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Recently, the team led by Professor Chen Yongsheng of the School of Chemistry at Nankai University has made breakthroughs in the research of organic solar cells. They used a complementary light-absorbing strategy of oligomers to construct a stacked organic solar cell device with broad spectral absorption characteristics, achieving a photoelectric conversion efficiency of 12.7%. It is understood that this is also the highest record for the photoelectric conversion efficiency of organic/polymer solar cells reported in the current literature.
According to reports, organic solar cells are one of the effective ways to solve environmental pollution and energy crisis problems. They are far superior to traditional solar cells in terms of low cost, high flexibility, simple process, and environmental friendliness. However, since the first organic solar cell device was born in 1958, how to improve the photoelectric conversion efficiency has always plagued scientists from all over the world. This issue also directly determines whether organic solar cells can get out of the laboratory and into human life.
“As an emerging frontier research field, in recent years, due to the design and development of photoactive layer materials and the continuous optimization of device structures, the energy conversion efficiency of organic solar cells has increased substantially.†Chen Yongsheng said that he and his team have been working for many years. In-depth systematic research on organic photovoltaic device material screening and construction processes was conducted, and a series of solution-processable, high-efficiency oligomer-type molecular active layer materials were developed. In 2015, more than 10% of photoelectric conversion efficiency was achieved.
Considering industrialization requirements, the use of active materials with different spectral absorption ranges for the preparation of stacked photovoltaic devices is an effective strategy for further improving the photoelectric conversion efficiency. Based on this idea, Prof. Chen Yongsheng teamed up with the research team of South China University of Technology to prepare high-efficiency organic solar devices using solution processing methods compatible with industrial production. After process optimization, 12.7% verification efficiency was finally achieved.
According to relevant design principles, through the further optimization of materials and devices, there is room for further improvement in photoelectric conversion efficiency, which is expected to reach 15% or more. "Next, we will mainly solve the problem of battery life, and further increase the efficiency of energy conversion. We believe that the dream of organic solar cells from the laboratory to the actual application and the realization of commercial production will become a reality in the near future," said Chen Yongsheng. (Economic Daily reporter Nguyen Nguyen)
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