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Development of large area, organic solar cell printing technology

Development of large area, organic solar cell printing technology

tech innovation 2022

(left) High-efficiency, high-stability, organic solar modules incorporating ternary photoactive layers. (Right) Demonstration of a high-efficiency, high-stability, organic solar module incorporating ternary photoactive layers. Credits: Korea Institute of Science and Technology (KIST)

Solar cell technology is a major clean energy source. In particular, organic solar cells, part of the third generation of solar cells, are gaining attention as a core technology for urban solar beam energy generation because they can be printed and used on exterior walls or glass windows of buildings. can be imposed on. However, the photoactive region that absorbs sunlight and converts it into electricity remains much smaller than 0.1 cm². Additionally, commercialization is hindered by the performance and reproducibility problems that occur when expanding the cell area to several square meters.2 Where practical energy supply levels are available.

of the Center for Advanced Photovoltaics Research at the Korea Institute of Science and Technology (KIST; President: Seok-Jin Eun). A research team led by Hee Jung Son discovered the factors of performance degradation in large-area organic solar cells and announced the development of a new polymer additive material for large-area, organic solar cell technology development.

The research team focused on the structural form and solution process of the photoactive layer in organic solar cells, which is a part of the organic solar cell manufacturing process. The spin coating method, a solution process primarily used in the laboratory research phase, creates a uniform photoactive layer mixture as the solvent rapidly evaporates while the substrate rotates at high speed. However, the large-area, continuous solution process designed for industrial use caused a degradation in the performance of the solar cell because the solvent evaporation rate of the solar cell material solution was too slow. As a result, unwanted aggregations can be formed between photoactive materials.

Organic solar modules with high efficiency, high stability. Credits: Korea Institute of Science and Technology (KIST)

The research team has developed a polymer additive that can prevent this phenomenon by interacting with composite prone materials. As a result, ternary photoactive layers containing polymer additives were fabricated to prevent aggregation in the photoactive layers. Additionally, due to the potential nano-scale structure control, improved solar cell performance and stability protection against light-induced temperature rise during operation of the solar cell are achieved. A 14.7% module efficiency was achieved, resulting in a 23.5% performance increase compared to conventional binary systems. Efficiency and stability were demonstrated by simultaneously maintaining an initial efficiency of over 84% for 1,000 hours, even in an 85 ℃ hot environment.

KIST’s Dr. Son stated that they “have moved closer to organic solar cell commercialization by proposing a core principle of solar cell materials capable of processing high quality, large area solutions,” further expressing that “through follow-up research, It will be commercialized to enable environmentally friendly self-sustaining energy generation that is easily applicable to exterior building walls and automobiles, and can also be used as an energy source for mobile and IoT devices.”

research was published in nano energy,


Development of photovoltaics that can be applied like paint in real life


more information:
Sungmin Park et al, The important role of alloy polymer acceptors for high efficiency and stable large-area organic photovoltaics, nano energy (2022). DOI: 10.1016/j.nanoen.2022.107187

Provided by National Council of Science and Technology Research

Citation: Development of Large Area, Organic Solar Cell Printing Technology (2022, 21 June) Retrieved 21 June 2022

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