Broadband Photodetectors Enabled by Localized Surface Plasmonic Resonance in Doped Iron Pyrite Nanocrystals
Abstract
The emerging capability to detect light over a broad spectral range is a key to technological applications in sensing, spectroscopy, imaging and communications. Colloidal semiconductor nanocrystal/graphene van der Waals heterojunctions provide a unique scheme that combines the spectral tunability and strong quantum confinement of the semiconductor nanocrystals sensitizers with superior charge mobility of graphene for extraordinary photoconductive gains. While high responsivity has been demonstrated, the spectral range is typically narrow limited by the cutoff of the semiconductor band gap of the nanocrystals. Here, a broadband photosensitizer is reported, based on doped Iron Pyrite nanocubes (FeS2 NCs) that exhibit strong localized surface plasmonic resonance (LSPR) spanning across ultraviolet through visible to near‐infrared (UV–Vis–NIR). Using the printed LSPR FeS2 NCs/graphene van der Waals heterostructure, a broadband UV–Vis–NIR photoresponsivity in exceeding 1.08 × 106 A/W has been demonstrated through development of a ligand‐exchange process to facilitate efficient charge transfer at the LSPR FeS2 NCs/graphene interface. This result demonstrates the viability of the LSPR semiconductor nanocrystal/graphene van der Waals heterostructure for high‐performance broadband optoelectronics with scalability through direct printing.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 14, 2018
- Source ID
- 10.1002/adom.201701241
Entities
People
- Alan Elliot
- Alex Stramel
- Dan Ewing
- Judy Z. Wu
- Maogang Gong
- Matthew Casper
- Qingfeng Liu
- Ridwan Sakidja
- Ryan Goul
Organizations
- Army Research Office
- Missouri State University
- National Science Foundation
- United States Department of Energy
- University of Kansas