Related references
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Article
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Chunqing Ma et al.
Summary: Many studies have been conducted to improve the stability of perovskite films, but the role of different perovskite crystal facets in stability remains unknown. In this study, we investigate the underlying mechanisms of facet-dependent degradation of formamidinium lead iodide (FAPbI3) films. We find that the (100) facet is more susceptible to moisture-induced degradation than the (111) facet. Through experimental and theoretical studies, we uncover the degradation mechanisms and observe a d-phase transition on the (100) facet due to strong water adhesion and elongated lead-iodine (Pb-I) bond distance. Manipulating the crystal structure to achieve a higher fraction of the (111) facet leads to exceptional stability of FAPbI3 films against moisture. Our findings provide insights into unknown facet-dependent degradation mechanisms and kinetics.
Article
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Summary: The main culprits causing poor stability and non-radiative charge recombination in inorganic perovskite solar cells (PSCs) are identified on the surface of the perovskite material. A new passivator, BMBC, is designed to suppress halide vacancies and coordinate with undercoordinated Pb2+ through Lewis base-acid reactions. This passivation method reduces surface trap density, increases grain size, prolongs charge lifetime, and achieves more suitable energy-level alignment, resulting in increased efficiency and improved stability of the PSCs.
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(2023)
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Summary: In this study, a novel spiro-type HTM named DP was developed by substituting four anisole units on Spiro with 4-methoxybiphenyl moieties, improving the performance of perovskite solar cells. The DP-based PSC achieved high power conversion efficiencies of 25.24% for small-area devices and 21.86% for modules, with a certified efficiency of 21.78% on a designated area. The encapsulated DP-based devices maintained 95.1% of the initial performance after 2560 hours under ISOS-L-1 conditions and 87% under ISOS-L-3 conditions over 600 hours.
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Huaxin Wang et al.
Summary: This study investigates the control of crystallization kinetics and halide ion migration in CsPbIBr2 perovskite solar cells through the modulation of chlorobenzene antisolvent and bis(pentafluorophenyl)zinc additive. The addition of Zn(C6F5)2 significantly reduces phase segregation in CsPbIBr2 films, as observed from photoluminescence and absorption spectra. Furthermore, the modified CsPbIBr2 PSCs exhibit a power conversion efficiency of 12.57% with negligible hysteresis and increased stability. Under 1-m-deep water, the PCE of CsPbIBr2 PSCs reaches 14.18%. These findings provide insights into the development of phase-segregation-free CsPbIBr2 films and demonstrate the potential applications of CsPbIBr2 PSCs in underwater power systems.
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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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Hui Zhou et al.
Summary: Surmounting complicated defects at ETL and perovskite interface is crucial for enhancing efficiency and stability of PSCs. An asymmetric interface modification strategy (AIMS) is developed, incorporating 1,3-thiazole-2,4-diammonium (TDA), to passivate defects on both SnO2 ETL and perovskite buried surface. TDA with nitrogen atoms (N3 and N1) in the structure selectively cures different types of defects, resulting in a champion PCE of 24.96% and remarkable operational stability.
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Summary: It is found that using a compound called DED can effectively reduce defects in CsPbI3 films and suppress ion migration, thereby improving the performance and stability of perovskite solar cells. Experimental results show that CsPbI3 cells treated with DED exhibit excellent performance, with a champion PCE of 21.15%.
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(2023)
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Haofeng Zhang et al.
Summary: CsPbI3 all-inorganic perovskite has better thermal stability than organic-inorganic hybrid counterparts, but suffers from an energy band mismatch with SnO2. By complexing SnO2 nanocrystals with ethoxylated polyethyleneimine (PEIE), the band structure of SnO2 can be adjusted to align with CsPbI3, leading to improved performance. The introduction of PEIE also promotes the growth of CsPbI3 films and enhances charge extraction, resulting in a significantly increased power conversion efficiency. This work provides a simple strategy to produce high-performance CsPbI3 all-inorganic perovskite solar cells with a low-temperature solution process.
JOURNAL OF ALLOYS AND COMPOUNDS
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Summary: Interfacing with fluorinated aniliniums can enhance the performance and stability of perovskite solar cells under high temperature and humidity conditions.
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Summary: The effect of the chemical structure of two new hole transporting materials (HTMs) on their molecular and photovoltaic properties has been studied. One of the HTMs (spiro-cyclOMe) demonstrated higher hole mobility and thermal stability. It also showed better performance in perovskite solar cells (PSCs) with a power conversion efficiency (PCE) of over 23%.
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Summary: This review discusses the strategies and progress in stabilizing the CsPbI3 perovskite structure and improving the stability of CsPbI3 perovskite solar cells. It covers topics such as ionic incorporation, regulating surface energy, incorporating low-dimensional perovskites, and surface termination. The challenges and opportunities of all-inorganic CsPbI3 perovskite are also briefly mentioned.
