A process for using iodine lead formamidine as a light absorbing layer of a solar cell and an application thereof

Abstract

The invention discloses a process for using iodine lead formamidine as a light absorbing layer of a solar cell and an application thereof, wherein the light-absorbing layer of the solar cell is specifically perovskite containing iodine-lead formamidine component, and the preparation method comprises the following steps: (1) preparing a mesoporous structure; (2) preparing a precursor solution containing FAPbI3 iodolead formamidine perovskite: preparing raw materials including PbI2, FAI, CsI, etc. according to chemical dosage ratio, dissolving the raw materials in a solvent and then uniformly stirring to obtain a clear and transparent precursor solution; (3) putting the precursor into the mesoporous structure, standing, and then annealing in the solvent atmosphere to obtain the structure containing iodine lead formamidine. As a result of the anneal treatment assisted by the solvent vapor, the vapor assist of the solvent can slow down the crystallization while inhibiting the volatilization of iodoformamidine (FAI) and the like, so that the FAPbI3 can be stabilized in the black phase in the mesoporous film structure.

Description

technical field [0001] The invention belongs to the field of solar cells, more specifically, relates to a kind of iodine lead formamidine (FAPbI 3 ) as a process and application of solar cell light-absorbing layer. Background technique [0002] As a renewable clean energy, solar energy has been developed and utilized. Organic-inorganic hybrid perovskite materials are direct bandgap semiconductors, which have the characteristics of strong light absorption, high carrier mobility, adjustable bandgap, bipolar carrier conduction, and solution processing. ideal material. In just a few years, the performance of perovskite solar cells has developed rapidly, which has set off a research boom of researchers from all over the world. The laboratory notarized efficiency has exceeded 22.7%, surpassing the highest photoelectric conversion of polycrystalline silicon solar cells, which has been leading in the field of photovoltaics for many years. efficiency. [0003] MAPbI 3 (Eg=1.5eV,...

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Problems solved by technology

[0004] For the above defects or improvement needs of the prior art, the object of the present invention is to provide a process and its application using iodolead formamidine as a light-absorbing layer of a solar cell, wherein the structure containing iodolead formamidine inside the mesoporous The overall process design of the method, especially the control of the ambient atmosphere of the key annealing process, compared with the prior art, can effectively solve the problem that lead iodide formamidine cannot be effectively stabilized in the mesoporous structure with the black perovskite phase ( Especially the thicker mesoporous structure, such as thickness is the problem of 13 micron and above mesoporous structure), the present invention is by the annealing treatment under solvent vapor assistance, and the vapor assist of solvent suppresses iodoformamidine (FAI) etc. It can slow down the crystallization while volatilizing, which can make FAPbI 3 It is stabilized in the black phase in the mesoporous membrane structure; and, the Cs in the precursor solution + The introduction of FAPbI can further reduce 3 Activation energy for phase inversion, increasing FAPbI 3 Stability and lifespan of black phase

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