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Influence of 4-guanidinobutyric Acid as Coadsorbent in Reducing Recombination in Dye-Sensitized Solar Cells

Influence of 4-guanidinobutyric Acid as Coadsorbent in Reducing Recombination in Dye-Sensitized Solar Cells

Zhipan Zhang, Shaik M Zakeeruddin, Brian C O'Regan, Robin Humphry-Baker, Michael Grätzel

J Phys Chem B. 2005 Nov 24;109(46):21818-24.

PMID: 16853833

Abstract:

Dye-sensitized solar cells based on nanocrystalline TiO(2) have been fabricated with an amphiphilic ruthenium sensitizer [Ru (4,4'-dicarboxylic acid-2,2'-bipyridine) (4,4'-bis(p-hexyloxystyryl)-2,2'-bipyridine)(NCS)(2)], coded as K-19, and 4-guanidinobutyric acid (GBA) as coadsorbent. The cells showed a approximately 50 mV increase in open-circuit voltage and a similar current in comparison with cells without GBA cografting. The performance of both types of devices was evaluated on the basis of their photocurrent-voltage characteristics, dark current measurements, cyclic voltammetry, electrochemical impedance spectroscopy, and phototransient decay methods. The results indicate that GBA shifted the conduction band of TiO(2) toward a more negative potential and reduced the interfacial charge-transfer reaction from conduction band electrons to triiodide in the electrolyte (also known as the back reaction). In addition, the devices with GBA cografting showed an excellent stability with a power conversion efficiency of approximately 8% under simulated full sunlight (air mass 1.5, 100 mW cm(-2)) during visible light soaking at 60 degrees C.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP847665456	K19 Dye		847665-45-6	Price

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