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Summary: This study reports a method to form highly stable CsPbI3 films by introducing ions with different sizes, which can inhibit the formation of the yellow δ-phase and promote the development of the black α-phase. The resulting perovskite solar cells exhibit high efficiency and stability.
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Summary: A novel compound HADI was designed to improve the efficiency and stability of flexible perovskite solar cells, showing significant roles in surface modification, passivation, and charge transfer. PSCs based on HADI-SnO2 electron transport layer exhibited outstanding performance.
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Summary: The study demonstrates that phenyltrimethylammonium iodide (PTAI) and its corresponding low-dimensional perovskites exhibit excellent thermal stability and effectively suppress non-radiative recombination of CsPbI3, resulting in improved efficiency and stability of PSCs.
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Summary: In this study, hydrogen octylphosphonate potassium (KHOP) was used as an additive to passivate defects in perovskite films, leading to improved power conversion efficiency. The molecule coordinated with Pb, effectively passivating Pb2+ defects and inhibiting the production of Pb0. The presence of K+ also reduced device hysteresis and improved moisture stability.
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Summary: This review summarizes the rapid development and commercialization of perovskite solar cells (PSCs), including the recent progress in device structures, perovskite-based tandem cells, large-area modules, stability, applications, and industrialization. The challenges and perspectives for the commercialization of PSCs in the near future are also discussed.
SCIENCE CHINA-CHEMISTRY
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Summary: CsPbI3 all-inorganic perovskite has superior thermal stability compared to its organic-inorganic hybrid counterparts. However, it suffers from phase instability when exposed to moisture. By engineering the additives in the hole transport material (HTM), the phase transition of CsPbI3 can be accelerated or mitigated, leading to improved stability and performance of solar cells.
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(2022)
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Chunxiong Bao et al.
Summary: In this article, we review the progress in defect-related physics and techniques for metal halide perovskites. We discuss the impact of defects on device performance and the mechanisms of defect treatment, and summarize the key challenges and opportunities of defects in the further development of perovskite optoelectronic devices.
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Hui Lu et al.
Summary: In this study, the introduction of low concentration of Lewis acid-base adducts (LABAs) is reported to enhance the performance and stability of all-inorganic cesium-lead-iodide (CsPbI3Br3-x (2 < x < 3)) perovskite solar cells. The noncoordinating anions PF6- as a Lewis base effectively passivate iodide vacancy defects, and N-propyl-methyl piperidinium (NPMP+) can regulate crystal growth and decrease trap density. The LABAs strategy improves the power conversion efficiency of CsPbTh3 solar cells to 19.02% and maintains a high efficiency after 60 days of aging.
Article
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Kai-Li Wang et al.
Summary: By employing solvent molecular sieves, a manipulating strategy is demonstrated to simultaneously achieve rapid nucleation and slow crystal growth of perovskite films. This strategy forms a molecular layer on the perovskite surface to control solvent evaporation through molecule-solvent interactions, resulting in improved device performance by effectively passivating surface defects.
ADVANCED ENERGY MATERIALS
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Sheng Zhan et al.
Summary: In this study, a bifunctional passivator, MBrA, was designed and used to modify FAMAPbI(3) perovskite material, reducing defect density, tuning energy levels, and improving the efficiency and stability of the solar cell.
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Zhenyu Chen et al.
Summary: All-inorganic CsPbIBr2 perovskite solar cells have attracted worldwide interest due to their excellent thermal stability. This study investigates the passivation effect and band alignment of a rubidium acetate interface layer at the electron transport layer/perovskite and perovskite/hole transport layer interfaces. The introduction of rubidium acetate improves the film quality and electron extraction at the electron transport layer/perovskite interface, and passivates grain boundary defects and reduces nonradiative recombination at the perovskite/hole transport layer interface. The modified solar cells achieve a champion efficiency of 12.11%.
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Jifeng Yuan et al.
Summary: A novel CsPbI3 precursor with TP-ligands successfully suppresses the formation of V-I defects in the perovskite film, leading to a high-quality film with increased carrier transmission channels, thereby enhancing the efficiency and stability of solar cells.
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Summary: This study investigates the defect-capture capacity of perovskite material and proposes a method to reduce the defect-capture radius by using highly polarized fluorinated species. By modulating the dielectric properties, the power-conversion efficiency and long-term stability of perovskite solar cells are greatly improved.
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ACS ENERGY LETTERS
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Summary: In this study, two organic molecules were designed and synthesized to modify the perovskite films in order to improve the efficiency and long-term stability of perovskite solar cells. The modified devices showed higher power conversion efficiency and maintained their initial performance after long-term storage.
CHEMICAL ENGINEERING JOURNAL
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