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Enhanced electrocatalytic activity and electrochemical stability of Cu2S/PbS counter electrode for quantum-dot-sensitized solar cells

Title
Enhanced electrocatalytic activity and electrochemical stability of Cu2S/PbS counter electrode for quantum-dot-sensitized solar cells
Authors
Jo, In-RokRajesh, John AnthuvanLee, Young-HoonPark, Jeong-HyunAhn, Kwang-Soon
DGIST Authors
Jo, In-Rok; Rajesh, John Anthuvan; Lee, Young-Hoon; Park, Jeong-Hyun; Ahn, Kwang-Soon
Issue Date
2020-09
Citation
Applied Surface Science, 525, 146643
Type
Article
Article Type
Article
Author Keywords
Counter electrodeElectrocatalytic activityQuantum dot-sensitized solar cellStepwise energy levelSuccessive ionic layer adsorption and reaction
Keywords
EFFICIENTPBSSULFIDEPERFORMANCECOMPOSITEPARTICLECDSE
ISSN
0169-4332
Abstract
A new strategy has been successfully developed for highly efficient copper sulfide/lead sulfide (Cu2S/PbS) counter electrodes (CEs) for quantum-dot-sensitized solar cells (QDSSCs). PbS nanoparticles were grown by successive ionic layer adsorption and reaction (SILAR) technique for various cycles (from 1 to 4) on electrochemically deposited Cu2S nanosheets. All the Cu2S and Cu2S/PbS CEs showed petal-like morphology and nanosized PbS nanoparticles were deposited over the Cu2S nanosheets. All FTO/Cu2S/PbS CEs exhibited superior electrocatalytic activity than FTO/Pt and FTO/Cu2S CEs. In particular, QDSSCs with FTO/Cu2S/PbS CE (3 SILAR cycles) exhibited extremely high short-circuit current density (18.08 mA cm−2) and fill factor (53.55%), resulting in a significantly enhanced power conversion efficiency as high as 5.28%. This is because the FTO/Cu2S/PbS CE not only exhibits the cascaded, stepwise energy level configuration, which enhances the fast charge transportation, but also serves as a blocking layer to prevent electrons from returning from the electrolyte to the Cu2S. Furthermore, FTO/Cu2S/PbS exhibited excellent electrochemical stability unlike FTO/Cu2S, owing to the passivation of PbS. © 2020 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/12065
DOI
10.1016/j.apsusc.2020.146643
Publisher
Elsevier BV
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