Role of HA additive in quantum dot solar cell with Co[(bpy)3]2+/3+-based electrolyte

Title
Role of HA additive in quantum dot solar cell with Co[(bpy)3]2+/3+-based electrolyte
Authors
채상윤황윤정주오심
Issue Date
2014-06
Publisher
RSC advances
Citation
VOL 4, NO 51, 26907-26911
Abstract
A strategy to improve the power conversion efficiency (η) in a quantum dot solar cell (QDSC) is demonstrated with a model system of TiO2/CdS QDSCs. When the electrolyte is changed from polysulfide to a [Co(bpy)3]2+/3+ complex, a higher Voc and η are observed because of its low redox potential. To resolve the slow diffusion nature of [Co(bpy)3]2+/3+ complexes within dense TiO2 nanoparticle/CdS film, a TiO2 nanorod (NR) array anode is applied, which increases η by more than a factor of 3. In addition, introduction of hexanoic acid (HA) in TiO2 NR/CdS film is found to improve η (Jsc as well as Voc) by alleviating the back recombination loss between CoIII and the TiO2 surface. Electrochemical impedance spectroscopy indicates that the charge transfer resistance on the photoanode decreases by suppressing the interfacial charge recombination after HA treatment, although adding HA in the electrolyte impedes diffusion resistance.
URI
http://pubs.kist.re.kr/handle/201004/50442
ISSN
20462069
Appears in Collections:
KIST Publication > Article
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