Related references
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Article
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Jiawen Wu et al.
Summary: This study demonstrates the use of one-dimensional (1D) perovskitoid BZPbI3 to modify the structure of the 4F-PEA)2(FA0.3MA0.7)4Pb5I16 perovskite, resulting in a 1D/2D mixed low-dimensional perovskite with desirable phase distribution, crystal orientation, and defect density. The 1D BZPbI3 also improves the electrical quality and stability of the solar cells, leading to a power conversion efficiency of nearly 20% and excellent long-term operational stability.
ACS ENERGY LETTERS
(2023)
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Yeyong Wu et al.
Summary: Flexible perovskite solar cells are a promising option to complement silicon solar cells in the photovoltaic market, but their power conversion efficiencies and mechanical stability are lower than industry standards. By using an in situ crosslinking bis((3-methyl-oxetan-3-yl) methyl) thiophene-2,5-dicarboxylate, the quality of perovskite can be finely regulated in real time. The resulting perovskite film exhibits enhanced grain size, compact stacking, and a preferential crystal orientation, while the crosslinked elastomer polymer effectively releases mechanical stress. This leads to a flexible perovskite solar cell with a record power conversion efficiency of 23.4% (certified 22.9%) and robust bending durability.
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Qing Dai et al.
Summary: This study successfully controlled solvent volatilization to achieve high-quality crystallization of two-dimensional perovskites with full coverage and lateral homogeneity. It was found that variations in solvent evaporation rate resulted in lateral film coverage gradients, affecting the growth uniformity and photovoltaic efficiency of the films. By adjusting the temperature of the casting perovskite precursor, film inhomogeneity and device performance variation could be alleviated. Regulating the radial morphology of hot-casting thin films enables coating techniques amenable to solution processes for robust reproducibility.
ACS APPLIED ENERGY MATERIALS
(2023)
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Bao-Shi Qiao et al.
Summary: Stacked 2D perovskites offer new possibilities for next generation photodetectors with enhanced features. This study demonstrates a bifunctional perovskite-based photovoltaic detector capable of demultiplexing two wavelengths. By utilizing the photosensitive and dielectric properties of 2D perovskite, the device exhibits different modes of operation. It shows continuous photoresponse under 405 nm and a transient spike response to longer wavelength visible light. This work provides a new strategy for multispectral detection and demultiplexing, which can improve data transfer rates and encrypted communications.
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Fei Zhu et al.
Summary: By utilizing the thermal-pressed effect, the film quality of 2DRP perovskite was significantly improved with enhanced charge transport/extraction and reduced trap density, leading to higher power conversion efficiency and excellent performance stability.
ACS APPLIED MATERIALS & INTERFACES
(2022)
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Xin Zhou et al.
Summary: The study investigates the passivation mechanism of a bifunctional organic molecule MPA on defects within perovskite absorbers, reducing defect density and recombination loss through synergistic passivation of two functional groups. This results in improved efficiency and environmental tolerance of PSCs.
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(2022)
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Sankaran Ramesh et al.
Summary: The authors successfully engineered the energy cascade manifold of quantum well states in quasi-2D Ruddlesden-Popper perovskites by tuning the organic spacer, resulting in a slower excess energy loss rate and efficient carrier extraction. 2D electronic spectroscopy provided insights into the structural and energetic disorder of these materials. The choice of the organic spacer is crucial for tailoring the coherent coupling between quantum wells and influencing the competition between the energy cascade and charge extraction.
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Huanhuan Yao et al.
Summary: By introducing phenylethylammonium cation (PEA(+)) as steric hindrance, 2D Ruddlesden-Popper (RP) structures exhibit stronger phase stability compared to 3D CsPbI3. A surface engineering (USE) method is proposed to improve coverage and phase management, leading to a significant increase in power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). This method also shows versatility in enhancing the performance of other 2D CsPbI3 PSCs, indicating potential for future commercial applications.
Review
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Qingli Cao et al.
Summary: Two-dimensional perovskites have gained extensive attention in the field of photovoltaics due to their intrinsic stability and tunability. Despite achieving high stability and conversion efficiency, the efficiency of 2D perovskite solar cells lags behind their 3D counterparts. This review focuses on the structural aspects of different types of 2D halide perovskites and discusses the influence of spacer physical characteristics on their performance, while exploring strategies for selecting novel spacers.
Article
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A. Urbaniak et al.
Summary: This study investigates the interpretation of capacitance spectroscopy results in perovskite-based solar cells. The research argues that the signals observed in these cells result from anion migration rather than from deep trap energy levels, based on deep level transient spectroscopy and admittance spectroscopy results. The parameters of anion migration, such as activation energy and ion concentration, are calculated and compared to theoretical values for different migration paths in perovskites. These parameters change over time and reflect in cell degradation, which is proposed to be linked to a change in the anion migration path in perovskite.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
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Luyao Zheng et al.
