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When a graphite sheet is used since the substrate, carbon can diffuse into the Ag level in the subsequent p-i-n procedure at 200-400 °C. To stop this, we added an oxide level as a carbon diffusion buffer involving the carbon substrate additionally the straight back reflector. For the carbon diffusion buffer, silicon oxide (SiO2) or tin oxide (SnOx) ended up being used. We evaluated the thermal security for the straight back reflector of a carbon substrate utilizing secondary-ion size spec