Ultrafast time-resolved photoluminescence of Zn-Se-Te multilayers with type-II ZnTe/ZnSe quantum dots

Maurice C-K. Cheung; Ian R. Sellers; Igor L. Kuskovsky; Alexander N. Cartwright; Bruce D. McCombe

doi:10.1117/12.764112

14 February 2008 Ultrafast time-resolved photoluminescence of Zn-Se-Te multilayers with type-II ZnTe/ZnSe quantum dots

Maurice C-K. Cheung, Ian R. Sellers, Igor L. Kuskovsky, Alexander N. Cartwright, Bruce D. McCombe

Proceedings Volume 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII; 68921A (2008) https://doi.org/10.1117/12.764112
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

Time-resolved photoluminescence (TRPL) across the full spectrum of a 240 layer ZnTe/ZnSe super-lattice structure has been performed using a femtosecond Ti-Sapphire laser and a streak camera system for detection. A significant change of the PL lifetime is observed across the emission spectrum decreasing smoothly from ~ 100 ns at 2.35 eV, to less than a few nanoseconds at 2.8 eV. The increase of the PL lifetime in the low energy region of the emission spectrum is strong evidence to support the formation of type-II quantum dots (QDs) from excitons bound to clusters of Te-atoms. In such QDs the confined holes and the free electrons are spatially separated, thus increasing the radiative lifetime. This result is consistent with recent photoluminescence (PL) measurements in which evidence of the combined contribution of excitons bound isoelectronically to Te-atoms, and type-II QDs was observed.

Citation Download Citation

Maurice C-K. Cheung, Ian R. Sellers, Igor L. Kuskovsky, Alexander N. Cartwright, and Bruce D. McCombe "Ultrafast time-resolved photoluminescence of Zn-Se-Te multilayers with type-II ZnTe/ZnSe quantum dots", Proc. SPIE 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII, 68921A (14 February 2008); https://doi.org/10.1117/12.764112

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available