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Title: Charge transport through split photoelectrodes in dye-sensitized solar cells

Charge transport and recombination are relatively ignored parameters while upscaling dye-sensitized solar cells (DSCs). Enhanced photovoltaic parameters are anticipated by merely widening the devices physical dimensions, viz., thickness and area as evident from the device design adopted in reported large area DSCs. These strip designs lead to ≤50% loss in photocurrent compared to the high efficiency lab scale devices. Herein, we report that the key to achieving higher current density (J{sub SC}) is optimized diffusion volume rather than the increased photoelectrode area because kinetics of the devices is strongly influenced by the varied choices of diffusion pathways upon increasing the electrode area. For a given electrode area and thickness, we altered the photoelectrode design by splitting the electrode into multiple fractions to restrict the electron diffusion pathways. We observed a correlation between the device physical dimensions and its charge collection efficiency via current-voltage and impedance spectroscopy measurements. The modified electrode designs showed >50% increased J{sub SC} due to shorter transport time, higher recombination resistance and enhanced charge collection efficiency compared to the conventional ones despite their similar active volume (∼3.36 × 10{sup −4} cm{sup 3}). A detailed charge transport characteristic of the split devices and their comparison with single electrode configuration is describedmore » in this article.« less
Authors:
; ; ;  [1] ;  [2]
  1. Nanostructured Renewable Energy Materials Laboratory, Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, Kuantan 26300 (Malaysia)
  2. Faculty of Electrical and Electronics Engineering, Universiti Malaysia Pahang, Kuantan 26600 (Malaysia)
Publication Date:
OSTI Identifier:
22273517
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CALORIMETRY; CHARGE COLLECTION; CHARGE TRANSPORT; COMPARATIVE EVALUATIONS; CORRELATIONS; CURRENT DENSITY; DIFFUSION; DYES; EFFICIENCY; ELECTRIC CONDUCTIVITY; ELECTRODES; ELECTRONS; PHOTOVOLTAIC EFFECT; RECOMBINATION; SOLAR CELLS; SPECTROSCOPY