2023 Outstanding Master Student Award － TAN Yuejie（Yamada-Miyajima Laboratory）－

My research focuses on CsPbBr₃ solar cells for photovoltaic power converters in optical wireless power transmission and 4-terminal tandem solar cells.

Currently, numerous challenges and risks exist in energy crises. To solve the crisis, it is important to employ higher power generation technology. The development of clean energy, particularly photovoltaic energy generation systems, holds immense promise.

On the other hand, advancements in mobile equipment such as submarines and outer space satellites have enabled humans to expand their investigative reach to previously unexplored regions. For these applications, it is of low continuity and reliability if we only rely on stored energy within the machines. To address this issue, stable wireless power transmission technology can be an excellent solution. In both stable photovoltaic power generation systems and optical wireless power transmission (OWPT) systems, solar cells play a crucial role. Among the different types of solar cells, perovskite solar cell is currently the most heated topic due to their rapid progress, cost-effectiveness, and high efficiency. In my investigation, I focus on the all-inorganic perovskite CsPbBr₃ solar cell.

CsPbBr₃ solar cells possess several advantages as the inorganic perovskite solar cell, including a wide bandgap and inherent stability. It is suitable for two different application fields: OWPT and 4-terminal (4-T) tandem solar cells. By harnessing the capabilities of CsPbBr₃ solar cells, the developed OWPT will revolutionize how we access and use electrical power. Additionally, CsPbBr₃ solar cells can be integrated as the top cell for 4-T solar cells, which has the potential to achieve super high efficiency and stable photovoltaic power generation.

In my master thesis, we investigated the performance of the CsPbBr₃ solar cell by using device simulation to clarify the criteria to obtain high efficiency photovoltaic power converter for blue light. It was found that the conduction band offset between the electron transport layer (ETL) and the CsPbBr₃ layer has a large impact on the conversion efficiency.

I am so honored to receive the award this year. I would like to express my heartfelt gratitude to my Professor, Miyajima sensei, who has shown unwavering dedication to my training and work. Without his guidance, I would not understand the essence of being a researcher. I want to sincerely thank my parents and family for their unwavering support, love, and kindness. Their encouragement empowers me to navigate life with pride and courage. In challenging times, their love and companionship provided me solace. Thank them for granting me the opportunity to explore this vast world.

As a member of the Yamada-Miyajima lab, I always gain invaluable knowledge in solar cell development. The future of utilizing clean energy in society is incredibly appealing, I would love to endeavor and continue this work in my PhD time. I firmly believe that where there is a dream, there is a journey. I also wish that there is always a future beyond our physical bodies, an eternal dream calling out our names. For this reason, every obstacle we have overcome holds profound meaning.