Efficiency Enhancement of Quantum Dot Sensitized TiO2/ZnO Nanorod Arrays Solar Cells by Plasmonic Ag Nanoparticles

Efficiency Enhancement of Quantum Dot Sensitized TiO2/ZnO Nanorod Arrays Solar Cells by Plasmonic Ag Nanoparticles

A high efficiency quantum dot sensitized solar cell (QDSC) based on Ag nanoparticles (NPs) decorated TiO2/ZnO nanorod arrays (NAs) photoelectrode has been constructed. The incorporation of Ag NPs to TiO2/ZnO NAs photoelectrode not only increases light harvesting efficiency and facilitates exciton di...

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Veröffentlicht in:ACS applied materials & interfaces 2016-10, Vol.8 (40), p.26675-26682
Hauptverfasser: Zhao, Haifeng, Huang, Fei, Hou, Juan, Liu, Zhiyong, Wu, Qiang, Cao, Haibin, Jing, Qun, Peng, Shanglong, Cao, Guozhong
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container_end_page 26682
container_issue 40
container_start_page 26675
container_title ACS applied materials & interfaces
container_volume 8
creator Zhao, Haifeng
Huang, Fei
Hou, Juan
Liu, Zhiyong
Wu, Qiang
Cao, Haibin
Jing, Qun
Peng, Shanglong
Cao, Guozhong
description A high efficiency quantum dot sensitized solar cell (QDSC) based on Ag nanoparticles (NPs) decorated TiO2/ZnO nanorod arrays (NAs) photoelectrode has been constructed. The incorporation of Ag NPs to TiO2/ZnO NAs photoelectrode not only increases light harvesting efficiency and facilitates exciton dissociation but also decreases surface charge recombination and prolongs electron lifetime, which collectively contribute to improving the J sc of the CdS/CdSe QDs cosensitized solar cells. The direct contact of Ag NPs with TiO2 NPs is undergoing Fermi level alignment; thus, the apparent Fermi level is supposed to trigger an upward shift of more negative potential, which results in an increase the V oc of the QDSCs. As a result, the power conversion efficiency of the QDSCs with Ag NPs decorated TiO2/ZnO NAs photoelectrode reached 5.92%, which is about 22% enhancement of the efficiency for the solar cells without Ag NPs (4.80%).
doi_str_mv 10.1021/acsami.6b06386
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