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The Photovoltaic Research Department of the Korea Energy Research Institute, in collaboration with the KIER Energy Artificial Intelligence and Computational Science Laboratory, has made progress in improving the
The Photovoltaic Research Department of the Korea Energy Research Institute, in collaboration with the KIER Energy Artificial Intelligence and Computational Science Laboratory, has made progress in improving the durability and performance of translucent perovskite solar cells. It is promising to use these elements in window construction and in the development of tandem solar cells.
Translucent solar cells achieved a record efficiency of 21.68%, making them the most efficient perovskite solar cells with transparent electrodes in the world. In addition, they demonstrated exceptional durability, with more than 99% of initial efficiency maintained after 240 hours of operation.
The key to achieving carbon neutrality by 2050 is to overcome limitations in installation locations and national land area by achieving the “ultra-high efficiency” and “application diversity” of next-generation solar cell technology. This requires efficient and multifunctional technologies such as tandem solar panels and solar panels for windows. Both technologies require highly efficient and stable translucent perovskite solar cells.
To make translucent perovskite solar cells, it is necessary to replace the metal electrodes of ordinary opaque solar cells with transparent electrodes that transmit light. During this process, high-energy particles are produced, which degrades the performance of the hole transport layer.
To prevent this, it is customary to place a metal oxide layer that acts as a buffer between the hole transport layer and the transparent electrode layer. However, compared to opaque solar cells produced under the same conditions, the charge transfer properties and stability of translucent devices have decreased, and the reasons and solutions for this have not been fully elucidated.
Researchers used electro-optical analysis and computational science at the atomic level to identify the reasons for the reduced charge-carrying properties and stability that occur during the production of translucent perovskite solar cells. In this way, they found that lithium (Li) ions added to increase the electrical conductivity of the hole transport layer diffuse into the metal oxide layer that acts as a buffer, ultimately changing the electronic structure of the metal oxide buffer layer for degradation. features.
Moreover, in addition to identifying the cause, the researchers solved the problem by optimizing the oxidation time of the hole transport layer. They found that converting lithium ions into stable lithium oxide (LixOy) through optimized oxidation alleviates the diffusion of lithium ions, thereby increasing the stability of the device. This discovery suggests that lithium oxide, previously thought to be a simple byproduct of the reaction, may play a critical role in improving efficiency and stability.
The developed process resulted in perovskite solar cells with an impressive efficiency of 21.68%, the highest among all perovskite solar cells with transparent electrodes. In addition, this study showed that it retained an impressive 99% of its initial power for over 400 hours in darkness and over 240 hours under continuous light, demonstrating its outstanding effectiveness and stability.
The research team went further and applied the developed solar cells as the top cell of the tandem solar cells, creating the country’s first double-sided tandem solar cells that use light reflected from the back surface as well as the front surface. Jusung Engineering Co., Ltd. In collaboration with. and Germany’s Jülich Research Center, double-sided tandem solar cells provide energy efficiency of 31.5% for quadrupole configurations and 26.4% for bipolar configurations under conditions where back-reflected light is 20% of standard sunlight. achieved high binary equivalent efficiency.
The leader of the study is Dr. from the Photovoltaic Research Department. An Sejin said: “This research is a significant advance in this field, examining the degradation process that occurs at the interface between the organic compound and the metal oxide buffer layer, which is specific to perovskite solar cells” and added: “Our solution is easy to implement and has great potential for future use of the technologies we have developed.” shows.”
Source: Port Altele
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