Asymmetric cyanomethylidene indan-1-one acceptor material and preparation and application methods thereof

Abstract

The invention belongs to the fields of organic solar cells and particularly relates to an asymmetric cyanomethylidene indan-1-one acceptor material and preparation and application methods thereof. Theacceptor-donor-acceptor (A-D-A) type cyanomethylidene indan-1-one acceptor materials in an asymmetric structure is obtained by introducing asymmetric donor units; by properly reducing the conjugatedlength of the donor units, the electron donating property of the donor units can be weakened to properly reduce the highest occupied molecular orbital (HOMO) of the donor units, so that an appropriatelevel structure can be acquired; when blended with the three common polymer donor materials of PTB7-Th, PBDB-T and FTAZ, the asymmetric cyanomethylidene indan-1-one acceptor can achieve good energy level matching to obtain high exciton dissocation and charge transfer, ensure good performance of solar battery devices and further enlarge the application range of non-fullerene acceptors.

Description

technical field [0001] The invention belongs to the field of organic solar cells, and in particular relates to an asymmetric cyanomethylene indone acceptor material and its preparation method and application. Background technique [0002] Organic solar cells (OSCs) are a new type of solar cells with the advantages of flexibility, light weight, low cost, and large-area processing. In 1986, Tang first prepared a double-layer heterojunction organic solar cell with a photoelectric conversion efficiency of 1%. In 1995, Heeger introduced the bulk heterojunction (BHJ) structure into organic solar cells, and the performance was greatly improved compared with the double-layer heterojunction. The BHJ structure is obtained by blending electron donors and electron acceptors, and the electron acceptors have mainly used fullerene derivatives (PC 61 BM, PC 71 BM) because of its high electron mobility, isotropic charge transport, and suitable phase separation from the donor material. At...

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Problems solved by technology

However, the disadvantages of fullerene derivatives, such as high synthesis cost, weak absorption in the visible light range, and difficulty in adjusting the energy level, limit their further development. Compared with fullerene derivatives, ene acceptors have the advantages of strong absorption in the visible light range, easy adjustment of energy levels, and easy synthesis and purification. Gradually replacing fullerene derivatives has become the main acceptor material in organic solar cells.

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