• Recent Development of High-efficiency Silicon Heterojunction Technology Solar Cells

    실리콘 이종접합 태양전지 개발동향

    Lee, Ahreum, Yoo, Jinsu, Park, Sungeun, Park, Joo Hyung, Ahn, Seungkyu and Cho, Jun-Sik

    이아름, 유진수, 박성은, 박주형, 안승규, 조준식

    Silicon heterojunction technology (HJT) solar cells have received considerable attention due to advantages that include high efficiency over 26%, good performance in … + READ MORE
    Silicon heterojunction technology (HJT) solar cells have received considerable attention due to advantages that include high efficiency over 26%, good performance in the real world environment, and easy application to bifacial power generation using symmetric device structure. Furthermore, ultra-highly efficient perovskite/c-Si tandem devices using the HJT bottom cells have been reported. In this paper, we discuss the unique feature of the HJT solar cells, the fabrication processes and the current status of technology development. We also investigate practical challenges and key technologies of the HJT solar cell manufacturers for reducing fabrication cost and increasing productivity. - COLLAPSE
    31 December 2021
  • Electrode Design for Electrode Formation and PV Module Integration Development

    전극형성과 태양전지 모듈 일체화 기술 개발에 적용되는 태양전지 전극 설계 기술

    Park, Jinjoo, Jeon, Youngwoo, Jang, Minkyu, Kim, Minje and Lim, Donggun

    박진주, 전영우, 장민규, 김민제, 임동건

    This study was on electrode design for the realization of a solar cell that combines electrode formation and module integration process to … + READ MORE
    This study was on electrode design for the realization of a solar cell that combines electrode formation and module integration process to overcome printing limitations. We used the passivated emitter rear contact (PERC) solar cell. Wafer size was 156.75 mm ×156.75 mm. The fabricated cell results showed that the open-circuit voltage of 649 mV, short-circuit current density of 36.15 mA/cm2, fill factor of 68.5%, and efficiency of 16.06% with electrode conditions the 24BBs with the width 190 μm and 90FBs with the width 45 μm. For improving efficiency, the characteristics of the solar cell were checked according to the change in the number of BBs and FBs and the change in line fine width. It is confirmed that the efficiency of the solar cell will be improved by increasing the number of FBs from 90 to 120, and increasing the line width of the FBs by about 10 μm compared to the manufacturing solar cells. - COLLAPSE
    31 December 2021
  • Effect of poly-Si Thickness and Firing Temperature on Metal Induced Recombination and Contact Resistivity of TOPCon Solar Cells

    Poly-Si 두께와 인쇄전극 소성 온도가 TOPCon 태양전지의 금속 재결합과 접촉비저항에 미치는 영향

    Lee, Sang Hee, Yang, Hee Jun, Lee, Uk Chul, Lee, Joon Sung, Song, Hee-eun, Kang, Min Gu, Yoon, Jae Ho and Park, Sungeun

    이상희, 양희준, 이욱철, 이준성, 송희은, 강민구, 윤재호, 박성은

    Advances in screen printing technology have been led to development of high efficiency silicon solar cells. As a post PERx structure, an … + READ MORE
    Advances in screen printing technology have been led to development of high efficiency silicon solar cells. As a post PERx structure, an n-type wafer-based rear side TOPCon structure has been actively researched for further open-circuit voltage (Voc) improvement. In the case of the metal contact of the TOPCon structure, the poly-Si thickness is very important because the passivation of the substrate will be degraded when the metal paste penetrates until substrate. However, the thin poly-Si layer has advantages in terms of current density due to reduction of parasitic absorption. Therefore, poly-Si thickness and firing temperature must be considered to optimize the metal contact of the TOPCon structure. In this paper, we varied poly-Si thickness and firing peak temperature to evaluate metal induced recombination (Jom) and contact resistivity. Jom was evaluated by using PL imaging technique which does not require both side metal contact. As a results, we realized that the SiNx deposition conditions can affect the metal contact of the TOPCon structure. - COLLAPSE
    31 December 2021
  • The Pivotless Tracking Type Floating Photovoltaic System and the Collected Data Analysis

