Hole transport layer modified based on 4-carboxyphenylhydrazine hydrochloride and perovskite solar cell

By using a method of co-self-assembling molecular layers of 4-carboxyphenylhydrazine hydrochloride and Ph-4PACz, the problems of charge transport degradation and interface defects caused by the agglomeration of carbazole phosphonic acid materials were solved, thereby improving the performance and stability of perovskite solar cells.

CN122121416BActive Publication Date: 2026-07-24HANGZHOU DIANZI UNIV
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Patent Information

Application Number
CN202610571666.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-04-28
Publication Date
2026-07-24
Estimated Expiration
2046-04-28

AI Technical Summary

Technical Problem

Carbazole phosphonic acid materials are prone to agglomeration during self-assembly, leading to deterioration of charge transport characteristics and interface defects, which affect the photoelectric conversion efficiency and stability of perovskite solar cells.

Method used

A co-self-assembled molecular layer was formed by combining 4-carboxyphenylhydrazine hydrochloride with Ph-4PACz, which suppressed π-π stacking and agglomeration, passivated perovskite buried interface defects, and optimized the surface coverage and charge transport of the molecular layer.

Benefits of technology

It significantly improves hole extraction and transport characteristics, reduces interfacial nonradiative recombination losses, and enhances the photoelectric conversion efficiency and long-term stability of perovskite solar cells.

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Abstract

This invention discloses a hole transport layer and a perovskite solar cell modified with 4-carboxyphenylhydrazine hydrochloride. A co-self-assembled monolayer is constructed by adding 0.05–0.20 mg / mL of 4-carboxyphenylhydrazine hydrochloride to a Ph-4PACz solution. The co-assembly behavior of 4-carboxyphenylhydrazine hydrochloride with Ph-4PACz inhibits the π-π stacking and aggregation of rigid conjugated groups, repairs long-range ordered charge transport channels within the molecular layer, and improves hole extraction and transport characteristics. Simultaneously, 4-carboxyphenylhydrazine hydrochloride can synergistically passivate uncoordinated Pb at the perovskite buried interface. 2+ Defects and deep-level Pb 0 This invention addresses defects, reduces interfacial nonradiative recombination losses, and improves the crystallinity quality of perovskite thin films. By simultaneously optimizing charge transport characteristics and interfacial passivation effects, it significantly improves the photoelectric conversion efficiency and device stability of perovskite solar cells, and also provides guidance for the manufacture of large-area perovskite solar cells.
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Citation Information

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