The properties of thin titanium dioxide blocking layers onto TCO in dye-sensitized solar cells (DSCs) have been widely reported as their intensity dependence of illumination intensity. Herein, a further investigation about their functioning with the effect of temperature is developed. The electron recombination process, photovoltage response on illumination intensity and photocurrent-voltage properties for DSCs with/without blocking layer at different temperatures are detected. It is found that the electron recombination via TCO becomes increasingly pronounced with increasing temperature and the effect of blocking layer is extremely temperature dependent. The band bending of the compact layer is more effectively to block electron losses at high temperatures, preventing large falloff of photovoltage. Hence, a resistive layer at the surface of TCO keeps comparable cell performances without falloff over a wide temperature range, while the device without blocking layer shows large decrease by over 10% at high temperature for contrast.
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| http://dx.doi.org/10.1166/jnn.2016.12058 | DOI Listing |
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