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Indenea??C <sub/>60</sub> Bisadduct Electron Transporting Material with the High LUMO Level Enhances Open-Circuit Voltage and Efficiency of Tin-Based Perovskite Solar Cells
摘要： Tin-based halide perovskite materials are promising eco-friendly light absorbers with similar optoelectronic properties to lead-based ones. However, their solar cells have suffered from considerably low open-circuit voltage (VOC) arising from mismatched energy levels between tin-based perovskite and charge-transporting layers because they imitate typical device structures developed for lead-based ones. Herein we report the unoccupied molecular orbital (LUMO) level of electron transporting layer (ETL) significantly affects VOC of tin-based perovskite solar cells (PSCs) in contrast to lead-based ones. The indene?C60 bisadduct (ICBA) ETL with the much higher LUMO level than typical ETLs decreases an energy off-set with the conduction band minimum of mixed formamidinium/phenylethylammonium tin iodide (FA0.9PEA0.1SnI3)-based perovskite material. The resultantly reduced VOC loss at their interface gives a VOC of 0.651 V, the highest to date for FASnI3-based PSCs. An achieved champion PCEs reaches 7.05%. This result highlights the importance of redesigning device structures dedicated to tin-based PSCs.
关键词： open-circuit voltage,electron transportation,perovskite solar cells,lead-free,tin
更新于2025-09-23 15:21:01
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Ionic selective contact controls the charge accumulation for efficient and intrinsic stable planar homo-junction perovskite solar cells
摘要： The under-coordinated ionic defects at the surface and grain boundaries of organic-inorganic halide perovskite always attract and trap the free carriers via the electrostatic force and accelerate the ions migration by defect vacancies channels, significantly limiting the charge extraction efficiency and intrinsic stability of perovskite solar cells (PSCs). Here, a novel strategy of ionic layer induced homo-junction perovskite reinforced the build in field (Ebi) is proposed to further decrease trap recombination and suppress the ions migration, thereby enhancing the power conversion efficiencies (PCEs) and intrinsic stability of PSCs. Experiments and theories certify that the adsorbed cations and anions will not only give rise to interface charge accumulation/depletion of perovskite, resulting in boarder distributed and reinforced Ebi, but also increased the interface ions vacancy migration barriers via the extra ionic interaction. As a result, the resultant n-i-p PSCs showed a record PCE of 20.88% among the organic electron transfer layer (ETL) and deliver a high stability of 88% after aged 60 days in atmosphere without encapsulation. Our findings provide a new insight to further eliminate the side effect of ionic defects and guide to design newly contact interface to minimize the trap recombination and ions motion induced intrinsic stability of PSCs.
关键词： intrinsic stability,organic electron transportation layer,perovskite solar cell,band blending,surface ionic doping
更新于2025-09-11 14:15:04