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oe1(光电查) - 科学论文

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  • Improving Low Bandgap Tin Lead Perovskite Solar Cells via Contact Engineering and Gas Quench Processing

    摘要： Low bandgap Sn/Pb ABX3 perovskites have reached photovoltaic power conversion efficiencies >20%, but usually have poor stability due to the common use of acidic PEDOT:PSS hole transport layers and A-site cation compositions containing methylammonium (MA). Here, we develop a process to enable high quality MA-free Sn/Pb perovskite films grown using a gas quenching process instead of the conventional antisolvents, which provides improved control of the film growth and eliminates wrinkling. Using this method in a device structure with PTAA instead of PEDOT:PSS as the hole transport layer, devices can reach efficiencies up to 20%mppt at 0.06 cm2 and up to 17.5%mppt at 1 cm2 active area. With these improvements, the devices are characterized for thermal stability and show 80% of the initial power remaining after 4000 hours at 85°C.

    关键词： Low bandgap,Tin Lead Perovskite,Gas Quench Processing,Contact Engineering,Solar Cells

    更新于2025-09-23 15:19:57

  • Reviving Neara??Infrared Emission for Sna??Pb Alloyed Perovskite Quantum Dots by Sodium Doping

    摘要： Phase-stable CsSnxPb1-xI3 perovskite quantum dots (QDs) hold great promise for optoelectronic applications owing to their strong response in the near-infrared region. Unfortunately, optimal utilization of their potential is limited by severe photoluminescence (PL) quenching, leading to extremely low quantum yields (QYs) of ~0.3%. Ultra-low sodium (Na) doping presented in this work is found to be effective in improving PL QYs of these alloyed QDs without alerting their favorable electronic structure. X-ray photoelectron spectroscopy (XPS) studies suggest the formation of a stronger chemical interaction between I- and Sn2+ ions upon Na doping, which potentially helps to stabilize Sn2+ and suppresses the formation of I vacancy defects. The optimized PL QY of the Na-doped QDs reaches up to ~28%, almost two orders of magnitude enhancement compared with the pristine one.

    关键词： doping,near-infrared emission,nanoparticles,tin-lead perovskite

    更新于2025-09-19 17:13:59

  • Reviving Near-Infrared Emission for Sn-Pb Alloyed Perovskite Quantum Dots by Sodium Doping

    摘要： Phase-stable CsSnxPb1-xI3 perovskite quantum dots (QDs) hold great promise for optoelectronic applications owing to their strong response in the near-infrared region. Unfortunately, optimal utilization of their potential is limited by severe photoluminescence (PL) quenching, leading to extremely low quantum yields (QYs) of ~0.3%. Ultra-low sodium (Na) doping presented in this work is found to be effective in improving PL QYs of these alloyed QDs without alerting their favorable electronic structure. X-ray photoelectron spectroscopy (XPS) studies suggest the formation of a stronger chemical interaction between I- and Sn2+ ions upon Na doping, which potentially helps to stabilize Sn2+ and suppresses the formation of I vacancy defects. The optimized PL QY of the Na-doped QDs reaches up to ~28%, almost two orders of magnitude enhancement compared with the pristine one.

    关键词： doping,near-infrared emission,nanoparticles,tin-lead perovskite

    更新于2025-09-16 10:30:52

  • Tandems in the thick of it

    摘要： Two-terminal all-perovskite tandem structures are promising as low-cost yet highly efficient solar cells, but their development is limited by the poor quality of the low bandgap absorber layer. Now, a processing method has been shown to enable the production of uniform, thick tin–lead perovskite layers, which translate into improved photovoltaic parameters.

    关键词： perovskite photovoltaics,low bandgap absorber,power conversion efficiency,tin–lead perovskite,tandem solar cells

    更新于2025-09-09 09:28:46