Journal
DALTON TRANSACTIONS
Volume 45, Issue 20, Pages 8447-8457Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6dt00283h
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Funding
- Basic Research Laboratory through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [NRF-2015R1A4A1041584]
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To make quantum dot-sensitized solar cells (QDSSCs) competitive, we investigated the effect of Ni2+ ion incorporation into a CdS layer to create long-lived charge carriers and reduce the electron-hole recombination. The Ni2+ -doped CdS (simplified as CdNiS) QD layer was introduced to a TiO2 surface via the simple successive ionic layer adsorption and reaction (SILAR) method in order to introduce intermediateenergy levels in the QDs. The effects of different Ni2+ concentrations (5, 10, 15, and 20 mM) on the physical, chemical, and photovoltaic properties of the QDSSCs were investigated. The Ni2+ dopant improves the light absorption of the device, accelerates the electron injection kinetics, and reduces the charge recombination, which results in improved charge transfer and collection. The 15% CdNiS cell exhibits the best photovoltaic performance with a power conversion efficiency (eta) of 3.11% (J(SC) = 8.91 mA cm(-2), VOC = 0.643 V, FF = 0.543) under one full sun illumination (AM 1.5 G). These results are among the best achieved for CdS-based QDSSCs. Electrochemical impedance spectroscopy (EIS) and open circuit voltage decay (OCVD) measurements confirm that the Ni2+ dopant can suppress charge recombination, prolong the electron lifetime, and improve the power conversion efficiency of the cells.
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