CONFERENCE PROCEEDINGS
Advanced Search
Home > Proceedings > Volume 10980 > Article
Presentation
14 May 2019 Synthesis and characterization of PbS/ZnS core/shell nanocrystals (Conference Presentation)
Janice Boercker
Author Affiliations +
Proceedings Volume 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI; 109800W (2019) https://doi.org/10.1117/12.2516304
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States
Abstract
Lead sulfide (PbS) nanocrystals have been used as the active material in high performance, solution-processed, room temperature devices, such as photodetectors, light-emitting diodes, and solar cells. The addition of a zinc sulfide (ZnS) shell to PbS nanocrystals could be advantageous for these devices because it could lead to higher/more stable photoluminescence quantum yields and reduced non-radiative recombination from electron-phonon coupling. However, while ZnS shells have been successfully added to several nanocrystals such as CdS and CdSe it has never been added directly (without a spacer layer) to PbS nanocrystals. This is because it is difficult to add shells to Pb chalcogenide nanocrystals due to their tendency to Ostwald ripen at even moderate temperatures. We have overcome this roadblock and are the first to demonstrate the synthesis of PbS/ZnS core/shell nanocrystals using a “flash” type synthesis with Zn oleate and thioacetamide as the ZnS precursors. We have found that the reaction is self-limiting and deposits a single monolayer of ZnS per shell reaction without causing the PbS nanocrystals to Ostwald ripen. High angle annular dark field scanning transmission electron microscopy (HAADF-STEM) verified the presence of the ZnS shell. Furthermore, the absorbance and photoluminescence peak energies were found to redshift upon adding the ZnS shell due to the relaxation of a ligand-induced tensile strain, as well as wave function leakage into the ZnS shell.
Conference Presentation
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation Download Citation
Janice Boercker "Synthesis and characterization of PbS/ZnS core/shell nanocrystals (Conference Presentation)", Proc. SPIE 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI, 109800W (14 May 2019); https://doi.org/10.1117/12.2516304
ACCESS THE FULL ARTICLE
ORGANIZATIONAL
Sign in with credentials provided by your organization.
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
Members: $17.00
Non-members: $21.00 ADD TO CART
PROCEEDINGS
 PRESENTATION
WATCH
PRESENTATION SAVE TO MY LIBRARY
GET CITATION
Advertisement
Advertisement
KEYWORDS
Nanocrystals
Zinc
Lead
Luminescence
Cadmium sulfide
Chalcogenides
Light emitting diodes
RELATED CONTENT
Subscribe to Digital Library
Receive Erratum Email Alert
Back to Top