57results about How to "Increase LUMO level" patented technology

An organic electroluminescence device including at least an anode, an emitting layer, an electron-transporting region and a cathode in sequential order, wherein the emitting layer contains a host and a dopant which gives fluorescent emission of which the main peak wavelength is 550 nm or less; the affinity Ad of the dopant is equal to or larger than the affinity Ah of the host; the triplet energy ETd of the dopant is larger than the triplet energy ETh of the host; and a blocking layer is provided within the electron-transporting region such that it is adjacent to the emitting layer, and the triplet energy ETb of the blocking layer is larger than ETh.

The invention discloses a three-body fullerene derivative and its preparation method and application, which include a benzene-substituted methylene fullerene hydrophobic group, a benzene with an electron-withdrawing group connected through a flexible spacer group Vinyl cyanide, and a flexible functional group trisubstituted by benzene ring; does not form large-scale aggregation, and has excellent thermal stability. The active layer prepared by the fullerene derivatives of the present invention can not only form a long-range ordered fiber structure for the donor, but also effectively crystallize the acceptor, and finally obtain an ideal microstructure with nanoscale phase separation and double continuous transport channels; triplet The fullerene itself introduces an electron-withdrawing group, which improves the LUMO energy level and is beneficial to the improvement of the open circuit voltage of the device; the combination of the two advantages greatly improves the photoelectric conversion efficiency of the solar cell and simplifies the preparation of the device. At the same time, thermally stable active layer and device performance can be obtained, eliminating the risk of easy oxidation and degradation of the device in post-processing.

The invention provides an electron injection material, a preparation method and an application, which are suitable for the technical field of solar energy. The electron injection material comprises cesium salt and zinc oxide which are mutually doped, wherein the mass ratio of the zinc oxide to the cesium salt is (1-6):1. According to the electron injection material, disclosed by the invention, the cesium salt and the zinc oxide are doped, thus the LUMO (Lowest Unoccupied Molecular Orbital) energy level of an electron injection layer is improved, the potential barriers of the electron injection material and an active layer are reduced, and the electron injection efficiency is largely increased. The preparation method disclosed by the invention has the advantages of simpleness for operation and low device requirements, and is suitable for industrial application.

The invention discloses a high-efficiency organic solar cell based on poly(3-hexylthiophene), which comprises a substrate, a cathode, a cathode modification layer, an active layer, an anode modification layer and an anode, wherein the active layer is an electron donor and A blend film of electron acceptor, the electron donor is poly(3‑hexylthiophene) (P3HT), and the electron acceptor is the non-fullerene acceptor DFPCBR. Utilizing the large π-conjugated system and strong electron-donating properties of the central unit, DFPCBR has high HOMO energy levels and LUMO energy levels, which form a good match with the energy levels of P3HT, suppressing energy loss, and making solar cells have higher open circuit voltage. At the same time, the intramolecular charge transfer (ICT) of DFPCBR is enhanced, which narrows the band gap and broadens the absorption spectrum. Therefore, the organic solar cell prepared by the invention obtains a relatively high power conversion efficiency (PCE), the highest being 5.34%. At the same time, the organic solar cell prepared by the invention can still maintain a high PCE even when the active layer is relatively thick, which is beneficial to future practical applications.