Browsing by Author "Burimart S."

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    Mechanical and Electrical Comparative Studies of Widely Utilized Solar Perovskite Thin Films via Scanning Probe Microscopy
    (2023-01-01) Pansa-Ngat P.; Kamnoedmanee S.; Semapet N.; Sinthiptharakoon K.; Suwanchawalit C.; Burimart S.; Seriwattanachai C.; Shin Thant K.K.; Kanjanaboos P.; Pansa-Ngat P.; Mahidol University
    Most perovskite publications explore only one or two perovskite formulas to achieve good performance and/or stability. In contrary, this work aims to provide fair comparisons among different popularized perovskite recipes (MAPbI3, FAPbI3, FA0.1MA0.9PbI3, Cs0.2FA0.8PbI2.25Br0.75, Cs0.05FA0.81MA0.14PbI2.55Br0.45, and (PEA)2MA39Pb40I121) on the basis of mechanical and electrical properties together with deformation and stability via force curve analysis, photoconductive atomic force microscopy (c-AFM), Kelvin probe force microscopy (KPFM), and Raman spectroscopy. Using the c-AFM approach together with cantilever-sample interaction, the nanoscale Young’s modulus, adhesion force, and photogenerated current mapping with and without reverse bias potential of the six distinct perovskites are investigated. Sheet resistance and hardness test results further expand thin films’ physical comprehension, relating to future applications in flexible electronics. Additionally, the work function distributions of perovskites are explored via KPFM. Surface terminations, along with lattice contraction and octahedral tilting, cause changes in work function. Lastly, c-AFM was used to investigate the charge-morphology evolution under heat treatment. Triple-cation perovskites present themselves as the most robust system by striking the right balance between structural deformation and cationic rotation, with good current stability under heat and high resistance to plastic deformation.
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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.
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    Solvent-Tailored Carbon Paste for Effective Carbon-Based Perovskite Solar Cells
    (2025-01-01) Naikaew A.; Burimart S.; Srathongsian L.; Seriwattanachai C.; Sakata P.; Choodam K.; Khotmungkhun K.; Kanlayakan W.; Pansa-Ngat P.; Thant K.K.S.; Kanlayapattamapong T.; Ruankham P.; Nakajima H.; Supruangnet R.; Kanjanaboos P.; Naikaew A.; Mahidol University
    Printable planar carbon electrodes present a cost-effective and highly promising alternative to thermally evaporated metals, serving as the rear contact for stable perovskite solar cells (PSCs). However, the power conversion efficiencies (PCEs) of the carbon-based PSCs (C-PSCs) are notably lower compared to those of state-of-the-art PSCs. The inferior contact between the carbon electrode and the underlying layer contributes to the performance loss. Here, we developed scalable doctor-bladed carbon electrode by simultaneously incorporating 4 wt% carbon black and utilizing toluene (TLE) solvent engineering to a commercial carbon paste, resulting in improved flexibility and conductivity while yielding reduction of resistivity by 50% measured via a 4-point probe. Consequently, the carbon sheet can efficiently adhere the underlying hole-transporting layer by a simple pressing technique, significantly boosting charge transfer across the interface. The TLE device achieves a champion PCE of 15.77% with an ultralow hysteresis index (HI) of 0.027, compared to the solvent-free device which has a HI of 0.176. The developed carbon-based device exhibits notably improved long-term stability when subjected to dark conditions and 40-50% RH, sustaining 82% of its initial efficiency after 24 days without encapsulation with minimal declines in Jsc and Voc.