Method for recovering lead iodide and substrate of waste perovskite device

Abstract

The invention provides a method for recovering lead iodide and a substrate of a waste perovskite device. The method comprises the following steps: preparing an iodide solution with a set concentration; the waste perovskite device is immersed in the iodide solution to be dissolved until perovskite minerals of the waste perovskite device are not dissolved any more, and supernate is taken; adding water into the supernate for dilution to obtain a lead iodide crystal containing a small amount of impurities; washing the lead iodide crystals with a small amount of impurities, adding acid to treat the lead iodide crystals, washing the lead iodide crystals with isopropanol and diethyl ether to obtain lead iodide powder, and drying the lead iodide powder to obtain recovered lead iodide; and the generated substrate is cleaned and recovered, and lead iodide is recovered by following the Lunschler principle, so that safe, green and low-cost recovery is realized.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a method for recycling lead iodide and substrates of discarded perovskite devices. Background technique [0002] Perovskite solar cells refer to a third-generation new type of solar cells that use organic-inorganic hybrid metal halide semiconductors as light-absorbing layers. Since the material was first used in solar cells in 2009, it has attracted extensive attention from many scientists and companies due to its low cost and high efficiency. In just over a decade, the certified photoelectric conversion efficiency of single-cell perovskite solar cells has exceeded 25.7%, which is comparable to that of crystalline silicon solar cells; at the same time, with its simple production equipment and process, perovskite solar cells have Great commercial application prospects. [0003] The recycling and reuse of solar cell materials can reduce environmental pollution, shorten the energy payba...

AI Technical Summary

Problems solved by technology

Therefore, the recycling and reuse of transparent conductive glass electrodes will greatly reduce production costs and shorten the energy repayment period; in addition, due to the large amount of lead ions in perovskite materials, they are highly toxic to the environment and human body, although in recent years Many effective strategies such as polymer encapsulation have been developed to prevent lead leakage in devices, but for recycled perovskite components, there is still a need for a low-cost, green, pollution-free and efficient recycling method. Effective approach to address lead toxicity in future commercialized perovskites

[0005]However, there are still only a handful of methods for recycling perovskite solar devices, and the reason is that there are too few solvents that can dissolve perovskite

Currently only a few solvents such as N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N-methylpyrrolidone (NMP), gammarine lactone (GBL) and ionic liquids can Dissolving perovskites, these solvents are highly toxic, expensive, flammable and explosive, and their efficiency in stripping perovskites from transparent conductive glass electrodes is not satisfactory; in addition, due to the The boiling point is relatively high, so generally in the recovery process, lead iodide is not easy to precipitate, so it needs a solid lead reaction to precipitate the lead ions in the recovery solution, so as to achieve the problem of repeated use of the recovery solvent. For example, Huang Jinsong's research group in 2021 "Nature Communication" reported the method of dismantling perovskite components with DMF first, and then using ion exchange resin to recover lead ions from the DMF recovery solution

[0006] According to the above, most of the current recycling processes rely on the above-mentioned organic solvents. It is not conducive to large-scale industrial use, so exploring new safe, green and low-cost perovskite recycling routes has great practical significance and application value

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