Perovskite-Based Quantum Dot Tandem Solar Cells

Passivating perovskite solar cells (PSCs) through a novel interfacial layer that combines graphene quantum dots (GQDs) with copper-doped nickel oxide (Cu-NiOx) at the metal halide perovskite (MHP) surface. The GQDs interlayer suppresses defect-assisted recombination in the PSC, while the Cu-NiOx layer enhances charge transport. This integrated approach addresses the perovskite's inherent defects and interface issues, leading to improved photovoltaic performance.

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Flexible transparent perovskite solar cells through a double-sided cation exchange process that enables high-performance, semi-transparent solar cells with improved durability. The cells employ a graphene-based transparent electrode and a perovskite layer with a cation exchange region, where the perovskite layers are bonded through a double-sided lamination process. The cation exchange reaction enables the formation of a stable perovskite structure, while maintaining the solar cell's transparency. The lamination process involves hot pressing the perovskite layers together, with specific thickness and contact area considerations to optimize the exchange reaction. This approach enables the fabrication of high-efficiency, flexible solar cells with improved stability and durability compared to traditional solar cells.

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Perovskite solar cells with enhanced charge collection and stability through a ternary composition of Cs, FA, and MA. The composition, represented by the formula (1), combines lead halide perovskites with cesium, formamidinium, and methylammonium, achieving a narrower bandgap and improved light absorption beyond 800 nm. The perovskite film exhibits enhanced charge collection properties, enabling higher solar cell efficiency and stability compared to conventional Pb-based perovskites. The composition enables the formation of uniform films through controlled Sn doping, addressing the issue of uneven film formation in Pb-based perovskites. The solar cells incorporate the perovskite material, a hole transport layer, and a metal electrode, with the transparent electrode being made of a conventional material.

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All-perovskite tandem solar cell with improved carrier recombination management through a novel quantum well tunneling junction. The cell architecture features a transparent substrate, a perovskite top cell, a quantum well tunneling junction, and a bottom cell. The tunneling junction incorporates a spin-coated doped layer and a copper electrode, enabling efficient electron-hole recombination while maintaining carrier mobility. The cell structure combines the perovskite top cell with a narrow-bandgap bottom cell, maximizing photon absorption and reducing carrier recombination losses.

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High open-circuit voltage wide bandgap perovskite solar cells with improved stability and efficiency. The cells feature a conductive substrate with a perovskite light-absorbing layer, electron transport layer, and interface modification layer. The interface modification layer incorporates cross-linkable fullerene derivatives to enhance interface contact between the perovskite and electron transport layers, while the perovskite layer itself incorporates a passivated interface modification layer to prevent water and oxygen degradation. This configuration enables high open-circuit voltage perovskite solar cells with enhanced stability against environmental factors.

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Inorganic perovskite solar cells with enhanced light absorption through nanostructured back electrodes. The cells feature a photoactive layer with flat structure containing perovskite quantum dots, an organic hole transport layer with nanopatterns, and a back electrode with nanostructured patterns. The back electrode, formed through nanoimprint lithography, provides an additional light scattering pathway that significantly improves light absorption beyond conventional photoactive layer thickness limitations. This approach enables higher photoelectric conversion efficiencies compared to conventional perovskite solar cells.

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A stable and efficient all-inorganic perovskite quantum dot with enhanced photoluminescence quantum yield (PLQY) and superior stability. The quantum dot is prepared through a hot-injection method using cesium and lead sources, organic acids, and fluorine sources. The fluorine incorporation into the CsPbX3 lattice through CsF•3/2HF formation provides protection against environmental factors like humidity, light, and temperature, while maintaining high PLQY and single exponential decay. The resulting quantum dot exhibits excellent dispersibility, uniformity, and repeatability, making it suitable for applications in solar cells, lasers, and light-emitting diodes.

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Solar cells with enhanced stability and performance through a novel interface modification approach. The solar cell comprises a layered substrate, electron transport layer, perovskite light-absorbing layer, hole transport layer, and metal electrode, with an interface layer between the perovskite light-absorbing layer and the hole transport layer. The interface layer incorporates a short-chain aromatic acid-perovskite quantum dot composite material, which enhances hole transport properties while maintaining interface stability. This interface modification enables improved perovskite performance while addressing common issues associated with conventional perovskite solar cells.

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A stable and efficient all-inorganic fluoride perovskite quantum dot with improved luminescence characteristics. The quantum dots are synthesized through a novel hot injection method that combines cesium source, lead source, long alkyl chain organic acid, long alkyl chain organic amine, and trioctylamine. The synthesis process involves rapid cooling of the reaction mixture after hot injection, followed by post-processing to remove impurities. The resulting quantum dots exhibit enhanced stability, fluorescence quantum yield, and fluorescence lifetime compared to conventional perovskite quantum dots.

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Inverted perovskite solar cells with quantum dot hole transport layers achieve enhanced photovoltaic performance through the use of CdSe or CdS quantum dots as hole transport materials. The quantum dots are prepared through gas-hydrothermal synthesis and applied as a hole transport layer in the perovskite solar cell structure. This approach enables improved hole transport efficiency compared to conventional hole transport materials, leading to higher photovoltaic efficiency and stability in perovskite solar cells.

