Important progress has been made in the study of organic photovoltaic mechanism

(a) Morphology and (b) Photophysical Path Diagram of Non-Fullerene Organic Solar Cell Blending Film Courtesy of Shandong University

Recently, Professor Gao Ke of the Scientific Research Center for Material Creation and Energy Conversion of Qingdao Research Institute of Frontier Interdisciplinary Sciences of Shandong University has made new progress in the study of molecular crystalline states and twin carrier pathways of organic photovoltaic cells, and the relevant research results have been published in the international academic journals “Advanced Materials” and “Macromolecular News”.

Organic photovoltaic cells (OPV) have the advantages of low cost, light weight, flexibility, large-area printing and preparation, and are one of the hot spots in the field of new energy research. Gao Ke studied the structural details and arrangement of non-fullerene receptor molecules in “single crystal-pure membrane-blend membrane”, found that the spontaneous carrier formation phenomenon was strong in non-fullerene receptor (NFA), and summarized the twin carrier pathway of organic thin film photovoltaic cells. The first pathway is the NFA phase autoluminescence carrier; the second pathway is the interface CT state dissociation exciton to produce carriers. The dual-channel mechanism is another important advantage in addition to the non-fullerene receptor light absorption and energy level advantages, which together contribute to the success of non-fullerene receptor materials in organic photovoltaic cells.

This work deeply explores the crystalline structure and self-assembly process of NFA molecules, and reveals the dual-channel carrier formation mechanism of non-fullerene organic photovoltaic cells. These results provide a new understanding of the structure of organic photovoltaic materials and the process of photoelectric conversion.

In addition, Gao Ke’s research group has made new progress in the study of low-cost “industrial-grade” fullerene while improving OPV efficiency and mechanical properties. This work provides a simple and economical new way of thinking for improving both the energy conversion efficiency and mechanical properties of the device, and provides a useful reference for the further development of flexible or stretchable organic solar cells.

The above work has been funded by the National Natural Science Foundation of China, the Natural Science Foundation of Shandong Province, the Basic Research Fund of Shandong University and other projects, and has been supported by many cooperative teams from Shanghai Jiao Tong University, City University of Hong Kong, Hong Kong University of Science and Technology, Tianjin University, Suzhou Institute of Nanotechnology and so on. (Source: China Science Daily Liao Yang Che Huiqing)

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