Perovskite type solar energy battery with quantum dot size performing gradient change and preparation method

Abstract

The invention discloses a perovskite type solar energy battery with a quantum dot size performing gradient change and a preparation method. The perovskite type solar energy battery consists of a transparent conductive substrate, a compact electronic transmission layer, a composite light-absorption layer and a metal electrode layer; the composite light-absorption layer consists of n layers of perovskite-wrapping P type semiconductor quantum dot core shell structures, the sizes of which can perform V type gradient changing. Because the light-absorption layer of the perovskite type solar energy battery adopts multiple layers of perovskite-wrapping P type semiconductor quantum point core shell structures with the quantum sizes performing V type gradient change, the invention can realize the fact that the composite material presents gradient distribution of the forbidden bandwidth on the vertical gradient through designing the quantum dot size V type form distribution, and expands the spectrum scope of the absorption layer. Besides, the invention can improve the interface electric field on the photocathode interface, promotes the separation of the photo-induced carrier under the electric field and improves the conversion efficiency of the photoelectron.

Description

technical field [0001] The invention relates to the field of photovoltaic materials, in particular to a perovskite solar cell with a gradient change in quantum dot size and a preparation method thereof. Background technique [0002] With the development of the economy and the progress of society, people put forward higher and higher requirements for energy, and finding new energy has become an urgent issue facing mankind. Among many renewable energy sources, solar energy is known as one of the most promising options due to its advantages of abundant reserves, environmental protection, and low price. It has gradually become an important part of human energy use and has been continuously developed. [0003] In 2009, Japanese scientists discovered a perovskite-type light absorber with a bandgap of only 1.5eV, which shows good application prospects in the photovoltaic field. Perovskite solar cells are named after perovskite as the absorbing layer. It is developed from dye-sensi...

AI Technical Summary

Problems solved by technology

This energy level difference at the conduction band edge is generated between the photoanode and the absorbing layer, which introduces the separation driving force of electrons and holes, but there is no separation potential energy between the photocathode and the metal electrode, and the electron holes are easy to move here. The recombination center, and the distribution is not uniform, resulting in uneven absorption of sunlight in different areas of the battery, which eventually leads to uneven battery efficiency

[0007] In summary, none of the existing quantum dot / perovskite composite solar cell technologies has designed a reasonable energy band change of the absorption layer from the perspective of energy band engineering, making full use of the wide absorption domain of quantum dots and calcium The common advantage of simple preparation of titanium ore to obtain high-efficiency batteries

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