Preparation and application of all-inorganic perovskite cell based on transition metal ion doping

Abstract

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.

Description

technical field [0001] The invention belongs to the field of new material technology and new energy technology, in particular to CsPbBr based on transition metal ion doping 3 All-inorganic perovskite solar cells and their preparation methods and applications. Background technique [0002] Solar energy is rich in resources, free to use, and does not require transportation, and has no pollution to the environment. It is the backbone of clean and renewable energy utilization. One of the most effective ways to utilize solar energy is to directly convert solar energy into electrical energy. In recent years, perovskite solar cells have become one of the most concerned photovoltaic devices due to their rapid development of photoelectric conversion efficiency from 3.8% to 23.7%. However, traditional organic-inorganic hybrid perovskite materials are easy to decompose in high temperature or humid air environment, resulting in poor device stability, which seriously hinders the commerc...

AI Technical Summary

Problems solved by technology

However, traditional organic-inorganic hybrid perovskite materials are easy to decompose in high temperature or humid air environment, resulting in poor device stability, which seriously hinders the commercial application of perovskite solar cells.

Perbromo-CsPbBr prepared by replacing organic ions with inorganic cesium ions 3 Perovskite overcomes the problem of poor stability in air and high temperature environments, but due to the large density of defect states in the perovskite film and the large interface energy difference with the carrier transport layer, the assembled battery is filled with defect states. The dominant non-radiative charge recombination and the serious bimolecular radiative charge recombination caused by space charge accumulation limit the further improvement of the photovoltaic performance of all-inorganic perovskite solar cells

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