I am studying the different types of the organic solar cells with the Sentaurus TCAD. It is worth mentioning that I have studied several papers in this regard and I want to simulate to the bulk heterojunction organic solar cell. I should own up to the fact that there are some amazing examples regarding the solar cells in the Sentaurus workbench. But, I faced with a problem at simulating the aforementioned device. However, I think that I have to use the Sprocess module in order to simulate the photoactive bulk heterojunction layer. I would appreciate if anyone could please inform me how can I able to define the bulk-heterojuction stucutre in the sentaurus structure editor (SDE)?