7 results about "Exciton dissociation" patented technology

The invention discloses an application of diphenyl disulfide as an additive of an active layer of a photovoltaic cell and the photovoltaic cell, which comprises the step of adding a volatile solid additive diphenyl disulfide into the active layer to regulate and control the performance of the active layer. The solid additive is added in the acceptor film forming process, and acceptor molecule aggregation and crystallization behaviors are continuously regulated and controlled in the film forming process and the thermal annealing process. The introduction of diphenyl disulfide can synergistically optimize multi-stage crystallization kinetics, enhance H-aggregation and J-aggregation at the same time, promote the formation of a receptor fibrous polycrystalline structure, improve the carrier mobility, and effectively improve the exciton dissociation and charge transfer capabilities of the active layer. Based on the regulation and control, the organic photovoltaic device using the diphenyl disulfide as the additive realizes the significant improvement of photovoltaic performance, the energy conversion efficiency reaches 19%, a new development direction is provided for the design of a multifunctional solid additive and the accurate control of the form of an active layer in the future, and a powerful technical support is provided for organic photovoltaic industrialization in the future.

This invention discloses a solid additive material for photoelectric converters, its application, and its preparation. The solid additive material for photoelectric converters comprises compounds having the structure shown in the following formula: the structure of the photoelectric converter, from bottom to top, includes a transparent substrate, a transparent electrode layer, a hole transport layer, a photoactive layer, an electron transport layer, and a metal electrode layer; the material of the photoactive layer includes a donor material, an acceptor material, and the solid additive material for photoelectric converters. The solid additive material for photoelectric converters of this invention can effectively control the morphology of the active layer, thereby improving the performance of photovoltaic devices. After addition, the acceptor molecules in the active layer are arranged more compactly and orderly, thereby improving the internal carrier physics processes, enhancing exciton dissociation, improving charge transport, and reducing charge recombination, thus significantly increasing the short-circuit current density and fill factor of the photoelectric converter, and obtaining higher photoelectric conversion efficiency.

This invention belongs to the field of photocatalytic materials technology, specifically relating to a method and application of a one-step in-situ synthesis of a homo-heterojunction composite photocatalyst based on cyanophenylacetylene copper / phenylacetylene copper (CN-PhC₂Cu / PhC₂Cu). This invention achieves one-step in-situ synthesis of a homo-heterojunction composite photocatalyst with a tight interface structure under mild conditions by controlling the ratio of cyanophenylacetylene copper (CN-PhC₂Cu) to phenylacetylene copper (PhC₂Cu). This heterojunction effectively promotes exciton dissociation and photogenerated electron delocalization, significantly suppresses charge recombination, and improves visible light utilization efficiency. Experiments show that this composite photocatalyst exhibits excellent degradation performance for various water pollutants such as diclofenac (DCF) under visible light irradiation, possessing advantages such as high degradation efficiency, wide pH adaptability, and strong resistance to interference from coexisting ions. The method of this invention is simple and operates under mild conditions, providing new materials and technical support for efficient visible light-driven water pollution control.

The present application relates to the technical field of organic solar cell, and particularly relates to a four-arm small molecule compound and a preparation method and application thereof. The four-arm small molecule compound is prepared from benzene [1,2-b:4,5-b'] dithiophene-4,8-diyl bis (trifluoromethanesulfonate) as a starting material through Suzuki coupling reaction, acetalization protection reaction, Vilsmeier haack acylation reaction, deprotection reaction and Knoevenage condensation reaction. The four-arm compound material is added into an active layer as an additive to optimize the stacking behavior and reduce energy disorder. The present application realizes the synergistic control of nanoscale phase separation morphology and photophysical process through the four-arm small molecule compound, inhibits the excessive aggregation of polymers, promotes the formation of a double-continuous interpenetrating network of a donor-acceptor, balances the exciton dissociation and charge transport efficiency, and thus high-efficiency organic solar cells can be prepared.

This invention belongs to the field of organic solar cell technology, and particularly relates to a layered organic solar cell based on a bithiazole additive and its fabrication method. The active layer of this cell includes a D18 donor layer and an acceptor layer containing L8-BO and a bithiazole additive (DBB), wherein the additive is only present in the acceptor layer. A layer-by-layer spin-coating process is employed, and the morphology of the acceptor layer is controlled by solid-state additives to solve the solvent residue problem. This achieves synergistic optimization of the exciton dissociation interface and charge transport channels, resulting in a photoelectric conversion efficiency of 19.7% and significantly improved stability.

The invention discloses injectable near-infrared light response photoelectric nanoparticle hydrogel and a preparation method thereof, and belongs to the technical field of medical materials.The preparation method comprises the steps that a photoelectric nanoparticle aqueous dispersion containing a surfactant and an organic photoelectric semiconductor is added into a mixed solution of a NaOH aqueous solution and an HBSS solution, then rat tail collagen is added, the mixture is stirred to be uniform, and the injectable near-infrared light response photoelectric nanoparticle hydrogel is obtained. And then uniformly mixing with a PBS (Phosphate Buffer Solution) for crosslinking. By adjusting a donor-acceptor material system and a phase separation scale, the particles realize efficient exciton dissociation and photon-generated carrier generation in a brain tissue optical window (approximately equal to 850 nm). According to the invention, rat tail collagen is used as a biocompatible matrix, near-infrared response BHJ photoelectric nanoparticles are introduced into a gel forming process, and injectable photoelectric-collagen composite gel with fluidity, rapid gel forming and uniformly distributed photoelectric functions is constructed and can be used as a three-dimensional hydrogel material system with near-infrared light triggered electric response characteristics. And a material basis is provided for related biomedical engineering application.

The present application relates to the technical field of optoelectronic devices and organic semiconductor, in particular to a high bias-resistance single photosensitive material organic photodetector and a preparation method, and its technical key points are: using single-component organic thin film as single-component photosensitive unit, and connecting in series with light-light gain variable resistance unit; by using single-component photosensitive unit and light-light gain variable resistance unit in series structure, using the nonlinear impedance characteristics (high impedance in dark state, low impedance under illumination) of light-light gain variable resistance unit, the technical problems of traditional single-component organic photodetector, such as dark current surge under high bias and inability to withstand high reverse bias, are successfully solved, so that the dark current can still be maintained at 10 ‑7 A / cm² order of magnitude and not breakdown, while significantly improving the efficiency of exciton dissociation, achieving the highest external quantum efficiency of more than 55% and 10 12 Jones detectivity, with the effects of narrow-band spectral response and high sensitivity.