Publicación

Tipo de publicación: Artículos científicos (Publicados en revistas de divulgación o científicas)

Título del artículo: BROOKITE-BASED DYE-SENSITIZED SOLAR CELLS: INFLUENCE OF MORPHOLOGY AND SURFACE CHEMISTRY ON CELL PERFORMANCE

Registrado por: JOURNAL OF PHYSICAL CHEMISTRY C

Año de publicación: 2018

Resumen: The transport and recombination properties of dyesensitized solar cells based on phase-pure anatase and brookite nanomaterials are compared as a function of the surface chemistry and morphology. Phase-pure brookite has been synthesized from amorphous
TiO2 using two different solutions at low and high pH, resulting in different size and morphology of brookite nanoparticles. The smaller short-circuit current density (JSC = 6.6 mA cm?2) for acidic brookite compared to anatase (9.8 mA cm?2) was related to the light harvesting efficiency because of the lower amount of dye adsorbed. However, a larger open-circuit voltage for acidic brookite indicates the promise of the material. The basic brookite-based solar cells gave a very low JSC (0.10 mA cm?2), which increased dramatically by a factor of about 30 after an acid treatment of the films, illustrating the effect of surface chemistry. A combination of experiments shows that the improvement is related to an increase in injection efficiency.
Electrochemical impedance and intensity-modulated photocurrent and photovoltage spectroscopies show that electron transport is faster in the acid-treated basic brookite nanomaterial, related to the larger feature sizes. However, the recombination kinetics is
also significantly faster, with as net result a smaller diffusion length and hence smaller collection efficiency.

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Número de páginas:

Autor(es): DENA POURJAFARI , DAVID REYES-CORONADO , ALBERTO VEGA-POOT , RENAN ESCALANTE , DEBRA KIRKCONNELL-REYES , RODRIGO GARCIA-RODRIGUEZ , JUAN ANTONIO ANTA , GERKO OSKAM VER DOCUMENTO

Campo: Energía

Disciplina: Energías alternativas y renovables

Subdisciplina: Fuentes de energía no convencionales

Número de registro: 19327447