Non-fullerene acceptor materials based on thiophene derivative π bridge, preparation method and application thereof

By introducing thiophene derivative π-bridges into non-fullerene acceptor materials, the photoelectric conversion efficiency of existing thiophene π-bridge materials is enhanced through improved DA interaction and intermolecular stacking, thus achieving high-efficiency photoelectric conversion.

CN119684320BActive Publication Date: 2025-10-21SHANGHAI ZHUYANG NEW ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411636440.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-15
Publication Date
2025-10-21
Estimated Expiration
2044-11-15

AI Technical Summary

Technical Problem

The photoelectric conversion efficiency of existing thiophene π-bridged polymeric non-fullerene acceptor materials still lags behind that of small molecule acceptor materials. How to introduce a better π-bridge to improve photoelectric conversion efficiency is a technical problem that urgently needs to be solved.

Method used

Non-fullerene acceptor materials based on thiophene derivative π-bridges were used to enhance the DA interaction and improve the degree of conjugation by introducing thiophene derivative π-bridges. Intermolecular stacking was enhanced by intramolecular S…O and H…O non-covalent interactions. The materials were prepared by tinning and Stille coupling reactions.

Benefits of technology

The device achieved an improvement in photoelectric conversion efficiency, with device performance exceeding 18%, open-circuit voltage exceeding 0.92 volts, short-circuit current exceeding 25 mA/cm2, and fill factor exceeding 78%, demonstrating excellent film-forming properties and charge transport performance.

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Abstract

The application discloses a non-fullerene acceptor material based on a thiophene derivative pi bridge, a preparation method and application thereof. The non-fullerene acceptor material has a conjugated molecular knot with two or more than two pi-A-D-A type repeating units, and includes three types of molecular building blocks, namely, a thiophene derivative pi bridge, an aromatic ring core D with electron-donating properties, and a terminal unit A with electron-withdrawing properties. The application can flexibly construct an organic photovoltaic non-fullerene acceptor molecule by using the multi-selectivity and combination of the three types of molecular building blocks. The introduction of the thiophene derivative pi bridge is favorable for enhancing the D-A effect, improving the conjugation degree, and enhancing the intermolecular packing of the acceptor and improving the charge mobility. The non-fullerene acceptor material can be prepared by using a relatively common tin reaction and a Stille coupling reaction, has stronger electron-donating and electron-withdrawing effects, suitable molecular packing, and higher photovoltaic performance.
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