Summary: This study demonstrates that the combination of three-dimensional and two-dimensional perovskites can create a bilayer structure that enables stable and efficient perovskite solar cells. The results show that discrete two-dimensional perovskite crystals on the surface of the three-dimensional perovskite film improve water resistance without sacrificing optoelectronic properties, resulting in over 23% power conversion efficiency and increased stability.
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Yunfan Yue et al.
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CHEMICAL ENGINEERING JOURNAL
(2022)
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Yan Zhan et al.
Summary: Metal halide perovskites have great potential in portable and wearable optoelectronics, but their brittleness affects device performance. Researchers have developed flexible perovskite thin films by combining polymer and imprinting techniques, resulting in enhanced crystalline quality and light absorption. They achieved a high responsivity and detectivity photodetector with good flexibility.
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Lvpeng Yang et al.
Summary: This study reports a simple strategy to achieve efficient charge transport in quasi-two-dimensional perovskite solar cells by controlling crystal orientation and phase composition. The results show that the synergistic effect of crystal orientation control and additive regulation leads to the formation of highly conductive pathways, improving charge collection and transport efficiency. This study highlights the importance of controlling crystal orientation and multiphase distribution for enhancing the efficiency of quasi-two-dimensional perovskite solar cells.
ACS APPLIED ENERGY MATERIALS
(2022)
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Yuqi Hao et al.
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Bin Chen et al.
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Weiyu Kong et al.
Summary: This study improves the performance of formamidinium (FA) based low-n 2D perovskite solar cells by fine-tuning the crystallization and quantum well orientation. The addition of NH4+ and SCN- additives significantly delays the crystallization of low-n phases and promotes the growth of quantum well structures with vertical orientation. The optimized device achieves a high power conversion efficiency and shows excellent stability under harsh conditions.
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(2022)
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Francesco Furlan et al.
Summary: Tuning the halide composition in perovskites has been shown to enhance the performance of perovskite photovoltaic devices. This study investigates whether similar strategies can improve the performance of perovskite photodetectors. The results show that increasing the bromide content leads to a reduction in dark current and improved detection performance. The superior performances of bromide-containing devices are attributed to reduced trap states, better charge extraction, and improved morphology and crystallinity of the photoactive layer.
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Zheng Yang et al.
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Linjuan Guo et al.
Summary: 2D RP perovskite ferroelectric films were successfully synthesized and passivated using an in-situ reaction with 4-fluoro-phenylethylamine iodide. The resulting films exhibited outstanding hydrophobic properties, and the fabricated self-powered photo-detectors demonstrated excellent optoelectronic performances and high stability.
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Yu Zhou et al.
Summary: This study presents a wearable UV wristband based on a self-powered flexible perovskite photodetector for real-time UV monitoring. The wristband demonstrates excellent UV detection performance, outstanding mechanical robustness, and desirable operational stability, which can be displayed and recorded on a smartphone to prevent prolonged UV exposure.
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Jun Liu et al.
Summary: This study investigates the defect states of wide bandgap inorganic perovskite CsPbI3-xBrx and finds that prolonged storage under low-humidity conditions can significantly reduce deep-level interstitial defects. The self-healing process assisted by ion migration is proposed to explain the defect mitigation mechanism. Furthermore, device characterization and simulation confirm the importance of defect mitigation in improving device performance.
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(2022)
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Yunseong Choi et al.
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ENERGY & ENVIRONMENTAL SCIENCE
(2022)
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Jia Li et al.
Summary: Adding a trace amount of PEG additive into the CsPbI2Br precursor solution efficiently passivates interfacial defects through Lewis acid-base interaction, leading to a significant reduction in trap density of state and suppression of noise current in perovskite photodetectors. This passivation strategy results in improved specific detectivity and linear dynamic range, demonstrating the feasibility of utilizing PEG as a polymeric additive for high photodetection performance in all-inorganic perovskite photodetectors.
ACS APPLIED MATERIALS & INTERFACES
(2021)
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Physics, Applied
Yi Yang et al.
Summary: High-performance lead-free photodetectors were developed via a one-step spin coating method, showing outstanding stability and excellent performance in terms of dark current, on/off ratio, and detectivity. The low Sn4+ self-doping and high-performance optoelectronic properties of FA-based perovskite contributed to the exceptional device performance.
APPLIED PHYSICS LETTERS
(2021)
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Xiaotong Li et al.
Summary: This review provides guidelines on choosing spacers and incorporating them into crystalline materials and optoelectronic devices for two-dimensional halide perovskites. The comprehensive understanding of the effects of spacers on structure, properties, and device performance can accelerate the discovery and application of novel 2D materials in high-performance devices.
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Ping Fu et al.
Summary: Merging DJ phase and RP phase to construct a DJ:RP double-phase perovskite structure can improve the efficiency and stability of 2D PSCs by facilitating crystal growth, suppressing charge recombination, and improving charge transport.
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Jun Yang et al.
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