Publication date: 15th December 2014
Optical losses in a PEC cell account for the substantial part of the solar-to-hydrogen conversion losses. The quantitative analysis of the optical losses is sparse, partially because it requires accurate knowledge of the optical constants of all individual layers. We present a detailed analysis of the optical losses of a typical PEC cell stack based on the combination of UV-Vis measurements and an optical model. The model includes both coherent interference at optically thin layers and incoherent multiple reflection in thick layers.The model has been verified for ALD hematite. Based on the validated optical model, we determined layer absorptances, maximum incident photon-to-current efficiency (IPCE) and spectrally resolved loss channels of reflection, transmission and absorption outside of the semiconductor. The charge carrier generation rate from the optical model differs from the Lambert-Beer law for coherent layers and constitutes directly the input to our electrical model [1]. A coupled optoelectronic model enables the comparison of the measured and simulated IPCE of the photoelectrodes and a detailed understanding of the underlying physical processes.
[1] P. Cendula et al., J. Phys. Chem. C (2014), 10.1021/jp509719d.
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