2-Dimensional optoelectronic simulation for nanostructured organic-inorganic hybrid solar cells

摘要: Hybrid solar cells (HSCs) based on a mixture of organic and inorganic semiconductor materials attract lot attention owing to the combination desirable properties both materials. Due low exciton diffusion length light harvesting issues, nanostructures are often employed in HSCs. However, most numerical models over-simplify complicated bulk heterojunction (BHJ) into homojunction configuration which losses insights charge transport. Moreover, designing achieve carrier collection is essential, but rather complicated. In this work, we develop methodology two-dimensional (2D) optical electrical simulations tailored for hybrid system. The simulation employs finite-difference time-domain (FDTD) technique calculate electromagnetic field obtain generation rate nanostructure. Next, an calculation 2D self-consistent drift-diffusion Poisson solver uses finite element method (FEM). As result, our works allows analysis nanostructured theoretical approach has been validated P3HT/PCBM BHJ cells. study, structures Si nanowires (NWs)/ poly(3-hexylthiophene)(P3HT) used as hypothetical material system, where interpenetrating network rectangular channels consisting SiNWs P3HT assumed. results show that NWs facilitates transmission absorption sunlight inside photoactive layer. We then investigate device current-voltage characteristics function recombination rate, barrier heights anode cathode, structural interfaces. also optimization with embedded or nanoparticles.