期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 122, 期 26, 页码 14277-14288出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b02384
关键词
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资金
- CONACYT
- SENER
- IER-UNAM
- CONACYT-SENER
- Conacyt [CB-2012/17850]
- Programa de Mejoramiento al Profesorado (PROMEP) [UQROO-PTC-106]
- Junta de Andalucia [FQM 1851, FQM 2310]
- Ministerio de Economia y Competitividad of Spain [MAT2013-47192-C3-3-R]
The transport and recombination properties of dye sensitized 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 (J(SC) = 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 J(SC) (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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