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Light absorption layer for solar cells that enhances efficiency through quantum dot incorporation. The layer comprises perovskite material and quantum dots with a specific ligand, specifically an aliphatic amino acid, which are combined in a controlled manner to minimize voids while maximizing quantum yield. The ligand is specifically designed to coordinate with the quantum dot surface, enabling efficient light absorption while maintaining structural integrity. The ligand is selectively incorporated into the perovskite material through a precise ligand exchange process, resulting in a uniform and efficient light absorption layer.

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A wide bandgap perovskite/narrow bandgap perovskite/quantum dot triple junction solar cell that achieves enhanced solar energy conversion through mechanical stacking of these materials. The cell comprises a wide bandgap perovskite layer, a narrow bandgap perovskite layer, and quantum dot layers stacked in a mechanical configuration. The wide bandgap perovskite layer enables efficient absorption across the solar spectrum, while the narrow bandgap perovskite layer enhances absorption in the visible region. The quantum dot layers provide additional light absorption capabilities. The mechanical stacking process enables high efficiency solar cells with reduced material preparation complexity compared to traditional tandem solar cells.

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Inorganic perovskite quantum dots with improved photovoltaic efficiency through controlled band tail suppression. The dots achieve this through selective purification using a polar antisolvent that selectively removes surface defects while preserving the dot's intrinsic properties. The purification process enables the formation of uniform quantum dot dispersions with precise size control, which is critical for achieving high-performance photovoltaic devices.

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Palladium-doped inorganic perovskite quantum dots encapsulated in silica, with improved quantum efficiency in the blue region through controlled doping and encapsulation. The encapsulation prevents diffusion-induced redshift and degradation, while maintaining the quantum confinement effect. The palladium doping enables enhanced fluorescence in the blue region, with peak emission at 456 nm. The encapsulation in silica provides a stable environment for the quantum dots, enabling their use in thin-film applications without compromising device performance.

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Non-lead double perovskite solar cells with enhanced optical absorption and photocurrent through a novel electron transport layer. The cell features a transparent conductive glass cathode, a titanium dioxide sensitized electron transport layer containing carboxy-chlorophyll derivative C-Chl, a perovskite layer of Cs2AgBiBr6, and a hole transport layer. The C-Chl sensitized TiO2 layer plays dual roles as an optical absorber and photocurrent generator, while the perovskite layer enables efficient charge transport.

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A lead-free perovskite solar cell with enhanced photovoltaic performance through surface passivation. The cell comprises a conductive substrate, a PEDOT: PSS layer, an inorganic lead-free CsSnI3 perovskite layer, a C60 layer, a BCP layer, and a metal counter electrode layer arranged in order from bottom to top. The CsSnI3 perovskite layer is passivated with a thioureas-based organic compound. The thioureas compound is specifically formulated to balance the stoichiometry of the CsSnI3 precursor, ensuring efficient perovskite formation while preventing surface defects. The PEDOT: PSS layer and C60 layer are deposited on the CsSnI3 layer, followed by the BCP layer and metal counter electrode layer. The thioureas compound is applied after the SnI2 precursor deposition but before the CsI deposition, ensuring optimal surface passivation. This approach enables the creation of high-performance lead-free perovskite solar cells with enhanced light absorption and stability.

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A method for improving the performance of perovskite quantum dot solar cells through the use of organic amine ligands. The method involves processing perovskite quantum dot light-absorbing layers with organic amine ligands during the synthesis process. The organic amine ligands enhance charge coupling between the perovskite quantum dots and the light-absorbing layer, while also promoting charge transport between the quantum dots. This approach enables the perovskite quantum dot solar cells to achieve higher short-circuit current densities and improved device performance compared to conventional methods.

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Quantum dot-enhanced nanowire array perovskite solar cells that achieve broader spectral absorption by incorporating quantum dots into the nanowire array structure. The nanowire array core is formed by vertically aligned nanowires with quantum dots distributed along their surface. The quantum dots are encapsulated in an organic-inorganic hybrid perovskite layer, which is then coated with a shell layer. The nanowire array is then connected to a second transport layer, creating a composite nanowire array structure with enhanced absorption capabilities.

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Perovskite quantum dot solar cells with improved efficiency and stability through the use of a novel ligand-free light absorption layer. The solar cells employ a perovskite quantum dot light absorption layer with a dielectric constant of 5-20, achieved through the post-processing of perovskite quantum dot films. This dielectric layer replaces conventional organic anti-solvents, enabling higher efficiency and reduced surface recombination through the elimination of surface defects. The solar cells achieve an efficiency of 14.96% under standard AM 1.5G conditions, with improved stability and performance compared to conventional perovskite solar cells.

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A perovskite quantum dot solar cell with enhanced stability through surface repair of the thin film. The cell employs a novel surface treatment approach using tetraacetic acid (TA) molecules, which replaces conventional organic ligands on the perovskite quantum dot surface. This treatment enables improved carrier mobility and reduced non-radiative recombination in the device, while maintaining the crystal structure of the perovskite material during thin film preparation. The treatment is achieved through spin coating of the TA solution onto the perovskite film before deposition of the electron and hole transport layers. The resulting device exhibits improved efficiency compared to conventional methods, with enhanced stability and carrier mobility.

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