High open-circuit voltage bulk-heterojunction solar cells by using new dendritic acceptor material

摘要

Many conjugated dendrimers combined with polymers are used in the formation of active layers (donor- acceptor) in organic photovoltaic due to their electronic properties and the ability to tune their absorption ranges. They have low viscosity, good solubility and mutifunctionality. We have applied a new dendrimer acceptor material Poly(amido amine) (PAMAM) dendritic wedge G0.5 (UV absorbance at 445 nm, and Fluorescence emission at 512 nm in MeOH) in organic bulk-heterojunction (OBHJ) solar cell in order to improve their performance and morphology. The low band-gap polymer Poly (3-hexylthiophene-2,5-diyl) (P3HT) was used as the donor material. We obtained high V_(oc) (1 V) and I_(sc) (2×10~(-3) mA/cm~2). The result shows that Poly(amido amine) (PAMAM) dendritic wedge (C28H28N4O5) is a promising acceptor for high performance OBHJ solar cells. Also, the morphology of the active layer was improved.