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Impact of the growth conditions of colloidal PbS nanocrystals on photovoltaic device performance
Author(s):
Affiliation:
NRC Institute for Microstructural Sciences; NRC Steacie Institute for Molecular Sciences; National Research Council Canada
Language:
English
Type:
Article
Journal:
Chemistry of Materials
Date:
2011
Pages :
1805-1810
NPArC #:
19739628
Keywords:
PbS nanocrystals; photovoltaic devices; nanocrystal growth rate; transient photocurrent measurement
Program(s):
Materials for Energy and the Environment; Matériaux ayant des applications énergétiques et environnementales
Group(s):
Molecular and Nanomaterials Architecture; Architecture des molécules et nanomatériaux
Abstract:
Here, we present a detailed investigation on the influence of the growth conditions of colloidal lead sulfide (PbS) nanocrystals on photovoltaic device performance. The PbS nanocrystals were synthesized in a noncoordinating solvent, 1-octadecene, using oleic acid (OA) as the ligand. It was found that both the feeding molar ratio of OA to Pb and the reactant concentration were critical for controlling the growth rate of nanocrystals. Transient photocurrent (TPC) measurements revealed reduced trap density in thin films using the slow-growth nanocrystals. Solar cells based on the slow-growth nanocrystals showed a high power conversion efficiency (PCE) of 3.8% under simulated Air Mass 1.5 Global (AM 1.5G) irradiation (100 mW/cm2), a 2-fold increase in PCE, compared to the fast-growth nanocrystals, because of the remarkable improvement in the open-circuit voltage and fill factor in the PV devices.
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