Identifying and Eliminating Emissive Sub-bandgap States in Thin Films of PbS Nanocrystals

Title
Identifying and Eliminating Emissive Sub-bandgap States in Thin Films of PbS Nanocrystals
Authors
황규원김동훈Jose M. CorderoMark W. B. WilsonChia-Hao M. ChuangJeffrey C. GrossmanMoungi G. Bawendi
Keywords
lead sulfide; origin of trap states; quantum dots; sub-bandgap emission; trap density
Issue Date
2015-08
Publisher
Advanced materials
Citation
VOL 27, NO 30-4486
Abstract
Chemical oxidation of under-charged Pb atoms reduces the density of trap states by a factor of 40 in films of colloidal PbS quantum dots for devices. These emissive sub-bandgap states are a byproduct of several standard ligand-exchange procedures. X-ray photoelectron spectroscopy measurements and density function theory simulations demonstrate that they are associated with under-charged Pb
URI
http://pubs.kist.re.kr/handle/201004/65239
ISSN
0935-9648
Appears in Collections:
KIST Publication > Article
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