Ferroelectric material modified composite perovskite solar cell and preparation method thereof

Abstract

The invention discloses a ferroelectric material modified composite perovskite solar cell and a preparation method thereof, and belongs to the technical field of solar cell processing, the ferroelectric material modified composite perovskite solar cell comprises a transparent conductive substrate, and the transparent conductive substrate is sequentially provided with a hole transport layer, a perovskite light absorption layer, an electron transport layer and an electrode layer from inside to outside; wherein the perovskite light absorption layer comprises a perovskite light absorption layer body, a ferroelectric layer is deposited at the contact part of the perovskite light absorption layer body and the hole transport layer, the ferroelectric layer is composed of a plurality of ferroelectric nanocrystals, and the ferroelectric layer is subjected to field passivation in ferroelectric polarization; on one hand, field passivation can be carried out on a perovskite pin junction through ferroelectric polarization, and the photoelectric conversion efficiency of the perovskite cell is improved; on the other hand, different from direct insertion of the ferroelectric functional layer, direct contact between the perovskite light absorption layer and the hole transport layer is not affected, and hole extraction of the hole transport layer is not affected.

Description

technical field [0001] The invention belongs to the technical field of solar cell processing, and particularly relates to a ferroelectric material-modified composite perovskite solar cell and a preparation method thereof. Background technique [0002] Perovskite solar cells have excellent optoelectronic properties due to their tunable band gap, high light absorption coefficient, long carrier lifetime and diffusion length, high defect tolerance, and low-cost low-temperature liquid phase preparation methods. received widespread attention. The efficiency of its small-area laboratory-fabricated photovoltaic devices has soared from 3.8% in 2009 to 25.8% in 2021 in just over a dozen years, and is considered a strong contender for next-generation novel photovoltaic materials. [0003] Upright structure planar heterostructure (nip-type) perovskite cells have always been a research hotspot in the field of perovskite photovoltaics due to their simple fabrication process and high phot...

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Problems solved by technology

[0005] At present, the starting point for the preparation of mainstream high-efficiency inverted structure perovskite cells is to optimize and modify the functional layers of the cells themselves, which has high requirements for the purity of materials and preparation processes, and the improvement of perovskite cells through field passivation However, few people have studied the solution of efficiency. In addition, although the field passivation of perovskite can be achieved by adding a functional layer between the perovskite and the electron / hole transport layer, the functional layer itself does not satisfy the calcium The energy band matching between titanium and the charge transport layer will inhibit the extraction of electrons / holes in the perovskite to a certain extent, thereby affecting the efficiency of the perovskite battery.

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