Development of technology for large area printing, organic solar cell

(left) a highly efficient, highly stable organic solar module incorporating ternary photoactive layers. (right) Performance of the highly efficient, highly stable organic solar module, including triple photoactive layers. Credit: Korean Institute of Science and Technology (KIST)

Solar cell technology is a known source of clean energy. In particular, organic solar cells, part of the third generation of solar cells, are attracting attention as the main technology for generating energy from solar rays in urban conditions, as they can be printed and applied on exterior walls or glass windows of buildings. However, the photoactive zone, which absorbs sunlight and converts it into electricity, remains significantly less than 0.1 cm3. In addition, commercialization is hampered by problems with productivity and reproducibility, which arise when expanding the cell area to several meters2 where practical levels of energy supply are available.

A research team led by Dr. Hae Jung Son of the Advanced Center for Photovoltaics Research at the Korean Institute of Science and Technology (KIST; President: Seok-Jin Yoon) identified the factors causing the deterioration in the performance of large-area organic solar cells. announced that the development of a new material with a polymer additive for the development of technologies for organic solar cells with a large area.

The research team focuses on the compositional shape of the photoactive layer in organic solar cells and the dissolution process that is part of the organic solar cell production process. The centrifugation method, a solution process used mainly in the laboratory research phase, creates a homogeneous mixture of photoactive layer as the solvent evaporates rapidly while the substrate rotates at high speed. However, the continuous process with a large area, intended for industrial use, caused a deterioration in the productivity of solar cells, as the rate of evaporation of the solar cell solution was too slow. Therefore, undesirable aggregation between photoactive materials may occur.

Development of technology for large area printing, organic solar cell

highly efficient, highly stable organic solar module. Credit: Korean Institute of Science and Technology (KIST)

The research team has developed a polymer additive that can prevent this phenomenon by interacting with materials prone to aggregation. As a result, triple photoactive layers containing polymer additives were produced to prevent aggregation in the photoactive layers. In addition, thanks to the possible control of the nano-level structure, improvements in the performance of solar cells and security of stability are gained against the increase in temperature caused by light during the operation of the solar cell. The efficiency of the module of 14.7% was achieved, which led to a 23.5% increase in performance compared to that of the conventional binary system. Efficiency and stability were simultaneously demonstrated by maintaining over 84% initial efficiency for 1000 hours, even in a heated environment up to 85 ℃.

Dr Son of KIST said that they “have come close to the commercialization of organic solar cells by proposing the basic principle of a solar cell material capable of high-quality treatment of large area solutions”, adding that “commercialization through Subsequent research will make environmentally friendly self-sufficient energy possible, which is easily applicable to the exterior walls of buildings and cars, as well as an energy source for mobile and IoT devices. “

The study was published in Nano energy.


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More info:
Sungmin Park et al, An important role of the alloy polymer acceptor for high efficiency and stable organic photovoltaics with a large area, Nano energy (2022). DOI: 10.1016 / j.nanoen.2022.107187

Provided by the National Research Council for Science and Technology

Quote: Development of technology for printing with organic solar cells on a large area (2022, June 21), extracted on June 21, 2022 from https://techxplore.com/news/2022-06-large-area-solar- cell-technology.html

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