Ionic liquid sensibilized perovskite solar cell and preparation method thereof

Abstract

The invention discloses an ionic liquid sensibilized perovskite solar cell and a preparation method thereof. The ionic liquid sensibilized perovskite solar cell comprises an ITO substrate layer, a TiO2 compact layer on the ITO substrate layer, a mesoporous aluminum oxide layer on the TiO2 compact layer, an ionic liquid-perovskite composite layer on the aluminum oxide layer, and a carbon back electrode layer on the ionic liquid-perovskite composite layer. An ionic liquid is adopted for soaking a perovskite thin film, so that the crystallization degree of perovskite is improved, and the morphology defect of the perovskite is reduced, and therefore the separation and transmission conditions of electron holes at the heterojunction interface are improved, and the photoelectric conversion efficiency of a battery device is improved; a carbon back electrode is prepared through a spraying method; by virtue of the synergistic effect of the relatively small contact interface between the carbon black and the perovskite and the high conductive performance of carbon nano tubes, the filling factor and the photoelectric conversion efficiency of the battery are further improved; and the preparationprocess is simpler, thereby providing a novel method for commercial production of the large-area perovskite solar cell.

Description

technical field [0001] The invention relates to a perovskite solar cell preparation technology, in particular to an ionic liquid-sensitized perovskite solar cell and a preparation method thereof. Background technique [0002] With the increasing demand for energy, the reserves of traditional energy sources such as coal and fossil fuels are limited, and it is imminent to seek alternative new energy sources; solar energy, as a renewable and easy-to-use new energy source, has entered the People's vision, from this point of view, based on the photoelectric effect, the development of solar cells will become one of the best solutions for converting solar energy into electrical energy; in 2009, Miyasaka et al. used perovskite as a sensitizer for dye-sensitized solar cells , and use CH 3 NH 3 PbBr 3 Gained 3.2%, using CH 3 NH 3 PB 3 A photoelectric conversion efficiency of 3.8% was obtained; subsequently, Park et al. used CH 3 NH 3 PB 3 As a sensitizer for quantum dot-sensi...

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Problems solved by technology

[0003] Since the work function of carbon materials (-5.0ev) and Au's work function (-5.1eV) are very close, it is important to replace the noble metal Au with cheap and abundant carbon materials as the back electrode of perovskite solar cells. One of the very effective ways to reduce battery costs; however, the structure and properties of organic-inorganic hybrid perovskites are very sensitive to changes in solvents and temperatures, especially at high temperatures (>150°C), perovskites are easily decomposed and deteriorated , so it is very difficult to prepare a carbon back electrode directly on the organic-inorganic hybrid perovskite photosensitizer; at the same time, the perovskite active layer with different shapes will affect the performance of the battery, and the perovskite particles are too large to cause perovskite Pores are generated in the mineral film, which causes the open circuit voltage of the battery to drop, which in turn affects the performance of the device.

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