Perovskite solar cell and preparation method for same

Abstract

The invention discloses a perovskite solar cell and a preparation method for the same. The perovskite solar cell sequentially comprises a conductive substrate, a hole transport layer, a perovskite layer, an electron transport layer, a cathode modification layer and a metal cathode from bottom to top, wherein the cathode modification layer comprises a conjugate polymer of which side chains contain at least two hydroxyl groups; the conjugate polymer comprises a conjugate main chain, the conjugate main chain comprises conjugate units A and B which are connected with each other, each of the conjugate units A and B comprises fluorene, dibenzothiophene, thianaphthene, BT, DBT or a phenyl group, the conjugate units A and B are connected with different side chains in which one side chain contains 2 to 6 hydroxyl groups. According to the perovskite solar cell and the preparation method for the same, an interface dipole modification effect is achieved by virtue of polar groups, so that the potential barrier between the metal cathode and the electron transport layer is reduced, the interface recombination effect is alleviated, and the performance of the perovskite solar cell is improved.

Description

technical field [0001] The invention relates to a perovskite solar cell and a preparation method thereof, belonging to the technical field of fuel cells. Background technique [0002] The compound with calcium titanate crystal structure is called perovskite crystal, with CH 3 NH 3 PB 3 The representative perovskite material is widely used as the active layer of solar cells. Compared with organic semiconductor materials, it has the characteristics of wide absorption spectrum and high absorption coefficient. It also has good bipolar charge mobility and a diffusion length much higher than that of organic semiconductor materials. Organic semiconductor materials (about 10nm). At present, the efficiency of perovskite solar cells has reached the application requirements, but its stability is the key to its practical application. [0003] At present, most n-i-p structure perovskite devices have photocurrent hysteresis, and p-i-n structure devices using fullerene materials as ele...

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Problems solved by technology

[0003] At present, most n-i-p structure perovskite devices have photocurrent hysteresis, and p-i-n structure devices using fullerene materials as electron transport layers can effectively reduce photocurrent hysteresis, but fullerene materials and metal electrodes Fermi energy The level is not completely matched, and, in general, the efficiency of p-i-n type perovskite solar cells is generally lower than that of n-i-p type perovskite solar cells, generally by inserting a cathode modification layer to promote electron transport and protect fullerene electron transport Floor

[0004] For example, the 201510035430 patent uses LiF as the cathode modification layer. LiF needs to use thermal evaporation technology, which is expensive, and LiF is an insulator in nature, and its thickness is often less than 2nm, so there are certain restrictions on its use.

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