Energy level alignment is a research area in the field of physics and materials science that focuses on understanding the alignment of energy levels at the interface of materials in order to improve the efficiency of electronic devices. This alignment plays a crucial role in determining the flow of charge carriers and can influence the performance of devices such as solar cells, light-emitting diodes, and transistors. Researchers in this area study the mechanisms and factors that govern energy level alignment at interfaces, as well as the techniques and strategies for controlling and optimizing it for specific applications. Ultimately, a better understanding of energy level alignment can lead to the development of more efficient and sustainable electronic devices.