Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 11, Pages 6162-6168Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am301787q
Keywords
quantum dot-sensitized solar cell; lead sulfide; carbon black; counter electrode; solvothermal; nanoparticle
Funding
- National Key Basic Research Program (973 project) [2012CB932903]
- National Natural Science Foundation of China [20725311, 51072221, 21173260]
- Knowledge Innovation Program of the Chinese Academy of Sciences [KJCX2-YW-W27]
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PbS/carbon black (CB) composite counter electrode (CE) has been fabricated by a low cost and low temperature processable method using the wet chemistry synthesized PbS nanoparticles. The nanosized PbS in the composite CE provides a large area of catalytic sites, and the chain-type CB framework acts as an excellent electrical tunnel for fast electron transport from an external circuit to highly catalytic PbS nanoparticles. The optimized PbS/CB composite CE shows a charge transfer resistance (R-CT) as low as 10.28 Omega cm(2), which is an order of magnitude lower than the value obtained in the previous study on pure PbS CE. The CdS/CdSe quantum dot-sensitized solar cells with the PbS/CB composite CE achieve a photovoltaic conversion efficiency of 3.91% and no degradation of the efficiency over 1000 h under room conditions.
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