Small Molecule Organic Photovoltaic Cells

Optoelectronic material for organic solar cells that enhances photoelectric conversion efficiency through a novel donor material. The material, comprising a specific organic compound with a benzodione backbone, achieves high efficiency in organic solar cells by providing a precise balance of electron and hole transport properties. The compound's unique molecular structure enables optimized energy level matching between donor and acceptor materials, resulting in improved device performance.

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High-efficiency ternary quasi-planar heterojunction organic solar cells with improved stability and performance compared to prior ternary cells. The cells have a composite active layer containing a donor polymer (PBDB-TF) and two acceptor polymers (BTP-BO-4Cl and BTP-BO) that are phase-separated. The acceptors have different terminal functional groups to enhance binding. An additive (1,8-diiodooctane) is added to the acceptor composite to improve light absorption and hole mobility. The phase separation and additive help prevent agglomeration and stabilize the cell.

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Organic photovoltaic cells with improved efficiency through the design of low-cost, high-performance active layer materials. The invention introduces a novel molecular structure where a branched alkyl group replaces the traditional fused structure in the central unit of organic photovoltaic materials. This non-fused design enables the creation of photovoltaic materials with enhanced light-harvesting capabilities while maintaining low-cost synthesis. The branched structure enables efficient electron transfer and charge separation, leading to improved photovoltaic efficiency. The resulting materials can be used to prepare high-performance organic solar cells with improved light absorption and conversion efficiency.

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High-efficiency quaternary organic solar cell with vertical phase separation in the active layer for improved charge extraction. The cell uses a blend of four materials - wide bandgap polymer donor PM6 and three non-fullerene acceptors L8-B0, BTP-S8, and BTP-S2. The specific choice of materials allows complementary absorption and controlled morphology to optimize charge collection. The cell structure is anode/modification layer/PM6:(L8-B0, BTP-S8, BTP-S2)/cathode modification layer/cathode.

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Organic solar cell with improved efficiency and preparation method. The cell structure has a sequential arrangement of conductive base, buffer layers, and active layer containing electron donor PM6 and non-fullerene acceptor N3, without fullerene. The active layer also contains a small amount of bis(pentafluorophenyl)zinc. This composition and order of materials in the active layer improves the conversion efficiency of organic solar cells. The cell is prepared by coating the layers in sequence on a conductive substrate, annealing after each layer, and adding the top electrode.

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A non-toxic additive for organic solar cells that improves device efficiency by enhancing the morphology and crystallinity of the active layer. The additive is a hydroxy pyrimidine derivative called ROPD. It has a general formula with a hydroxyl group. This additive is blended with the donor and acceptor materials in the active layer solvent. The hydrogen bonding between ROPD and the donor improves the morphology, crystallinity, carrier dissociation, and transport in the active layer.

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A novel bulk material for organic solar cells that combines electron acceptor and donor functionalities through intramolecular hydrogen bonding and dipole interactions. The material comprises a conjugated backbone with an electron acceptor unit and an electron donor unit, which form a supramolecular conjugated system. This structure enables the formation of a self-assembled active layer through hydrogen bonding and dipole interactions, leading to improved light absorption and charge transport properties. The material can be used as an additive in organic solar cells to enhance energy conversion efficiency and stability.

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A single-bond coupled electron acceptor material for organic solar cells that achieves enhanced photoelectric conversion efficiency through a novel structural design. The material comprises a core with an electron-donating unit and two terminal units that are coupled through a single bond, forming an electron-withdrawing unit (A) - electron-donating unit (D) - electron-withdrawing unit (A) structure. This design eliminates the photoisomerization issues associated with traditional electron acceptor structures while maintaining high photoelectric conversion efficiency.

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Organic solar cell that can be used for in a wide range of applications, including non-fullerene organic solar cells (NF-OSCs) to obtain higher energy conversion efficiency. The cell comprises an anode which is arranged on the surface of the anode in a laminated mode, and an organic solar cell that is prepared using the quinacridone derivative or the nitrogen-doped quinacridone derivative as a cathode interface material.

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Non-fused middle-band gap electron acceptor material for organic solar cells, comprising a donor material and a non-fused middle-band gap acceptor material with a molecular structure of A-DA'-DA. The non-fused middle-band gap acceptor material exhibits a unique electronic structure that enables efficient charge separation in organic solar cells, while the donor material enhances the material's overall photovoltaic performance.

