During his PhD studies, Yi Ouyang investigated how the electronic properties of 2D materials can be engineered to enhance the performance of optoelectronic devices. These atomically thin materials exhibit unique optical and electronic characteristics, ideal for applications such as light detection, solar energy harvesting, and future integrated circuits. Yi Ouyang focused on the rational design and modulation of energy band alignment at material interfaces to reduce electrical resistance, improve charge carrier separation, and enable multifunctional device functionalities.

These new insights contribute to the advancement of next-generation, energy-efficient 2D optoelectronic systems.

The PhD study was completed at Department of Biological and Chemical Engineering, Aarhus University.

This summary was prepared by the PhD student.

Time: Friday, 12 September 2025 at 13:00
Place: Building 3130, room 303, Department of Biological and Chemical Engineering, Aarhus University, Gustav Wieds Vej 10C, 8000 Aarhus
Title of PhD thesis: Rational Design of Band Alignment for Advanced 2D Optoelectronic Systems
Contact information: Yi Ouyang, e-mail: au716078@uni.au.dk, tel.: +45 91957016
Members of the assessment committee:
Professor Sohini Kar-Narayan, Department of Materials Science & Metallurgy, University of Cambridge, England
Professor Zhipei Sun, Department of Electronics and Nanoengineering, Aalto University, Finland
Associate Professor Bekir Engin Eser (chair), Department of Biological and Chemical Engineering, Aarhus University, Denmark
Main supervisor: Professor Zheng Guo, Department of Biological and Chemical Engineering, Aarhus University, Denmark
Co-supervisor: Professor Mingdong Dong, Interdisciplinary Nanoscience Center, Aarhus University, Denmark
Language: The PhD dissertation will be defended in English

The defence is public.
The PhD thesis is available for reading at the Graduate School of Technical Sciences/GSTS, Ny Munkegade 120, building 1521, 8000 Aarhus C.