Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
To compensate for low optical thickness of DSSC resulting from low sensitivity of dyes to larger part of light spectrum, and limited thickness of DSSC, it is now customary to employ scattering entities for increasing the pathlength of light in these devices.
We have studied the effect of a scattering layer sandwiched between two layers of nanostructured (NS) TiO2 electrode on light absorption in the device using Monte Carlo Simulation. The scattering layer is assumed to be formed by embedding 400 nm size TiO2 spheres in NS TiO2 layer. The simulation routine accounted both, enhancement of path length due to scattering and light trapping due to total internal reflection. Material parameters for simulation are taken from published literature. The short circuit current calculations assume that all the generated electron hole pairs contribute.
For same electrode thickness the performance of devices with this configuration is better that DSSC with NS electrod and nearly same to the DSSC with backscattering layer when illuminated from the front. For back illumination the performance of DSSC with scattering layer in the middle is about 3-4 times larger to that with backscattering layer. This is because of high diffuse reflectance in the latter when illumination from back, whereas diffuse reflectance of devices with scattering layer in middle was much lower.
The optimum thickness of scattering layer and the concentration of scattering particles in the device are also evaluated for multilayered electrods with different concentration of scattering particles in different layers.
References
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