Organic Bulk Heterojunction Solar Cell Based on Rosebengal: ncTiO_2 and Parameter Extraction by Simulation

摘要

In bulk heterojunction solar cells, the donor and acceptor materials are intimately blended throughout the bulk, so that the excitons generated will reach the interface within their lifetime. In this work, Rosebengal (RB) is used as the donor material and nanocrystalline Titanium dioxide (ncTiO_2) as the acceptor material. Devices with device structure ITO/RB: TiO_2/Ag are prepared and their optical and electrical properties are compared at different temperatures. Optical absorption spectroscopic analysis shows that the absorption of Rose bengal ranges from 650-800 nm corresponding to a band gap of 1.98 eV. Cyclic voltametric analysis, and photo voltaic properties are analysed. Using simulation, the dark current parameters such as ideality factor (n), mobility (μ) potential barrier (Φ_b) and carrier concentration are extracted and tabulated.