• Se Incorporation in VTD-SnS by RTA and Its Influence on Performance of Thin Film Solar Cells
    Rahul Kumar Yadav, Yong Tae Kim, Pravin S. Pawar, Jaeyeong Heo
    Planner configuration thin film solar cells (TFSCs) with SnS/CdS heterojunction performed a lower short-circuit current (JSC). In this study, … + READ MORE
    Planner configuration thin film solar cells (TFSCs) with SnS/CdS heterojunction performed a lower short-circuit current (JSC). In this study, we have demonstrated a path to overcome deficiency in JSC by the incorporation of Se in the SnS absorber. We carried out the incorporation of Se in VTD grown SnS absorber by rapid thermal annealing (RTA). The diffusion of Se is mostly governed by RTA temperature (TRTA), also it is observed that film structure changes from cube-like to plate-like structure with TRTA. The maximum JSC of 23.1 mA cm-2 was observed for 400°C with an open-circuit voltage (VOC) of 0.140 V for the same temperature. The highest performance of 2.21% with JSC of 18.6 mA cm-2, VOC of 0.290 V, and fill factor (FF) of 40.9% is observed for a TRTA of 300°C. In the end, we compare the device performance of Se- incorporated SnS absorber with pristine SnS absorber material, increment in JSC is approximately 80% while a loss in VOC of about 20% has been observed. - COLLAPSE
    30 June 2022
  • Effect of Pre-annealing on the Formation of Cu2ZnSn(S, Se)4 Thin Films from a Se-containing Cu/SnSe2/ZnSe2 Precursor
    Young Min Ko, Sung Tae Kim, Jae Hyuck Ko, Byung Tae Ahn, R. B. V. Chalapathy
    A Se-containing Cu/SnSe2/ZnSe precursor was employed to introduce S to the precursor to form Cu2ZnSn(S,Se)4 (CZTSSe) film. … + READ MORE
    A Se-containing Cu/SnSe2/ZnSe precursor was employed to introduce S to the precursor to form Cu2ZnSn(S,Se)4 (CZTSSe) film. The morphology of CZTSSe films strongly varied with two different pre-annealing environments: S and N2. The CZTSSe film with S pre-annealing showed a dense morphology with a smooth surface, while that with N2 pre-annealing showed a porous film with a plate-shaped grains on the surface. CuS and Cu2Sn(S,Se)3 phases formed during the S pre-annealing stage, while SnSe and Cu2SnSe3 phases formed during the N2 pre-annealing stage. The SnSe phase formed during N2 pre-annealing generated SnS2 phase that had plate shape and severely aggravated the morphology of CZTSSe film. The power conversion efficiency of the CZTSSe solar cell with S pre-annealing was low (1.9%) due to existence of Zn(S.Se) layer between CZTSSe and Mo substrate. The results indicated that S pre-annealing of the precursor was a promising method to achieve a good morphology for large area application. - COLLAPSE
    30 June 2022
  • A Brief Review on Strategies for Improving UV and Humidity Stability of Perovskite Solar Cells Towards Commercialization

    페로브스카이트 태양전지 상용화를 위한 자외선 및 수분 안정성 향상 전략

    Eunhye Hwang, Tae-Hyuk Kwon

    황은혜, 권태혁

    With rapid growth in light-harvesting efficiency from 3.8 to 25.8%, organic-inorganic hybrid perovskite solar cells (PSCs) have attracted great attention as promising … + READ MORE
    With rapid growth in light-harvesting efficiency from 3.8 to 25.8%, organic-inorganic hybrid perovskite solar cells (PSCs) have attracted great attention as promising photovoltaic devices. However, despite of their outstanding performance, the commercialization of PSCs has been suffered from severe stability issues, especially for UV and humidity: (i) UV irradiation towards PSCs is able to lead UV-induced decomposition of perovskite films or catalytic reactions of charge-transporting layers, and (ii) exposure to surrounding humidity causes irreversible hydration of perovskite layers by the penetration of water molecules, resulting considerable decrease in their power-conversion efficiency (PCE). This review investigates current status of strategies to enhance UV and humidity stability of PSCs in terms of UV-management and moisture protection, respectively. Furthermore, the multifunctional approach to increase long-term stability as well as performance is discussed as advanced research directions for the commercialization of PSCs. - COLLAPSE
    30 June 2022
  • Structural Analysis Model to Evaluate the Mechanical Reliability of Large-area Photovoltaic Modules

    대면적 태양광 모듈의 기계적 신뢰성 평가를 위한 모델

    Yo Han Noh, Jeong Ho Jeong, Jaehyeong Lee

    노요한, 정정호, 이재형

    Recently, the expansion of the domestic solar market due to the promotion of eco-friendly and alternative energy-related policies is promising, and it … + READ MORE
    Recently, the expansion of the domestic solar market due to the promotion of eco-friendly and alternative energy-related policies is promising, and it is expected to lead the high-efficiency/high-power module market based on M10 or larger cells to reduce LCOE, 540-560W, M12 based on M10 cells Compared to the existing technology with an output of 650-700W based on cells, it is necessary to secure competitiveness through the development of modules with 600W based on M10 cells and 750W based on M12 cells. For the development of high efficiency/high-power n-type bifacial, it is necessary to secure a lightweight technology and structure due to the increase in weight of the glass to glass module according to the large area of ​​the module. Since the mechanical strength characteristics according to the large area and high weight of the module are very important, design values ​​such as a frame of a new structure that can withstand the mechanical load of the Mechanical Load Test and the location of the mounting hole are required. In this study, a structural analysis design model was introduced to secure mechanical reliability according to the enlargement of the module area, and the design model was verified through the mechanical load test of the actual product. It can be used as a design model to secure the mechanical reliability required for PV modules by variables such as module area, frame shape, and the location and quantity of mounting holes of the structural analysis model verified. A relationship of output drop can be obtained. - COLLAPSE
    30 June 2022
  • Comparative Economic Analysis of RE100 Implementation Methods in South Korea

    국내 RE100 이행방안의 경제성 비교분석 연구

    Sang Hyo An, JongRoul Woo

    안상효, 우종률

    The Global RE100 campaign is a one of the voluntary campaign, but it has a lot of influence on domestic companies that … + READ MORE
    The Global RE100 campaign is a one of the voluntary campaign, but it has a lot of influence on domestic companies that have not yet joined the Global RE100. Accordingly, the Korean government introduced the Korean RE100 (K-RE100) system to prepare an institutional mechanism for domestic companies to respond to RE100. However, in Korea, due to the high LCOE of renewable energy and institutional limitations of the power transaction system, there is a limit for companies to implement RE100 in various ways. Therefore, in this study, the implementation cost of RE100 for green tariff, REC purchase, third-party PPA, direct(or corporate) PPA, and self-generation was compared and analyzed to derive the order of implementation with the net present value (NPV) of costs incurred over 20 years. As a result, self-construction was analyzed as the most economical method, but the implementation through the green tariff seemed to be the most realistic implementation method so far. However, considering the gradually falling LCOE, third-party PPA and direct PPA could be secured competitiveness against green tariff in 2025 and 2026. Then it could allow the companies to have various portfolios for implementation of RE100. - COLLAPSE
    30 June 2022