including position and attitude was enabled by compactly implementing a single infrared marker with embedded IMU and computing board as an agent module. As a result of the development, it was possible to dramatically improve the problem of the existing rigid body-based attitude estimation method in which the attitude estimation error changes according to the distance from the cameras. In addition, according to the wireless time synchronization implementation of the camera and the agent, unique identification and tracking for each of the multiple agents operating in the same system was enabled. Therefore, this system is expected to have a very high potential for use in factory automation (FA) and robotics. In this paper, the principle of this system and each system component are explained.
Towards New African Security: A Prospective Role of the African Continental Free Trade Area (AfCFTA)
( Seongwon Yoon ),( Sungsoo Kim ) 한국국방연구원 2021 The Korean Journal of Defense Analysis Vol.33 No.2
The African Continental Free Trade Area (AfCFTA) is a flagship project of the African Union under Agenda 2063. Although the AfCFTA appears to be an economic issue on the surface, it is in essence a security agenda. Through the lens of the securitization framework, this article explores why the AfCFTA needs to be explained in a wider context of the nexus between security and the economy. After illustrating the traits of the security-economy nexus of Africa, the analysis incorporates security discourses in relation to the Regional Economic Communities (RECs) and the African Peace and Security Architecture (APSA), both of which demonstrate the continent-wide importance of the linkage between security and the economy. Despite RECs and APSA being core components of the structuring of African security, however, this article notes that they have fallen short of changing the basic structure of a security discourse that has been state-driven. Against this background, in highlighting the potential of the AfCFTA as a new strategic approach that enhances the discursive space for civil societies, a case is made for labeling non-elite social strata as security actors.
국제정치, 알제리, 그리고 〈파피차〉: 영화와 표상을 통한 사회안보 재구성
윤성원(Seongwon Yoon) 고려대학교 평화와민주주의연구소 2021 평화연구 Vol.29 No.1
본고는 국제정치에서 표상의 가치를 회복하고자 하는 과정의 일환이다. 표상을 시민사회의 정체성을 나타내는 사회안보 관점에서 다룬다. 본고는 또한 국제정치에서 심미적 전환의 일부다. 실증주의적 모사(模寫)보다는 표상을 통해 현상을 해석한다. 표상을 창출하는 예술적 도구로는 영화를, 표상의 실체를 담당할 사례로는 알제리를 선택했다. 알제리는 아랍의 봄이 남긴 시대정신이 비교적 온전히 잔존하고 있는 곳으로 현대 사회운동의 지속적 표상이다. 나아가 필견영화의 모티브가 된 곳으로 심미적 전환을 다루기에 적절한 장소다. 본고는 영화 <파피차>를 통해 대규모 비폭력 저항운동인 히락(Hirak)의 표상이 도출된 과정을 관련 대상들을 활용한 상징체계로 접근한다. 이를 기반으로 국제정치-영화의 이항적 적용을 넘어 영화가 국제정치 현상 분석에 실제적으로 이바지할 수 있음을 제시한다. This article explores the possibilities of restoring the value of representation in international relations (IR). In the process, it focuses upon societal security wherein the collective identity of civil society will eventually be valued. This article is also part of the aesthetic turn in IR, which uses representation and symbolic systems in an attempt to interpret the international political phenomena, thereby putting some distance between itself and positivist mimetic approaches. Here, films are employed as the artistic apparatus that creates representation. Algeria, for several reasons, has been selected as an example to substantiate the role of representation. First, Algeria is witnessing a continuation of the zeitgeist of the Arab Spring that represents social movements in the twenty-first century. Second, Algeria is the right place to deal with the aesthetic turn, in that it has long functioned as an alternative to Western-centered post-positivism. Lastly, Algeria has become the motif of must-see films in terms of the symbolic systems in IR. This article considers the process by which the representation of Hirak, a large-scale nonviolent resistance movement in Algeria, was derived through the objects employed in the film “Papicha”.