Publications by authors named "Fumeng Ren"
Article Synopsis
- - Formamidinium-cesium lead triiodide (FACsPbI) perovskite shows great potential for solar cells, but defects on its surface limit efficiency.
- - Researchers studied how alkylamine-modified pyridine derivatives can passivate these surface defects, finding that 3-(2-aminoethyl)pyridine (3-PyEA) is the most effective at reducing impurities and defects.
- - Using 3-PyEA improves the performance of inverted FACsPbI solar cells, achieving a power conversion efficiency of up to 25.65% and maintaining 96.5% efficiency after 1800 hours of operation in real-world conditions.
Article Synopsis
- - All-perovskite tandem solar cells could exceed the efficiency limits of traditional solar cells, but their performance is currently restricted by defects that cause energy losses in the material.
- - Researchers developed a method using a surface polishing agent and a passivator to fix defects in Sn-Pb mixed perovskite films, improving the film quality and reducing non-radiative energy loss.
- - The optimized solar cells achieved power conversion efficiencies of 22.65% and 23.32%, with a certified efficiency of 28.49% for two-junction all-perovskite tandem cells, indicating significant progress in solar technology.
Perovskite solar cells with an inverted architecture provide a key pathway for commercializing this emerging photovoltaic technology because of the better power conversion efficiency and operational stability compared with the normal device structure. Specifically, power conversion efficiencies of the inverted perovskite solar cells have exceeded 25% owing to the development of improved self-assembled molecules and passivation strategies. However, poor wettability and agglomeration of self-assembled molecules cause interfacial losses, impeding further improvement in the power conversion efficiency and stability.
View Article and Find Full Text PDFIn recent years, perovskite solar cells (PSCs) have attracted significant attention due to their excellent photoelectric properties. However, several key performance parameters of these devices still fall short of their theoretical limits. Among these parameters, the regulation of open-circuit voltage (V) has been a focal point of intensive research efforts, playing a pivotal role in advancing the efficiency of PSCs.
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- * The design features a chemically inert bismuth electrode and an aluminum oxide/parylene thin-film encapsulation to minimize halide loss and gas release.
- * Results show that these encapsulated solar cells retain 90% efficiency after 5200 hours at 45°C and 93% efficiency after 1000 hours at 75°C, demonstrating significant stability under stress conditions.
Effective p-type doping is essential to enhance hole transport and balance electron-hole injection in quantum dot light-emitting diodes (QLEDs). Here, an oligothiophene material is adopted as a p-type dopant in the hole-transport layer, considering its cruciform cross-center structure, precise molecular weight, and high purity. Compared with the dopant-free counterpart, hole transport capability at the optimal doping level exhibits a significant improvement, producing a boosted external quantum efficiency (EQE) and luminance up to 20.
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