Bromine doped methylamine lead iodide perovskite solar cell and manufacturing method thereof

Abstract

The invention belongs to the field of solar cells, in particular to an organic-inorganic hybrid perovskite solar cell. Bromine-doped methylamine-lead-iodide perovskite solar cell, the photosensitive layer of the solar cell is a bromine-doped methylamine-lead-iodide perovskite CH 3 NH 3 PB 3‑x Br x thin film, made from methylamine iodide CH 3 NH 3 I. Lead iodide PbI 2 After mixing, dissolve in N,N-dimethylformamide DMF and dimethyl sulfoxide DMSO mixed solvent to form CH 3 NH 3 PB 3 The perovskite precursor liquid is then made by spin-coating, cleaning process combined with multi-step atmosphere annealing process. in CH 3 NH 3 PB 3‑ x Br x In the film, the bromine content x has a value between 0.2 and 0.6. The invention also relates to a method for making the battery.

Description

technical field [0001] The invention belongs to the field of solar cells, in particular to an organic-inorganic hybrid perovskite solar cell. Its photosensitive layer is an organic-inorganic hybrid perovskite material with the chemical formula AMX 3 (A:CH 3 NH 3 + ; M: Pb 2+ ;X:I — 、Br — Halogen ions), AMX 3 The unit cell structure is a three-dimensional octahedron, NH 3 CH 3 + At the octahedral vertices, Pb 2+ At the body center, the halogen element ions are at the face center. Background technique [0002] A solar cell is a device that directly converts solar energy into electrical energy, and is the core component of solar photovoltaic power generation. At present, silicon-based solar cell technology is relatively mature, but there are problems such as high energy consumption, high cost, serious environmental pollution, and long cost recovery time in the production process, while perovskite solar cells have simple structure, easy processing, low cost, and can ...

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Problems solved by technology

In 2014, the Karunadasa team at Stanford University proposed a post-synthesis method to obtain MAPbBr 3 Thin film method, that utilizes bromine gas Br 2 (obtained by diluting saturated bromine gas 400 times with dry nitrogen gas) to MAPbI 3 Perovskite film treated for 8 minutes to obtain MAPbBr 3 Thin films, this method replaces iodide ions with bromide ions, and the reaction speed is fast, and it is not easy to achieve trace doping of bromine elements [Chem. Sci., 2015, 6, 4054]

The MAPb (I) prepared by the above-mentioned method 1−x Br x ) 3 The thin film also has the problem of reducing the short-circuit current and offsetting the open-circuit voltage to varying degrees, which limits the improvement of the photoelectric conversion efficiency of the battery

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