University of Cambridge > Talks.cam > Semiconductor Physics Group Seminars > Quantum Dot Growth Technology by MBE for Advanced Photovoltaics

Quantum Dot Growth Technology by MBE for Advanced Photovoltaics

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Teri Bartlett.

The talk is one of the seven talks scheduled for the “University of Cambridge ā€“ The University of Tokyo Joint Workshop on Quantum Nanostructures”, at 14:00-17:00. Significant effort and a rapid progress have been made today in modeling the device physics as well as practical demonstration of quantum dot intermediate band solar cells (QD-IBSCs). Presently, demonstration of QD-IBSCs is undergoing various development stages. The first challenge is to establish methods to fabricate high-density QDs arrays or superlattice of low defect density and long carrier lifetimes. The strain-compensated or strain-balanced growth technique by MBE can significantly improve the QDs quality and characteristics of solar cells even after stacking of > QD 100 layers in self-organized heteroepitaxy. The second effort is to increase the carrier lifetimes in IB states by controlling the recombination rates such as by using (1) a type-II QD heterostructure that allows a fast spatial separation of electrons and holes, (2) a high potential barrier preventing the thermal electron escape out of QDs, and (3) an electric field damping layer suppressing the field-assisted escape of electrons out of QDs. The last challenge is to realize partially filled IB states in order to maximize photocurrent generation by two-step IR photon absorption. For this, doping of QDs and photofilling of QDs by light concentration as well as photon confinement thin-film structure are all considered important.

This talk is part of the Semiconductor Physics Group Seminars series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

 

© 2006-2019 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity