Higher efficiency through pulsed light

A team of researchers recently made progress in the production of so-called quantum dot solar cells. These could further advance the energy transition.

Solar panels continue to play a crucial role in the energy transition. However, available systems often only achieve an efficiency of around 20 percent. It is therefore hardly surprising that scientists and companies around the world continue to search for better materials for the systems.

A research team recently developed a novel method to improve the electrical conductivity of PbS quantum dot solar cells. This technique uses pulsed light that regularly generates large amounts of energy and significantly increases efficiency. These are nanoscale semiconductor materials that scientists are currently researching in the development of next-generation solar cells.

Research team improves manufacturing process of quantum dot solar cells

PbS quantum dots can absorb a wide spectrum of sunlight and have low manufacturing costs due to their processing and photoelectric properties. Traditionally, the heat treatment process of PbS quantum dots requires considerable time and high temperatures to improve conductivity.

However, light, heat and moisture accelerate the formation of defects on the surface of the quantum dots, which can affect the performance of the devices. A team led by Professor Jongmin Choi proposed a heat treatment in which the team exposed the quantum dots to light for a few milliseconds to suppress defects and extend the lifetime of the charges.

The proposed pulsed heat treatment technique uses strong light to complete the process in a few milliseconds. This suppresses surface defects and extends the lifetime of the charges that generate electric current. This method achieves high efficiency and overcomes the shortcomings of the existing methods.

Results could produce even better solar systems

This development could facilitate the production and commercialization of PbS quantum dot solar cells. The technique offers a significant advance for the application of quantum dot technology in PV devices. The research was supported by the National Research Foundation of Korea and other projects.

Professor Choi stresses that this technology has the potential to be applied to various optoelectronic devices, which could greatly expand efficiency and application possibilities. The method represents an important step in improving the efficiency of solar cells and could help reduce dependence on fossil fuels and promote the use of renewable energy.

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