Double-sided inorganic perovskite solar cell and its preparation method and application

Abstract

The invention provides a double-sided inorganic perovskite solar cell doped with alkali metal ions and alkaline earth metal ions and a preparation method and application thereof. An electron transportmaterial is deposited on FTO conductive glass, and then a precursor solution of the perovskite light absorbing material doped with the alkali metal ions and the alkaline earth metal ions is continuously spin-coated so as to form a perovskite light absorbing layer with excellent performance. Finally a carbon electrode is coated in a blading way, and two symmetrical inorganic CsPbBr3 perovskite solar cell devices are closely combined by the same carbon electrode through vacuum treatment so as to manufacture the double-sided inorganic CsPbBr3 perovskite solar cell. The crystal size of perovskiteis reduced, the band gap is reduced and the photoelectric conversion efficiency and stability of the cell are improved by the kinds and the proportion of the doped alkali metal and alkaline earth metal ions so as to have the advantages of simple preparation method, no hole transport layer, large improvement space of material and technology and the like.

Description

technical field [0001] The invention belongs to the field of new material technology and new energy technology, and specifically relates to a double-sided inorganic perovskite solar cell and its preparation method and application. Background technique [0002] Perovskite solar cells are a new class of thin-film solar cells developed in recent years based on solid-state dye-sensitized solar cells. The working principle of perovskite solar cells is: [0003] (1) When the incident sunlight irradiates the perovskite layer through the photoanode, the valence band electrons in the perovskite layer absorb photon energy and jump to the conduction band, leaving holes in the valence band; [0004] (2) Electrons are injected into the conduction band of the electron transport layer and further transported to the external circuit; while holes are extracted by the hole transport layer to realize the separation of electron-hole pairs. [0005] Although the photoelectric conversion effici...

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Problems solved by technology

Inorganic CsPbBr 3 The preparation of all-inorganic perovskite solar cells with light-absorbing materials greatly improves the stability of the device, but there are still two problems: first, due to the complete coverage of the opaque carbon electrode, the device can only absorb solar energy from the front; second, The energy level barrier existing between the carrier transport layer / perovskite layer interface causes severe carrier recombination inside the battery

The above two problems are not conducive to the further improvement of the efficiency of this type of solar cell. Therefore, it is of great theoretical significance and practical value to develop a double-sided inorganic perovskite solar cell doped with alkali metal and alkaline earth metal ions with a simple preparation method.

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