217results about How to "Improve photovoltaic performance" patented technology

Organic photosensitive optoelectronic devices are disclosed. The devises comprise photoconductive organic thin films in a heterostructure, which include an exciton blocking layer to enhance device efficiency. The use of fullerenes in the electron conducting layer has lead to devices with high efficiency. Single heterostructure, stacked and wave-guide type embodiments are disclosed. Devices having multilayer structures and an exciton blocking layer are also disclosed. Guidelines for selection of exciton blocking layers are provided.

The present invention provides method of treating semiconductor surfaces (e.g., CIGS) using various solvents (including ionic solvents and eutectics), and methods preparing photovoltaic cells comprising treated CIGS materials.

Organic photosensitive optoelectronic devices are disclosed. The devises are thin-film crystalline organic optoelectronic devices capable of generating a voltage when exposed to light, and prepared by a method including the steps of: depositing a first organic layer over a first electrode; depositing a second organic layer over the first organic layer; depositing a confining layer over the second organic layer to form a stack; annealing the stack; and finally depositing a second electrode over the second organic layer.

The present invention provides a maximum power point tracking method and device and a photovoltaic power generation system. The maximum power point tracking method comprises: sampling present voltage and present current of a photovoltaic array; obtaining present power based on the present voltage and the present current; using difference between the present power and power for previous sampling time as present perturbation power, and based on ratio of the present perturbation power to perturbation power for previous sampling time, obtaining gradient perturbation voltage step ratio; obtaining perturbation voltage step based on the gradient perturbation voltage step ratio and voltage difference between the present voltage and the voltage for previous sampling time; and controlling output voltage based on the perturbation voltage step.

Compositions, synthesis and applications for benzene, furan, thiophene, selenophene, pyrole, pyran, pyridine, oxazole, thiazole and imidazole derivatized anthra[2,3-b:6,7-b′]dithiophene (ADT) based polymers, namely, poly{5,11-bis(5-(2-ethylhexyl)thiophen-2-yl)anthra[2,3-b:6,7-b′]dithiophene-2,8-diyl-alt-2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one-4,6-diyl}, poly{5,11-bis(5-(2-ethylhexyl)furan-2-yl)anthra[2,3-b:6,7-b′]dithiophene-2,8-diyl-alt-2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one-4,6-diyl and poly{5,11-bis(5-(2-ethylhexyl)selenophen-2-yl)anthra[2,3-b:6,7-b′]dithiophene-2,8-diyl-alt-2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one-4,6-diyl} are disclosed. Further, an organic solar cell constructed of a derivatized anthra[2,3-b:6,7-b′]dithiophene (ADT) based polymer is discussed.

This invention is related to novel perylene diester derivatives represented by the general formula (I) or general formula (II) as described herein. The derivatives are useful in various applications, such as luminescent dyes for optical light collection systems, fluorescence-based solar collectors, fluorescence-activated displays, and/or single-molecule spectroscopy. The invention also relates to a luminescent medium, such as a luminescent film, that can significantly enhance the solar harvesting efficiency of thin film CdS/CdTe or CIGS solar cells. The luminescent medium comprises an optically transparent polymer matrix and at least one luminescent dye that comprises a perylene diester derivative. Over 16% of an efficiency enhancement to a CdS/CdTe solar cell and over 12% of an efficiency enhancement to a CIGS solar cell can be achieved.

The invention relates to a method for preparing a BiFeO3 ferroelectric thin film photovoltaic battery on a glass substrate, comprising the following steps of: selecting glass as a substrate; preparing a BiFeO3 ferroelectric thin film with a perovskite structure through a chemical solution deposition method; and preparing a top electrode with a size of 0.5*0.5 mm on the thin film through a physical sputtering method. Compared with the prior art, the method disclosed by the invention can be used for preparing the BiFeO3 ferroelectric and photovoltaic thin film with a perovskite structure, which has the advantages of high consistency and good repeatability on the glass substrate, by a low cost. The prepared thin film has the advantages of excellent photovoltaic property and single-directional conductive property of a diode. The BiFeO3 ferroelectric thin film can be applicable to the fields of a photovoltaic battery and an optical electronic device due to the excellent properties.

