Journal article
Directional Carrier Transfer in Strongly Coupled Binary Nanocrystal Superlattice Films Formed by Assembly and in Situ Ligand Exchange at a Liquid-Air Interface
Journal of physical chemistry. C, v 121(8), pp 4146-4157
02 Mar 2017
Abstract
Two species of monodisperse nanocrystals (NCs) can self-assemble into a variety of complex 2D and 3D periodic structures, or binary NC superlattice (BNSL) films, based on the relative number and size of the NCs. BNSL films offer great promise for both fundamental scientific studies and optoelectronic applications; however, the utility of as-assembled structures has been limited by the insulating ligands that originate from the synthesis of NCs. Here we report the application of an in situ ligand exchange strategy at a liquid air interface to replace the long synthesis ligands with short ligands while preserving the long-range order of BNSL films. This approach is demonstrated for BNSL structures consisting of PbSe NCs of different size combinations and ligands of interest for photovoltaic devices, infrared detectors, and light-emitting diodes. To confirm enhanced coupling introduced by ligand exchange, we show ultrafast (similar to 1 ps) directional carrier transfer across the type-1 heterojunction formed by NCs of different sizes within ligand-exchanged BNSL films. This approach shows the potential promise of functional BNSL films, where the local and long-range energy landscape and electronic coupling can be adjusted by tuning NC composition, size, and interparticle spacing.
Metrics
Details
- Title
- Directional Carrier Transfer in Strongly Coupled Binary Nanocrystal Superlattice Films Formed by Assembly and in Situ Ligand Exchange at a Liquid-Air Interface
- Creators
- Yaoting Wu - Univ Penn, Dept Chem, Philadelphia, PA 19104 USASiming Li - Drexel UniversityNatalie Gogotsi - Univ Penn, Dept Mat Sci & Engn, 3231 Walnut St, Philadelphia, PA 19104 USATianshuo Zhao - Univ Penn, Dept Mat Sci & Engn, 3231 Walnut St, Philadelphia, PA 19104 USABlaise Fleury - Univ Penn, Dept Chem, Philadelphia, PA 19104 USACherie R. Kagan - Univ Penn, Dept Chem, Philadelphia, PA 19104 USAChristopher B. Murray - Univ Penn, Dept Chem, Philadelphia, PA 19104 USAJason B. Baxter - Drexel UniversityArgonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Publication Details
- Journal of physical chemistry. C, v 121(8), pp 4146-4157
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 12
- Grant note
- DE-AC02-06CH11357 / DOE Office of Science by Argonne National Laboratory; United States Department of Energy (DOE) Center for Advanced Solar Photophysics, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences; United States Department of Energy (DOE) CBET-1333649; CBET-1335821 / National Science Foundation; National Science Foundation (NSF) 1335821 / Div Of Chem, Bioeng, Env, & Transp Sys; National Science Foundation (NSF); NSF - Directorate for Engineering (ENG) DE-SC0012704 / U.S. DOE Office of Science Facility at Brookhaven National Laboratory; United States Department of Energy (DOE) 1545884 / NSF PIRE; National Science Foundation (NSF); NSF - Office of the Director (OD)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000395616200006
- Scopus ID
- 2-s2.0-85015240809
- Other Identifier
- 991019168501904721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology