Next Article in Journal
Comparison of Nitrogen Depletion and Repletion on Lipid Production in Yeast and Fungal Species
Previous Article in Journal
An Application of Non-Linear Autoregressive Neural Networks to Predict Energy Consumption in Public Buildings
Previous Article in Special Issue
Effect of Photoanode Design on the Photoelectrochemical Performance of Dye-Sensitized Solar Cells Based on SnO2 Nanocomposite
Article Menu

Export Article

Open AccessArticle
Energies 2016, 9(9), 686; doi:10.3390/en9090686

Diffusion Length Mapping for Dye-Sensitized Solar Cells

1
Centre for Hybrid and Organic Solar Energy (C.H.O.S.E.), Department of Electronic Engineering, University of Rome “Tor Vergata”, via del Politecnico 1, 00133 Rome, Italy
2
Cicci Research srl, Piaz.le Thailandia 5, 58100 Grosseto, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Claudia Barolo
Received: 31 May 2016 / Revised: 18 August 2016 / Accepted: 19 August 2016 / Published: 29 August 2016
(This article belongs to the Special Issue Dye Sensitized Solar Cells)
View Full-Text   |   Download PDF [2712 KB, uploaded 29 August 2016]   |  

Abstract

The diffusion length (L) of photogenerated carriers in the nanoporous electrode is a key parameter that summarizes the collection efficiency behavior in dye-sensitized solar cells (DSCs). At present, there are few techniques able to spatially resolve L over the active area of the device. Most of them require contact patterning and, hence, are intrinsically destructive. Here, we present the first electron diffusion length mapping system for DSCs based on steady state incident photon to collected electron (IPCE) conversion efficiency ( η I P C E ) analysis. The measurement is conducted by acquiring complete transmittance ( T DSC ) and η I P C E spectra from the photo electrode (PE) and counter electrode (CE) for each spatial point in a raster scan manner. L ( x , y ) is obtained by a least square fitting of the IPCE ratio spectrum ( I P C E R = η I P C E -CE η I P C E -PE ). An advanced feature is the ability to acquire η I P C E spectra using low-intensity probe illumination under weakly-absorbed background light (625 nm) with the device biased close to open circuit voltage. These homogeneous conditions permit the linearization of the free electron continuity equation and, hence, to obtain the collection efficiency expressions ( η COL-PE and η COL-CE ). The influence of the parameter’s uncertainty has been quantified by a sensitivity study of L. The result has been validated by quantitatively comparing the average value of L map with the value estimated from electrochemical impedance spectroscopy (EIS). View Full-Text
Keywords: mapping; light-beam-induced current (LBIC); diffusion length; dye-sensitized solar cells (DSCs); spectrally-resolved analysis by transmittance and efficiency mapping (SATEM) mapping; light-beam-induced current (LBIC); diffusion length; dye-sensitized solar cells (DSCs); spectrally-resolved analysis by transmittance and efficiency mapping (SATEM)
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Cinà, L.; Taheri, B.; Reale, A.; Di Carlo, A. Diffusion Length Mapping for Dye-Sensitized Solar Cells. Energies 2016, 9, 686.

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.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top