Organic solar cell with exciton blocking and solar photosensitizing integrated hole transport layer and preparation method thereof

Abstract

The invention discloses an organic solar cell with an integrated hole transport layer for exciton blocking and sunlight sensitization and a preparation method thereof. The device includes a substrate, a transparent electrode, a hole injection layer, an exciton blocking layer, Donor layer, acceptor layer, electron transport layer and electrode cathode. The device is characterized by an exciton blocking layer. Through material matching, this exciton blocking layer can not only effectively block electrons at the anode end, reduce the dark current component and electron leakage current of photovoltaic cells; The ultraviolet light emits pure blue or sky blue light, enhancing the number of incident photons to the active layer of the subsequent organic solar cell. The photogenerated current is increased to improve the power conversion efficiency of photovoltaic cells. The device disclosed by the invention simultaneously realizes the dual functions of exciton blocking and solar light enhancement in a simple method without other additional optical designs and complex processes. The preparation process is simple, the equipment requirement is low, and it is suitable for mass production.

Description

technical field [0001] The invention relates to an organic optoelectronic device and a preparation method thereof, in particular to an organic solar cell (OPV) and a preparation method thereof, which are applied in the technical field of green solar energy. Background technique [0002] Organic optoelectronic technology is one of the high-tech technologies that have developed rapidly in the world's academic circles in the past 10 years. With the rapid development of film-forming technology and the diversity of design of organic materials or organic / inorganic hybrid materials, organic optoelectronic products such as organic electroluminescence devices, organic solar cells (organic photovoltaic cells, OPV), organic field effect transistors, etc. are gradually developing. Mature, and has the advantages of easy large-area preparation, flexibility, and shock resistance. Among them, organic solar cells using clean energy have attracted much attention in the field of energy techno...

AI Technical Summary

Problems solved by technology

[0005] 2. The donor / acceptor exciton separation in traditional planar heterojunction cells is not sufficient, resulting in low short-circuit current;

[0006] 3. The morphology and structure of the bulk heterojunction are complex, it is difficult to control accurately, and there are many unknown mechanisms;

[0007] 4. The mismatch between the injection and transport rates of holes and electrons leads to the limitation of the final photogenerated current

[0008] The traditional hole injection or transport material in OPV is poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), which has an excellent smooth conductive substrate, suppresses leakage current and obtains a higher open circuit voltage, but at the same time It is also a strong exciton quencher, which affects the promotion of OPV in real-world applications

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