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Organic photovoltaic materials with improved efficiency through the use of benzopyrazine-based donor cores. The materials incorporate benzopyrazine donor units connected to planar acceptor molecules, which enable enhanced charge transport and reduced recombination losses compared to conventional fullerene-based acceptors. The donor units are prepared through a novel chemical reaction pathway that enables precise control over molecular structure and planarity. The resulting materials exhibit improved photovoltaic performance, including enhanced open-circuit voltage and power conversion efficiency, while maintaining good crystallinity and solution processability.

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Organic donor photovoltaic materials with improved efficiency through the substitution of chlorine atoms in silyl groups. The materials exhibit enhanced light absorption and electron transport properties, enabling higher conversion efficiencies in organic solar cells. The synthesis involves a two-step process involving the formation of a phosphonium salt intermediate, followed by a coupling reaction with tetrakis(4,4'-bipyridine)phosphonium chloride.

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Organic semiconductor compound and solar cell with enhanced electron acceptor properties. The compound has a long exciton diffusion distance, enabling efficient electron-hole separation even in organic solar cells with double-layer structures. The compound's unique absorption and emission spectra allow it to act as an effective electron acceptor in organic solar cells, while maintaining high efficiency. The compound's Stoke's shift is within the range of 30-50 nm, which is critical for achieving optimal electron-hole separation in organic solar cells.

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Organic solar cells based on benzodithiazole near-infrared receptors achieve high open-circuit voltages through the use of near-infrared responsive electron acceptors with low HOMO energy levels. The novel electron acceptors incorporate thiophene [3,4-b]thiophene with a dilute effect between the indenylidene (IDT) and end of the cyanindanone, enabling extended absorption beyond 1000 nm. This approach addresses the limitations of conventional organic solar cells by reducing the electron acceptor's HOMO energy level, resulting in improved open-circuit voltage values.

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Organic solar cell active layer comprising an N-phenylalkylamide derivative additive and a preparation method thereof. The active layer comprises a donor polymer and an electron acceptor polymer blended in an organic solvent, and the solvent is then dissolved with the additives in a mixed solution. The mixed solution is then spin-coated onto the anode buffer layer to form the active layer.

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Organic small molecule photovoltaic material with a benzodithiophene donor core, featuring a precise molecular weight and reduced synthesis batch variability. The material comprises a dithiophene benzodithiophene donor core, which provides a high power conversion efficiency through its unique electronic structure. The material's molecular weight and purity are maintained through controlled reaction conditions, resulting in a consistent performance across batch runs. This material can be used as a donor in organic photovoltaic devices, particularly in applications requiring precise molecular weight control.

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A method for preparing high-efficiency organic solar cells with improved charge transport properties. The method involves preparing a substrate with a surface roughness below 1 nm, followed by nitrogen plasma cleaning. The cathode buffer layer is then prepared through spin coating and thermal annealing, followed by photoactive layer deposition. The anode buffer layer is then evaporated, and metal deposition completes the solar cell structure. This approach addresses the limitations of conventional star-shaped small molecule solar cells by enhancing charge transport through improved surface interactions and microphase separation.

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High-efficiency organic solar cells with improved stability and efficiency through the use of a novel amphiphilic small molecule additive in the photoactive layer. The additive enhances phase separation control, microscopic film crystal size uniformity, and receptor molecule orientation in the active layer, leading to enhanced device performance. The method involves surface cleaning, thermal annealing of the cathode buffer layer, photoactive layer preparation, vapor deposition of the anode buffer layer, and metal anode deposition.

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A quinoxaline derivative receptor material for organic photovoltaic cells with reduced electron-hole recombination. The material, represented by formula I, incorporates a sialoxane-based donor structure that enables efficient electron transfer through a novel quinoxaline-based acceptor. This combination provides high photovoltaic efficiency while minimizing electron-hole recombination, enabling the production of high-performance organic photovoltaic devices with reduced optical losses.

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A novel organic photovoltaic material with improved performance in organic solar cells. The material comprises a thienoisobenzopyran-based donor unit connected to a 5,6-bisfluorobenzothiadiazole acceptor unit. The donor unit achieves high short-circuit current density through its low HOMO energy level and strong absorption spectrum in the visible to near-infrared range. The donor unit is incorporated into a solution-processed bulk heterojunction solar cell with PC71BM as the acceptor material, resulting in enhanced energy conversion efficiency and improved device stability.

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