Devika Padmakumar Nair
Ansys Employee

Yes. share a screenshot of final geometry picture. Provide maximum information single response. 

I repeat, please try to simulate longer time with smaller autoshutoff min. 

Is your simulation single wavelength? please check broadband result and see if the reflection curve is smooth or not. 

I am also suggesting you to set the settings of simulation similar to the example Silicon solar cell with TiO2 pyramid array – Ansys Optics.