Design and Fabrication of Efficient Organic Solar Cells (PI: Prof. Henry He YAN) Organic semiconductors are important for various applications such as organic solar cells, transistors, and detectors. In 2014, Prof. Henry Yan discovered the Temperature-Dependent Aggregation behavior of certain polymeric donor materials, which led to the fabrication of high-performance organic solar cells for the first time. The group later achieved a record efficiency of 11.5% for single-junction organic solar, which was noted as a major technological breakthrough in NREL chart of “Best Research-Cell Efficiencies”. They continue to improve the design and efficiency of organic solar cell materials and devices, which have the advantage of being able to mass produce thin, flexible solar cell films for various applications. Metal Halide Nanocrystals for Energy Storage and Optical Emission (PI: Prof. Jonathan HALPERT) Semiconductor nanocrystals have unique properties compared to bulk materials. Their small size allows for tuning of the semiconductor band gap, which is important for their ability to emit light with tunable wavelengths. Prof. Jonathan Halpert has patents on semiconductor nanomaterials for display technologies and for energy storage. Lead-based perovskites are good for LEDs but contain toxic lead, so Prof. Halpert's group is using metal halides of copper and bismuth to produce efficient and non-toxic nanomaterials for energy storage and emission. Recently they have developed an inexpensive and lightweight photo-battery that can harvest and store solar energy in a single device. Research Strengths and Major Research Projects MATERIALS CHEMISTRY For details of respective research areas and projects, please visit our website. 13
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