Browsing by Author "Chotchuangchutchaval T."

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    Cs and Br tuning to achieve ultralow-hysteresis and high-performance indoor triple cation perovskite solar cell with low-cost carbon-based electrode
    (2024-04-19) Srathongsian L.; Kaewprajak A.; Naikaew A.; Seriwattanachai C.; Phuphathanaphong N.; Inna A.; Chotchuangchutchaval T.; Passatorntaschakorn W.; Kumnorkaew P.; Sahasithiwat S.; Wongratanaphisan D.; Ruankham P.; Supruangnet R.; Nakajima H.; Pakawatpanurut P.; Kanjanaboos P.; Srathongsian L.; Mahidol University
    With high efficacy for electron-photon conversion under low light, perovskite materials show great potential for indoor solar cell applications to power small electronics for internet of things (IoTs). To match the spectrum of an indoor LED light source, triple cation perovskite composition was varied to adjust band gap values via Cs and Br tuning. However, increased band gaps lead to morphology, phase instability, and defect issues. 10% Cs and 30% Br strike the right balance, leading to low-cost carbon-based devices with the highest power conversion efficiency (PCE) of 31.94% and good stability under low light cycles. With further improvement in device stack and size, functional solar cells with the ultralow hysteresis index (HI) of 0.1 and the highest PCE of 30.09% with an active area of 1 cm2 can be achieved. A module from connecting two such cells in series can simultaneously power humidity and temperature sensors under 1000 lux.
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    Ferrocene Interlayer for a Stable and Gap-Free P3HT-Based Perovskite Solar Cell as a Low-Cost Power Source for Indoor IoTs
    (2025-01-01) Seriwattanachai C.; Sahasithiwat S.; Chotchuangchutchaval T.; Srathongsian L.; Wattanathana W.; Ning Z.; Phuphathanaphong N.; Sakata P.; Shin Thant K.K.; Sukwiboon T.; Inna A.; Kanlayapattamapong T.; Kaewprajak A.; Kumnorkaew P.; Supruangnet R.; Wongpinij T.; Nakajima H.; Wongratanaphisan D.; Pakawatpanurut P.; Ruankham P.; Kanjanaboos P.; Seriwattanachai C.; Mahidol University
    Although poly(3-hexylthiophene-2,5-diyl) (P3HT) with its stability-boosting hydrophobic surface is a promising low-cost alternative dopant-free hole transport material for n-i-p perovskite solar cells (PSCs), the P3HT-based PSCs suffer from surface energy mismatch between hydrophilic perovskite and hydrophobic P3HT, which results in interlayer gap, poor electronic contact, and poor charge extraction. In this study, low-cost ferrocene (Fc) acts as an interlayer at the perovskite/P3HT interface, inducing the replacement of the hydrophobic edge-on stacking of alkyl side chains with the hydrophilic π-π stacking of thiophene rings within the P3HT structure to mitigate such an energy mismatch. With an optimal amount of Fc, an average PCE of 23.6% has been achieved under indoor light at 1000 lux in comparison to 20.6% of P3HT-based PSCs without Fc. In addition, an unencapsulated device with the interlayer can retain 80% of initial PCE (T80) over 12 months in the dark with 70% RH, longer than T80 of 8 months without Fc. Finally, a Bluetooth sensor module is powered by three Fc-passivated P3HT-based PSCs connected in series to demonstrate the capacity of replacing batteries used for the Internet of Things (IoTs).