A hole transport material and a preparation method thereof

CN122103068APending Publication Date: 2026-05-29ZHEJIANG AIKO SOLAR ENERGY TECH CO LTD
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Patent Information

Application Number
CN202411657596.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-19
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In existing perovskite solar cells, Spiro-OMeTAD, as the hole transport layer material, has low mobility and is easily volatilized, which affects long-term stability. Furthermore, the introduced ion dopants are easily volatilized under light or heat, leading to accelerated ion migration and affecting cell stability.

Method used

By introducing ring-opening cross-linkable epoxy groups at the end of Spiro-OMeTAD, a cross-linked network structure is formed, which prevents water, oxygen and other substances from entering the hole transport layer, inhibits ion migration, and forms a high-density cross-linked network structure through the ring-opening reaction of multiple epoxy groups, thereby improving hole transport efficiency and battery stability.

Benefits of technology

It improves hole transport efficiency, suppresses ion migration, enhances the long-term stability of perovskite solar cells, and avoids material decomposition and volatilization of ion dopants.

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Abstract

The application is suitable for the technical field of solar cells, and provides a hole transport material and a preparation method thereof. An epoxy group capable of ring-opening cross-linking is introduced at the end of Spiro-OMeTAD, the epoxy groups at the end of Spiro-OMeTAD are ring-opening cross-linked to form a cross-linked network structure. On the one hand, the cross-linked network structure has the molecular orbital energy level of Spiro-OMeTAD, the highest occupied molecular orbital energy level thereof is aligned with the valence band energy level of a perovskite layer, is conducive to efficient extraction of holes generated by the perovskite layer, and effectively realizes photoelectric conversion. On the other hand, the cross-linked network structure not only blocks water, oxygen and the like from entering the inside of the hole transport layer, but also inhibits volatilization of an introduced ionic dopant, ensures the hole transport efficiency, prevents the transmission of ions in an active layer to the hole transport layer, and inhibits the ion migration of the hole transport layer. The application effectively inhibits ion migration while improving the hole transport efficiency, and improves the long-term stability of a perovskite solar cell.
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