    무회전축 회전식 수상태양광 시스템 및 실증 데이터 분석

    Jee, Hongsub, Kim, Minwoo, Bae, Jaesung, Jeong, Jeongho and Lee, Jaehyeong

    지홍섭, 김민우, 배재성, 정정호, 이재형

    In this study, the pivotless tracking type floating photovoltaic system was demonstrated successfully. The photovoltaic modules were installed on buoyant objects and … + READ MORE
    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. - COLLAPSE
    31 December 2021
  • The Fabrication of the Cu(In, Ga)Se2 Absorber Layer Using Binary Precursor Films Deposited by Chemical Vapor Deposition

    화학기상증착된 이원계 화합물 프리커서를 이용한 Cu(In, Ga)Se2 흡수층의 제조

    Lee, Gyeong A, Kim, A Hyun, Cho, Sung Wook, Lee, Kang-Yong and Jeon, Chan-Wook

    이경아, 김아현, 조성욱, 이강용, 전찬욱

    In this study, the microstructure of the CVD-fabricated Cu(In,Ga)Se2 (CIGSe) absorber layer by simulating the stacking sequence used in a co-evaporation … + READ MORE
    In this study, the microstructure of the CVD-fabricated Cu(In,Ga)Se2 (CIGSe) absorber layer by simulating the stacking sequence used in a co-evaporation method, and changes solar cell performance were investigated. The absorber layer prepared by stacking CuSe and (In,Ga)Se between InSe is separated into Ga-free CuInSe2 and Ga-rich CIGSe, and transformed to CIGSe by selenization heat treatment with slight improvement in the the solar cell efficiency. However, in CVD, since the supply of liquid Cu-Se is not as active as in the co-evaporation method, the nanoocrystalline layer containing a large amount of Ga remained independently in the absorption layer, which acted as a cause of the loss of JSC and FF. Therefore, by using a precursor structure in which CuGa is sputter-deposited on a single layer of InSe deposited by CVD, performance parameters of VOC, JSC, and FF could be greatly improved. - COLLAPSE
    31 December 2021
  • Effective Interfacial Trap Passivation with Organic Dye Molecule to Enhance Efficiency and Light Soaking Stability in Polymer Solar Cells
    Rasool, Shafket, Zhou, Haoran, Vu, Doan Van, Haris, Muhammad, Song, Chang Eun, Kim, Hwan Kyu and Shin, Won Suk
    Light soaking (LS) stability in polymer solar cells (PSCs) has always been a challenge to achieve due to unstable photoactive layer-electrode interface. … + READ MORE
    Light soaking (LS) stability in polymer solar cells (PSCs) has always been a challenge to achieve due to unstable photoactive layer-electrode interface. Especially, the electron transport layer (ETL) and photoactive layer interface limits the LS stability of PSCs. Herein, we have modified the most commonly used and robust zinc oxide (ZnO) ETL-interface using an organic dye molecule and a co-adsorbent. Power conversion efficiencies have been slightly improved but when these PSCs were subjected to long term LS stability chamber, equipped with heat and humidity (45°C and 85% relative humidity), an outstanding stability in the case of ZnO/dye+co-adsorbent ETL containing devices have been achieved. The enhanced LS stability occurred due to the suppressed interfacial defects and robust contact between the ZnO and photoactive layer. Current density as well as fill factors have been retained after LS with the modified ETL as compared to un-modified ETL, owing to their higher charge collection efficiencies which originated from higher electron mobilities. Moreover, the existence of less traps (as observed from light intensity-open circuit voltage measurements and dark currents at -2V) are also found to be one of the reasons for enhanced LS stability in the current study. We conclude that the mitigation ETL-surface traps using an organic dye with a co-adsorbent is an effective and robust approach to enhance the LS stability in PSCs. - COLLAPSE
    31 December 2021