A perovskite photodetector for accelerated electron filtering

Abstract

The invention discloses a perovskite photodetector for accelerated electron filtering, which comprises a substrate, an anode, an active layer and a composite cathode, wherein a hole transport layer, an active layer and a composite cathode are arranged between the anode and the active layer An electron filter layer is arranged between the electrodes. The present invention adopts the perovskite material with excellent characteristics such as high mobility, small exciton binding energy, long exciton lifetime and long exciton diffusion distance as the active layer of the photodetector device, which greatly reduces the cost of the device. The loss of internal thermal excitons; at the same time, a new type of electron filter layer is creatively proposed, which can effectively transport electrons to the cathode for collection, while greatly reducing the recombination probability of excitons and the quenching effect of electrodes on excitons; the obtained Perovskite photodetectors have high external quantum efficiency and spectral responsivity, and their performance has been significantly improved.

Description

technical field [0001] The invention belongs to the field of organic optoelectronics, relates to a novel photodetector, in particular to a perovskite photodetector with a high-efficiency filtering electronic structure. Background technique [0002] Organic photodetection devices have attracted extensive research interest due to their advantages such as low fabrication cost, wide range of material sources, light weight, flexibility, and easy integration with other optoelectronic devices. A large number of studies have proved that organic photodetectors have very broad application prospects in industry, agriculture and social life. In recent years, although the relevant scientific research has made great progress, the performance of the device has been greatly improved, but limited by some defects of the organic material itself and some problems in the structure design of the existing device, the performance of the device Ascension progress is slower. Therefore, the developm...

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Problems solved by technology

[0003] In terms of materials, conventional organic materials have some shortcomings: low carrier mobility, short exciton lifetime, short exciton diffusion distance, wide band gap, etc.

Because, although the electron transport layer material has high mobility, its exciton blocking ability is poor, and excitons are easily wasted through the layer through radiation and non-radiation complex forms and various quenching mechanisms; Although the barrier layer material has good exciton blocking function, its electron mobility is poor, which has a negative effect on electron transport.

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