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Monolithic III-V/Si
multi-junction solar cells
Monolithic III-V/Si
multi-junction solar cells
National Research Foundation
(나노소재기술개발사업)
Recently, tandem solar cells such as perovskite/Si structures are drawing strong attention in the photo-voltaic community. Direct epitaxy of III-V materials on Si is another promising approach for highly stable, scalable, and efficient Si-based multi-junction solar cells. However, challenges lie in overcoming epitaxial dislocations and residual thermal strain generated by lattice constant and thermal expansion coefficient mismatches, respectively. In this project, we aim to demonstrate highly reliable, scalable, efficiency greater than 30% III-V/Si triple-junction solar cells in collaborations with KANC, UNIST, and KOPTI.
Graphene/Quantum Dot for mixed-dimensional optoelectronic devices
Graphene/Quantum Dot for mixed-dimensional optoelectronic devices
National Research Foundation
(우수신진과제)
Integration of 2D materials and 0D QD is a promising route to improved material functionalities. Underlying the improved properties are alterations in carrier dynamics in such mixed-dimensional heterostructures. In this project, we aim to explore novel functions between QD and graphene due to their strong interactions such as a carrier redistribution and supply channels. We find that the PL enhancements up to 13 times from the graphene/InAs QD heterostructure is possible at room temperatures where devices operate. This finding advances the understanding of 2D graphene/0D QD heterostructures and can aid the design of mixed-dimensional future optoelectronic devices.
Quantum dot laser for silicon photonics integration
Quantum dot laser for silicon photonics integration
Monolithic integration of III-V quantum dot lasers onto Si substrate is a scalable and reliable approach for obtaining highly efficient light sources for Si photonics. Recently, a combination of optimized GaAs buffers and QD gain materials resulted in monolithically integrated butt-coupled lasers on Si. In the lab, we put continuous efforts to realize high performance 1.3 micron QD lasers integrated onto various III-V/Si platforms for seamlessly coupled silicon photonics.
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