Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 33, Pages 22129-22140Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp03593d
Keywords
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Funding
- Tokyo Tech. [25249113, 25790013, 2014-5]
- TEPCO Memorial Foundation
- NEDO
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Dye-sensitized solar cells (DSSCs) with reactive {001} facet-dominant TiO2 have attracted a great deal of attention owing to their high solar cell performance, despite the origin and the variation of the results being controversial. Here, we report the characteristic charge transport properties of DSSCs composed of {001} and {101} facet-dominant TiO2 nanoparticles in order to explain the origin of solar cell performance. Based on transient photocurrent and photovoltage measurements and transient absorption spectroscopy, the energetics of TiO2 semiconductors and dye sensitizers are utilized to understand the electron diffusion, recombination, and injection kinetics to determine solar cell performance. Novel strategies to improve DSSC performance by utilizing the characteristics of {001} facet-dominant TiO2 nanoparticles are proposed, which are (1) enhancement of electron injection and (2) reduction of carrier recombination for J(SC) and V-OC improvement, despite the drawback of slower electron diffusion in the mesoporous network of {001} facet-dominant TiO2.
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