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07/16/2020 HYU News > Academics


Professor Ko Min-jae's Joint Research Team Has Developed the New Perovskite Quantum Dot Solar Battery

Perovskite quantum dot solar battery efficiency increased from 13.4% to 14.1%

Global News Team

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Hanyang University's Department of Chemical Engineering Professor Ko Min-jae's team announced on July 14 that together with DGIST Department of Energy Convergence Research Center's Professor Kim Young-hoon they have developed the New Perovskite Quantum Dot Solar Battery. This technology also holds light energy electroluminescence characteristics and is expected to contribute to the commercialization of optical technologies such as building-integrated solar energy generation, multi-functional photoelectric devices, and Li-Fi.
Quantum dots have great light-absorbing capacities and are one of the key elements of next-generation solar batteries, which absorb light from large areas. The perovskite quantum dot solar battery has the ability to transfer light into electric energy and electricity into light, and is known to have the highest efficiency in the quantum dot solar battery field.
In order to synthesize superior perovskite quantum dots, organic ligands, which have a long hydrocarbon chain, are used. Ligands adhere to small perovskite quantum dots of 10 nanometers (nm) on the surface and allow them to disperse in diverse nonpolar solvents.
When these quantum dots are well-arranged on boards, quantum dot solar batteries are created. Here, as a long-chain ligand adheres to a quantum dot’s surface, it makes the charge transfer difficult between quantum dots, a process which degenerates solar battery functions and where transfering it to the ligand chain where hydrocarbon is required.
The research team focused on the hydrophobicity (not easily combine with water molecules) of benzene group-based phenethylammonium (PEA) ligands. They then succeeded in applying this safely to the perovskite quantum dot's surface. Through this, they improved the efficiency of transforming solar energy into electric power to 14.1% and additionally tried to keep high photovoltaic efficiency stability of over 90% for 15 days in an environment with relative humidity of 20~25%, which is similar to external environments.

Doctor Kim Young-hoon said that “we investigated and have discovered for the first time that by applying a ligand which holds both a short hydrocarbon chain and hydrophobicity, that both a quantum dot solar battery’s performance and safety can be improved at the same time,” and that “this will provide a new paradigm for developing and commercializing a next generation quantum solar battery”.
In this research, Hanyang University's Department of Chemical Engineering's master’s and doctorate program student Kim Ji-gun and the DGIST Department of Energy Convergence Research Center's post-doc participated as the lead author and was published online in Nano Energy, a world-class journal in the energy science field, on June 15.
A performance and safety evaluation of a perovskite quantum dot solar battery with a short hydrophobicity ligand. (photo by: DGIST)

Global News Team
Translation by: Park Gyeong-min
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