Int. J. of Nanomanufacturing   »   2016 Vol.12, No.3/4

 

 

Title: Study on the origin of the open-circuit photovoltage enhancement in TiO2 nanotube-based dye sensitised solar cells

 

Authors: Shan Pang; Zhenwei Zhao; Zuliang Du

 

Addresses:
Key Lab for Special Functional Materials of Ministry of Education, Kaifeng, 475004, China
Key Lab for Special Functional Materials of Ministry of Education, Kaifeng, 475004, China
Key Lab for Special Functional Materials of Ministry of Education, Kaifeng, 475004, China

 

Abstract: A larger value (0.86 V) of open-circuit photovoltage (Voc) of the TiO2 nanotube (NT)-based dye sensitised solar cells (DSSCs) than that of DSSCs constructed from TiO2 nanoparticles (NPs) has been observed. Work function of TiO2 NTs is about 0.3 eV less than that of TiO2 NPs, which indicates that the conduction band in TiO2 NTs may has a more negative shift in comparison with that of TiO2 NPs after TiO2 contacts with oxidative electrolyte. This may be one origin of Voc enhancement. Moreover, comparative analyses on surface photovoltage and transient photovoltage of TiO2 NPs and NTs show that the larger built-in field in the interface between TiO2 NTs and Ti foil can further improve charge separation and transport in the TiO2 NT film, which will result in recombination decrement and charge lifetime increment. This may be the other origin of Voc enhancement.

 

Keywords: TiO2 nanotube arrays; titanium dioxide; titania; open-circuit photovoltage; work function; surface photovoltage; SPV; nanotubes; nanotechnology; sensitised solar cells; DSSC; recombination decrement; charge lifetime.

 

DOI: 10.1504/IJNM.2016.079230

 

Int. J. of Nanomanufacturing, 2016 Vol.12, No.3/4, pp.353 - 362

 

Submission date: 14 Jun 2015
Date of acceptance: 04 Jan 2016
Available online: 20 Sep 2016

 

 

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