Quantum Dot Growth Technology by MBE for Advanced Photovoltaics

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• Professor Yoshitaka Okada
• Monday 23 November 2015, 14:00-17:00
• Mott Seminar Room (Mott Building Room 531), Cavendish Laboratory.

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 – 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.

This talk is included in these lists:

• All Cavendish Laboratory Seminars
• All Talks (aka the CURE list)
• Centre for Health Leadership and Enterprise
• Featured lists
• ME Seminar
• Mott Seminar Room (Mott Building Room 531), Cavendish Laboratory
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• School of Physical Sciences
• Semiconductor Physics Group Seminars
• Thin Film Magnetic Talks

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