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Summary: The open-circuit voltage deficit in wide-bandgap perovskite solar cells is larger than in perovskites with a bandgap of approximately 1.5 eV. The limiting factor for the open-circuit voltage is found to be recombination at the electron-transport-layer contact, resulting from inhomogeneous surface potential and poor energetic alignment. To address this issue, a new surface treatment using diammonium molecules is introduced to achieve a more uniform distribution of surface potential.
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Rui He et al.
Summary: All-perovskite tandem solar cells exhibit high power conversion efficiency and low cost. The efficiency improvement in small-area tandem solar cells is driven by advances in low-bandgap perovskite bottom subcells. However, wide-bandgap perovskite top subcells still face issues, especially in large-area tandem solar cells. In this study, a self-assembled monolayer of (4-(7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid is developed as a hole-selective layer for wide-bandgap perovskite solar cells, which enables efficient hole extraction. By integrating this layer, a high efficiency monolithic all-perovskite tandem solar cell with a large area is achieved.
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Summary: Perovskite-based tandem solar cells have attracted increasing interest due to their potential to surpass the Shockley-Queisser limit for single-junction solar cells. Wide-bandgap perovskites act as front absorbers in tandem architectures, offering higher open-circuit voltage and reduced thermalization losses. The main challenges for wide-bandgap perovskite solar cells (PSCs) include large open-circuit voltage deficit and severe photo-induced phase separation. Recent research efforts have made significant progress in addressing these issues and improving the efficiency and stability of wide-bandgap PSCs for tandem applications.
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Summary: In this study, the researchers found that residual strain is the key factor affecting the efficiency and stability of wide-bandgap perovskite solar cells. Dimethyl sulfoxide addition helps eliminate lattice mismatch, leading to high-efficiency devices with record efficiencies of 22.28% and 20.45%. These devices also exhibit excellent stability, retaining 90-95% initial efficiency over 4000 hours and 80-90% initial efficiency over 700 hours. The perovskite/Si tandem structure achieves an efficiency of more than 28.3%.
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Xin Yu Chin et al.
Summary: Silicon solar cells are reaching their efficiency limit of 29%, but this can be surpassed by using advanced device structures. In this study, we created a tandem device with a perovskite layer on top of a silicon bottom cell to enhance the photocurrent. By regulating the perovskite crystallization process and reducing recombination losses, we achieved a certified power conversion efficiency of 31.25% with an active area of 1.17 square centimeters.
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Summary: This study presents a synergistic strategy using lead chloride (PbCl2) and phenethylammonium chloride (PMACl) to introduce chlorine (Cl) into the material and form a two-dimensional (2D) phase, reducing the open-circuit voltage (V-OC) deficit and improving stability and efficiency.
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Qi Jiang et al.
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Jiang Liu et al.
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Wei Hui et al.
Summary: A new method for synthesizing stable black-phase formamidinium lead iodide (α-FAPbI(3)) was reported, which enables the stable synthesis of α-FAPbI(3) under high temperature and humidity conditions, and maintains high efficiency under light stress.
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Qi Cao et al.
Summary: This study introduces a star-shaped polymer to enhance charge transport and inhibit ion migration in perovskite solar cells, leading to improved efficiency and stability. Modified devices demonstrate significant performance enhancements and excellent long-term operational stability.
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