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Characterization of the Laser Scribing Process of HIT Cells for a Photovoltaic Shingled Module
Jee Hongsub,Lee Jaehyeong,Moon Daehan,Park Min-Joon,Jeong Taewung,Jeong Hyoungjin,Jeong Chaehwan 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.11
Shingled string technology can be used to maximize the output power of photovoltaic modules. The maximum power (Pmax) of a shingled photovoltaic module can be increased by using a bifacial heterojunction with an intrinsic thin layer (HIT) of cells. To fabricate the shingled strings for a high power module, we first cut 6-inch solar cells by laser scribing while minimizing cutting loss. Unlike standard crystalline silicon (c-Si) solar cells, the structure of bifacial HIT solar cells is weak under thermal effect, so an optimal scribing condition had to be found. After laser scribing processes had been optimized, Pmax was increased by 0.02W for each separated solar cells when we using an ultraviolet (UV) laser compared to the green laser, and a UV cut shingled string of HIT cell was demonstrated for the first time.
Analysis of floating photovoltaic system with shingled modules: monitoring and economic analysis
Jee Hongsub,Kim Juhwi,Lee Jaehyeong,Kim Minwoo 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.5
The foating PV power system using with shingled modules to maximize power generation efciency and its performance was analyzed through August 2020 to December 2020. The proposed system using the shingled module and its generated energy output was 20–30% more than the conventional PV system. Considering LCOE, it could be expected 22.223% reduction of LCOE and this power generation system which combines foating photovoltaic system and shingled modules is expected to have excellent economic feasibility as well as carbon reduction efects.
무회전축 회전식 수상태양광 시스템 및 실증 데이터 분석
지홍섭(Hongsub Jee),김민우(Minwoo Kim),배재성(Jaesung Bae),정정호(Jeongho Jeong),이재형(Jaehyeong Lee) 한국태양광발전학회 2021 Current Photovoltaic Research Vol.9 No.4
In this study, the pivotless tracking type floating photovoltaic system was demonstrated successfully. The photovoltaic modules were installed on buoyant objects and the dynamic stability reinforcement mooring gear, tension control equipment and buoyant stabilizer were used to provide enough buoyance and stability and response to the external environment. After installation of the pivotless tracking type floating photovoltaic system, generated solar energy was collected and analyzed.
전도성 접착제 물성에 따른 슁글드 어레이 태양전지 특성 평가
지홍섭(Hongsub Jee),최원용(Wongyong Choi),이재형(Jaehyeong Lee),정채환(Chaehwan Jeong) 한국태양광발전학회 2017 Current Photovoltaic Research Vol.5 No.3
The interconnecting shingled solar cells method shows extremely high ratio active area per total area and has the excellent potential for high power PV (photovoltaic). Compared to the conventional module, it can have much more active area due to busbar-free structure. The properties of ECA (electrically conductive adhesives) are significant to fabricate the shingled array PV since it should be used in terms of electric and structural connection. Various ECA were tried and characterized to optimize the soldiering conditions. The open circuit voltage of shingled array cells showed a three-fold increase and efficiency was also increased by 1.63%. The shingled array cells used in CE3103WLV showed the highest power and in CA3556HF the lowest curing temperature and very fast curing time.
Characterization of the copper iodide hole-selective contact for silicon solar cell application
Jeon, Kiseok,Jee, Hongsub,Park, Min Joon,Lim, Sangwoo,Jeong, Chaehwan Elsevier 2018 THIN SOLID FILMS - Vol.660 No.-
<P><B>Abstract</B></P> <P>Hole-selective contacts have been extensively studied in recent years due to their low-cost by low temperature processing (<250 °C). The γ-copper (I) iodide (CuI) behaves as a p-type semiconductor with a zinc blende structure (cubic) and it has previously been studied as a hole-selective layer in organic solar cells, solid-state dye-sensitized solar cells. In this paper, CuI thin films with wide band gaps and large work functions were fabricated on n-type silicon substrates via a thermal evaporation technique. Changes to the structural, morphological and optical properties of CuI thin films based on different thicknesses (11 to 58 nm) were analyzed. X-ray diffraction patterns reveal that poly crystalline CuI thin films a have γ-phase with preferential growth in the (111) direction. Increases in the peak intensity for the (111) diffraction plane were observed in the thicker films. Generally, deposited CuI films exhibit triangular shapes with azimuthal orientation but these shapes disappeared as the film thickness was increased. Excellent electrical and optical properties were obtained at a CuI film thickness of 11 nm; measured values were 642 mV implied voltage, ~3.00 eV band gap energy, 5.68 eV work function value and 97.5% transmittance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Copper iodide film is proposed as hole selective contact for solar cell application. </LI> <LI> γ-Phase copper iodide films are thermally evaporated. </LI> <LI> The work function value of copper iodide films is ~5.6 eV on average. </LI> <LI> The implied V<SUB>oc</SUB> decreases as copper iodide film thickness increases. </LI> </UL> </P>
고출력 슁글드 태양광 모듈의 라미네이션 공정조건 최적화
정정호 ( Jeongho Jeong ),지홍섭 ( Hongsub Jee ),김정훈 ( Junghoon Kim ),최원용 ( Wonyong Choi ),정채환 ( Chaehwan Jeong ),이재형 ( Jaehyeong Lee ) 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.3
Global warming is accelerating due to the use of fossil fuels that have been used continuously for centuries. Now, humankind recognizes its seriousness, and is conducting research on searching for eco-friendly and sustainable energy. In the field of solar energy, which is a kind of eco-friendly and sustainable, many studies are being conducted to enhance the output performance of the module. In this study, the output improvement for the shingled module structure was studied. In order to improve the output performance of the module, the thickness of the encapsulant was increased, and the lamination process conditions have been improved accordingly. After that, the crosslinking rate was analyzed, and the suitability of the lamination process conditions was judged using this. In addition, a peeling test was conducted to analyze the correlation between the adhesion of the encapsulant and the output performance of the module. Finally, the optimization for the encapsulant material and the lamination process conditions for high-power shingled modules was established, and accordingly, the market share of high-power shingled modules in the solar module market can be expected to rise.