Next Article in Journal
Sulfide Stress Cracking Behavior of a Martensitic Steel Controlled by Tempering Temperature
Next Article in Special Issue
Special Issue: Zinc Oxide Nanostructures: Synthesis and Characterization
Previous Article in Journal
Study of Hyperbranched Poly(ethyleneimine) Polymers of Different Molecular Weight and Their Interaction with Epoxy Resin
Previous Article in Special Issue
Chemical Sensing Applications of ZnO Nanomaterials
Open AccessArticle

Factors Affecting the Power Conversion Efficiency in ZnO DSSCs: Nanowire vs. Nanoparticles

1
Renewable Energy and Environment Laboratory, Physics Department, University of Patras, Rion GR-26500, Greece
2
Foundation for Research and Technology Hellas, Institute of Chemical Engineering Sciences (FORTH/ICE-HT), P.O. Box 1414, Rio-Patras GR-26504, Greece
*
Author to whom correspondence should be addressed.
Materials 2018, 11(3), 411; https://doi.org/10.3390/ma11030411
Received: 6 February 2018 / Revised: 5 March 2018 / Accepted: 7 March 2018 / Published: 9 March 2018
(This article belongs to the Special Issue Zinc Oxide Nanostructures: Synthesis and Characterization)
A comparative assessment of nanowire versus nanoparticle-based ZnO dye-sensitized solar cells (DSSCs) is conducted to investigate the main parameters that affect device performance. Towards this aim, the influence of film morphology, dye adsorption, electron recombination and sensitizer pH on the power conversion efficiency (PCE) of the DSSCs is examined. Nanoparticle-based DSSCs with PCEs of up to 6.2% are developed and their main characteristics are examined. The efficiency of corresponding devices based on nanowire arrays (NW) is considerably lower (0.63%) by comparison, mainly due to low light harvesting ability of ZnO nanowire films. The dye loading of nanowire films is found to be approximately an order of magnitude lower than that of nanoparticle-based ones, regardless of their internal surface area. Inefficient anchoring of dye molecules on the semiconductor surface due to repelling electrostatic forces is identified as the main reason for this low dye loading. We propose a method of modifying the sensitizer solution by altering its pH, thereby enhancing dye adsorption. We report an increase in the PCE of nanowire DSSCs from 0.63% to 1.84% as a direct result of using such a modified dye solution. View Full-Text
Keywords: dye-sensitized solar cells; ZnO semiconductor; dye loading; nanowire; pH modification dye-sensitized solar cells; ZnO semiconductor; dye loading; nanowire; pH modification
Show Figures

Graphical abstract

MDPI and ACS Style

Giannouli, M.; Govatsi, Κ.; Syrrokostas, G.; Yannopoulos, S.N.; Leftheriotis, G. Factors Affecting the Power Conversion Efficiency in ZnO DSSCs: Nanowire vs. Nanoparticles. Materials 2018, 11, 411.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop