Organic solar cell active layer with dicyan imidazole derivative as additive, and preparation method and use thereof

By introducing the dicyanimidazole derivative PBhDCI as an additive into organic solar cells, a non-covalent cross-linked network was constructed, which solved the problem of insufficient thermal stability of organic solar cells and achieved a synergistic improvement in photoelectric conversion efficiency and thermal stability.

CN122161329BActive Publication Date: 2026-07-21SICHUAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN UNIV
Filing Date
2026-05-06
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing organic solar cells have insufficient thermal stability. In particular, under thermal stress, the donor and acceptor phase regions are prone to molecular diffusion-driven phase separation and excessive crystallization of components, leading to irreversible degradation of device performance.

Method used

Using dicyanimidazole derivative PBhDCI as an additive, a non-covalently interacting cross-linked network is constructed at the interface between electron donor and electron acceptor materials. The physical cross-linked structure is formed by hydrogen bonding and dipole-dipole interactions, which inhibits thermally activated molecule diffusion and phase coarsening.

Benefits of technology

The photoelectric conversion efficiency and thermal stability of organic solar cells were improved, with the photoelectric conversion efficiency reaching 19.7%, the short-circuit current density increasing to 29.8 mA·cm-2, and the fill factor reaching 77.9%. After continuous thermal aging at 85°C in nitrogen for 50 hours, the photoelectric conversion efficiency retention rate exceeded 83%, which is much higher than that of the control group.

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Abstract

The application belongs to the technical field of organic optoelectronic devices, and discloses an active layer of an organic solar cell with a dicyan imidazole derivative as an additive, a preparation method and application thereof. The active layer of the organic solar cell with the dicyan imidazole derivative as the additive comprises: an electron donor material, the molecular structure of the electron donor material comprising a thiophene ring and / or an ester carbonyl; an electron acceptor material, the molecular structure of the electron acceptor material comprising a terminal cyano group; and a dicyan imidazole derivative additive PBhDCI, the PBhDCI being distributed at the interface of the electron donor material and the electron acceptor material and constructing an interface crosslinking network through non-covalent interaction. The application introduces the dicyan imidazole derivative PBhDCI with a twisted V-shaped configuration as an additive, constructs a non-covalent crosslinking network at the interface of the electron donor material and the electron acceptor material, and significantly improves the comprehensive performance of the organic solar cell.
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