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Transparent Electrode Techniques for Semitransparent and Tandem Perovskite Solar Cells
Helen Hejin Park 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.1
Inorganic–organic halide perovskite solar cells have attracted significant attention to the photovoltaic community consideringtheir high-efficiency, tunable bandgap, low-cost, and easy fabrication. Perovskite solar cells are especially an attractivetop cell partner for tandem applications with silicon bottom cells and other solar cell types with lower bandgap absorbers. For such tandem applications, semitransparent perovskite solar cell techniques with high near-infrared transparency becomeimportant, since the incident light needs to efficiently reach the bottom cell. This review article will summarize the statusand progress of perovskite-based tandem solar cells development, while focusing on the transparent electrode approachesand techniques. Future directions and challenges of transparent electrodes for semitransparent and tandem perovskite-basedphotovoltaics will also be discussed.
Nahm, Changwoo,Choi, Hongsik,Kim, Jongmin,Byun, Sujin,Kang, Suji,Hwang, Taehyun,Hejin Park, Helen,Ko, Jaejung,Park, Byungwoo IOP Pub 2013 Nanotechnology Vol.24 No.36
<P>A facile and straightforward method is suggested to synthesize nanoporous-TiO<SUB>2</SUB> thin films for dye-sensitized solar cells (DSSCs). Silver/TiO<SUB>2</SUB> co-sputtering led to the formation of nanocomposite films which consisted of silver nanoclusters with surrounding TiO<SUB>2</SUB> matrices, and metal particles were subsequently etched by just immersing in nitric acid. Nanoporous-TiO<SUB>2</SUB> DSSCs fabricated by this simple and effective process showed power-conversion efficiencies of up to 3.4% at a thickness of only 1.8 μm, which is much superior to that of conventional nanoparticulate-TiO<SUB>2</SUB> DSSCs with similar thickness.</P>
Kim, Mac,Kang, Tae-Woon,Kim, Sung Hyun,Jung, Eui Hyuk,Park, Helen Hejin,Seo, Jangwon,Lee, Sang-Jin Elsevier 2019 Solar energy materials and solar cells Vol.191 No.-
<P><B>Abstract</B></P> <P>Optical films with antireflective and self-cleaning surfaces have much potential for applications in solar cells, architectural glasses, and outdoor displays. Here we demonstrate the fabrication of novel self-cleaning antireflection (AR) thin films by depositing plasma-polymerized fluorocarbon (PPFC) which is fluorinated polymer consisting carbon and fluorine formed under plasma environment on Nb<SUB>2</SUB>O<SUB>5</SUB>/SiO<SUB>2</SUB>/Nb<SUB>2</SUB>O<SUB>5</SUB> (NSN) trilayers using mid-range frequency power source in a continuous roll-to-roll sputtering system. The reflectance of PPFC/NSN films with a PPFC thickness of 70 nm was 1.71% at a wavelength of 528 nm, and the PPFC/NSN films showed low reflectance in a wide range in the visible region. The PPFC/NSN AR films exhibited a water-repelling surface with water contact angle of 105° after the application of a top fluorocarbon layer with low surface energy. We tested and confirmed the AR and self-cleaning functions of the PPFC/NSN films through the incorporation to perovskite solar cells (PSC). The short-circuit current density and power conversion efficiency of PPFC/NSN/HC-PET/PSC were 20.6 mA cm<SUP>−2</SUP> and 17%. By attaching a self-cleaning AR films to both side of PSC, photocurrent collection of the device was improved and applicability of protective films to PSC was demonstrated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A self-cleaning antireflection quadrilayered thin film was fabricated by R2R sputtering. </LI> <LI> Plasma-polymerized fluorocarbon with low surface energy was applied as the top layer. </LI> <LI> The reflectance of antireflection film was reduced to 1.71% in the visible region. </LI> <LI> The antireflection film showed water-repellent surface above 100° of water contact angle. </LI> <LI> By attaching antireflection film to the PSCs, the photocurrent collection was improved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Effective wrapping of graphene on individual Li4Ti5O12grains for high-rate Li-ion batteries
Oh, Yuhong,Nam, Seunghoon,Wi, Sungun,Kang, Joonhyeon,Hwang, Taehyun,Lee, Sangheon,Park, Helen Hejin,Cabana, Jordi,Kim, Chunjoong,Park, Byungwoo The Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.7
초음파전파영상화 시스템을 이용한 필라멘트 와인딩 복합재 수소 연료 탱크의 손상 가시화
이정률 ( Jung Ryul Lee ),정효미 ( Hy Omi Jeong ),트루옹탄충 ( Truong Thanh Chung ),신혜진 ( Hejin Shin ),박재윤 ( Jaeyoon Park ) 한국복합재료학회 2015 Composites research Vol.28 No.4
알루미늄 혹은 플라스틱 라이너에 탄소섬유를 감아서 성형하는 복합재 압력용기가 수소 자동차의 수소연료 탱크로 사용이 확대됨에 따라 사용 시 안전에 대한 규정 제정이 필요하며 그 규정을 뒷바침 할 수 있는 검사 장비와 기술 역시 개발되어야 한다. 자동차에 장착하기 전에 제작결함 평가를 통해 수소 자동차에 장착되어야 하고, 취급 중 발생하는 이벤트에 대해서도 고속 자동화 검사를 통해 자동차 정비소의 정비인력, 즉 비파괴평가 전문가가 별도의 교육을 받지 않았어도 즉시 충격과 같은 손상을 평가할 수 있어야 한다. 위 요소는 수소자동차의 대중화를 위해 매우 중요한 기술적 허들이다. 본 연구에서는 수소연료탱크의 충격손상을 검사하는 방법으로 레이저 초음파 기술을 제안하며 충격손상을 탈·부착형 센서헤드를 가진 초음파전파영상화 시스템으로 가시화할 수 있음을 증명한다. 또한 제안한 초음파전파영상화 시스템의 성능은 수소자동차가 대중화되더라도 현장기술로 채택 될 수 있음을 뒷받침한다. This paper proposes laser ultrasonic technique for the impact damage inspection of hydrogen fuel tank and proves that the impact damage can be visualized using an ultrasonic wave propagation imager with an easy detachable sensor head as an impact damage inspection tool for hydrogen fuel tanks. Also the performances of the proposed ultrasonic propagation imager support it can be implemented in real-world technology when the hydrogen car becomes popular.
He, Jin,Kim, Jae Ri,Lee, Seung Yeoun,Oh, Jinseok,Park, Taesung,Kang, Mee Joo,Kwon, Wooil,Kim, Hongbeom,Kim, Sun-Whe,Cameron, John L.,Wolfgang, Christopher L.,Jang, Jin-Young Wiley (John WileySons) 2017 Journal of hepato-biliary-pancreatic sciences Vol.24 No.8
<P>Conclusion This new staging system has better discriminatory ability in stratifying 5-year OS rates based on a large multinational database.</P>