Browsing by Author "Sanglee K."

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    Intermediate matching layer for light-induced performance and removable clip-on applications of four-terminal perovskite/silicon heterojunction tandem solar cells
    (2023-05-01) Sanglee K.; Sakunkaewkasem S.; Piromjit C.; Nukunudompanich M.; Kanjanaboos P.; Chuangchote S.; Suttiruengwong S.; Sahasithiwat S.; Limmanee A.; Krajangsang T.; Mahidol University
    Perovskite/silicon tandem solar cells are one of the most efficient ways to improve the performance of the photovoltaic industry and should be viewed as a promising path in the photovoltaic field. The silicon photovoltaic modules have a lifespan of over 20 years, while the low device stability of perovskite solar cells (PSCs) remains a significant commercialization barrier. An air gap acts as an optical spacer layer for four terminal (4T) perovskite/silicon tandem cells, resulting in a loss of efficiency. Using polydimethylsiloxane (PDMS) as an intermediate matching layer (IML) and a clip-on design made of a PDMS-based material sandwiched between polyvinyl chloride (PVC) layers with the configuration of PVC/IML/PVC, this research not only achieved efficiency improvement of four-contact tandem solar cells but also greatly simplified disassembly of individual cells. The 4T perovskite/silicon heterojunction tandem cells with a clip-on design achieved the highest efficiency of 23.49% for the active area of 1 cm2, while the fully tandem configuration without a clip-on layer only exhibited a PCE of 22.83%. The clip-on technology has the potential to boost the current density of silicon heterojunction solar cells from 15.01 mA/cm2 (for the filtered bottom cell with an air gap) up to 16.51 mA/cm2 (for the filtered bottom cell with a clip-on). Therefore, this state-of-the-art allows for the removal of PSCs with a shorter lifespan while adhering two photovoltaic cells together securely and effectively.
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    Photoexcitation of perovskite precursor solution to induce high-valent iodoplumbate species for wide bandgap perovskite solar cells with enhanced photocurrent
    (2023-12-01) Naikaew A.; Krajangsang T.; Srathongsian L.; Seriwattanachai C.; Sakata P.; Burimart S.; Sanglee K.; Khotmungkhun K.; Ruankham P.; Romphosri S.; Limmanee A.; Kanjanaboos P.; Mahidol University
    Solution-processed organic–inorganic hybrid perovskite solar cells are among the candidates to replace the traditional silicon solar cells due to their excellent power conversion efficiency (PCE). Despite this considerable progress, understanding the properties of the perovskite precursor solution is critical for perovskite solar cells (PSCs) to achieve high performance and reproducibility. However, the exploration of perovskite precursor chemistry and its effects on photovoltaic performances has been limited thus far. Herein, we modified the equilibrium of chemical species inside the precursor solution using different photoenergy and heat pathways to identify the corresponding perovskite film formation. The illuminated perovskite precursors exhibited a higher density of high-valent iodoplumbate species, resulting in the fabricated perovskite films with reduced defect density and uniform distribution. Conclusively, the perovskite solar cells prepared by the photoaged precursor solution had not only improved PCE but also enhanced current density, confirmed by device performance, conductive atomic force microscopy (C-AFM), and external quantum efficiency (EQE). This innovative precursor photoexcitation is a simple and effective physical process for boosting perovskite morphology and current density.