The invention provides a TiO2 nanotube array photoanode and a preparation method thereof. The photoanode is characterized by electrodepositing a silver film on the surface of the TiO2 nanotube array of the photoanode, wherein the microscopic surface topography of the silver film is randomly distributed dendrites; the primary dendrites are 6-15mu m long; the secondary dendrites are 600nm-3mu m long; and the space between the secondary dendrites is 100-300nm. The silver modified TiO2 nanotube array photoanode is obtained by reasonably controlling the concentration, electrodeposition temperature, deposition potential and deposition time of the silver nitrate electrolyte. The silver is used as the noble metal instead of gold and electrodeposition is used instead of the electron beam lithography technology to prepare the silver nanoparticle-TiO2 nanotube array structure as the solar cell photoanode, thus lowering the cost and shortening the preparation period. The short-circuit current density and open-circuit voltage of the silver nanoparticle-TiO2 nanotube array photoanode after being modified by the metal are greatly improved compared with the short-circuit current density and open-circuit voltage of the silver nanoparticle-TiO2 nanotube array photoanode before being modified by the metal.

The invention relates to a preparation method of a solar battery with a bismuth ferrite/sodium bismuth titanate-barium titanate heterostructure ferroelectric film. The preparation method comprises the following steps of: selecting SnO2 transparent conducting glass doped with fluorine (FTO for short) as a substrate, preparing the (Na0.5Bi0.5)0.94Ba0.06TiO3 and BiFeO3 ferroelectric film by a chemical solution deposition method, then preparing an electrode on the surface of the film by a physical sputtering method. Compared with the prior art, the preparation method has the advantages that the ferroelectric photoelectric film with high consistency and good repeatability is prepared on the FTO substrate by low cost. The prepared heterostructure film has more excellent photovoltaic performance than that of the pure BiFeO3, and can be applied in the fields of photoelectric batteries and photoelectronic devices.

The present invention provides an all-inorganic perovskite solar cell based on transition metal ions doped CsPbBr<3> and a preparation method and an application thereof. Specifically, the invention isthat conductive glass is first spin-coated with an electron transfer layer and subsequently spin-coated with a lead bromide solution mixed with transition metal ions, then is spin-coated with a cesium bromide solution repeatedly; the non-porous perovskite film with a high crystallinity and a large grain size is prepared; and finally the all-inorganic perovskite solar cell based on transition metal ions doped CsPbBr<3> is assembled by blade coating of carbon back electrode. The invention reduces the defect density in the perovskite film by doping transition metal ions, simultaneously the energy band structure is adjusted; the energy loss of charge migration is reduced; and the separation, extraction and transfer of photogenerated charges and charge recombination are reduced, thereby the photoelectric conversion efficiency and long-term operation stability of the cell are improved. The invention has the advantages such as simple and feasible preparation method, large optimization spaceof material combination, no noble metal back electrode or hole transporting layer and low cost.

A solid-state hole transport composite material (ssHTM) is provided made from a p-type organic semiconductor and a dopant material serving as a source for either sodium (Na+) or potassium (K+) ions. The p-type organic semiconductor may be molecular (a collection of discrete molecules, that are either chemically identical or different), oligomeric, polymeric materials, or combinations thereof. In one aspect, the p-type organic semiconductor is 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (Spiro-OMeTAD). The dopant material is an inorganic or organic material salt. A solid-state dye-sensitized solar cell (ssDSC) with the above-described ssHTM, is also provided.

The invention discloses a two-dimensional conjugated dibenzothiophene compound as well as a preparation method and application thereof. Specifically, the compound has a general structural formula shown as formula I in the description; in formula I, R1 is linear or branched alkyl of C6-C12; R2 is linear or branched alkyl sulphanyl or linear or branched alkoxy of C6-C12; R3 is linear or branched alkyl sulphanyl or linear or branched alkoxy of a hydrogen atom and C6-C12. The compound provided by the invention has a relatively wide visible region absorption range and proper energy levels, and can be utilized for preparation of a solar cell, and the energy conversion efficiency of the prepared solar cell exceeds 8%, so that the photovoltaic property of the compound is excellent; besides, the compound can be utilized for preparation of a high-quality thin film according to a solution processing method, and can be easier to purify than a polymer material, so that an electron-rich donor material of which the purity is very high can be prepared by utilizing the compound.

The invention discloses a high-efficiency ternary organic solar cell which comprises a substrate, a cathode, a cathode modification layer, an active layer, an anode modification layer and an anode. The active layer includes a blend film of a polymer electron donor PBDB-T and two types of micro-molecular electron acceptors HF-PCIC and IEICO-4F. The morphology of the active layer is optimized via complementary absorption of the PBDB-T, HF-PCIC and IEICO-4F, especially IEICO-4F. The prepared ternary organic solar cell realizes excellent photoelectric response in the wide spectrum range of 300-1000nm, and compared with a binary organic solar cell based on PBDB-T:HF-PCIC, the short-circuit current density is improved by 7.2MA/cm2, and the highest power conversion efficiency PCE reaches 11.2% which is 8.82% higher than that of the binary cell. In addition, the ternary organic solar cell has a very low energy loss (0.59eV), so that the cell has a higher open-circuit voltage.