Mesoporous perovskite solar cell

Abstract

The invention discloses a mesoporous perovskite solar cell which comprises an FTO transparent conductive substrate, a compact layer, a mesoporous layer, an organic and inorganic metal halide perovskite layer, a hole transport layer and a metal counter electrode, wherein the compact layer, the mesoporous layer, the organic and inorganic metal halide perovskite layer, the hole transport layer and the metal counter electrode are sequentially stacked on the FTO transparent conductive substrate. The mesoporous layer is a multi-level structure titanium dioxide nano material converted by sintering a metal organic framework object. The adopted multi-level structure titanium dioxide nano material converted by sintering the metal organic framework object has large specific surface area and large particle size, can guarantee that perovskite completely permeates into the mesoporous layer, and guarantees sufficient and good contact of perovskite and titanium dioxide. The mesoporous perovskite solar cell adopting the multi-level structure titanium dioxide nano material as the mesoporous layer solves the problem that when universal small titanium dioxide nano particles serve as a mesoporous layer at present, perovskite cannot completely permeate into titanium dioxide, and accordingly photo-induced electrons cannot be sufficiently collected from a perovskite layer to a titanium dioxide layer, and battery efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a perovskite solar cell in which a multi-level structure titanium dioxide nanometer material converted from a metal organic framework is used as a mesoporous layer. Background technique [0002] The development of efficient and cheap solar cells is an effective means to solve the increasingly severe energy shortage and environmental pollution problems. Since 2012, in CH 3 NH 3 wxya 3 The representative metal organic halide perovskite solar cell has attracted much attention because of its cheap raw materials, simple preparation process, and high photoelectric conversion efficiency. , 1348-1349). At present, major breakthroughs have been made in the preparation and mechanism research of perovskite solar cells, showing attractive application prospects. [0003] Existing perovskite solar cell structures are generally divided into planar and mesoporous structures....

AI Technical Summary

Problems solved by technology

However, the mesoporous layer in the existing technology generally adopts smaller TiO2 nanoparticles (~20nm), and the fine gap between the nanoparticles prevents the perovskite from completely penetrating the TiO2 mesoporous layer, especially the mesoporous The bottom end of the layer is more difficult to infiltrate the perovskite

The resulting gap blocks the transmission path of some photogenerated electrons from the perovskite layer to the titanium dioxide layer, reducing the electron collection efficiency and resulting in low cell efficiency.

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