Manufacturing a highly efficient organic solar cell (11.4%) using Graphene as an all-inclusive layer of electrons

Inventors: Teacher Dr. Mirvat Kazim Erhima, Assist. Prof. Dr. Bushra Abbas Hassan/Department of Physics, College of Science, University of Baghdad

Abstract

We reveal high efficient polymer solar cells (PSCs) based on poly(3-hexylthiophene) (P3HT) and fullerene derivatives Indene-C70 Bisadduct (IC₇₀BA)) by using Graphene (Gr) as electron collection layer (ECL) between the Al cathode and photoactive layer as a novel work. The Gr buffer layer was simply prepared by spin-coating solution of Gr on active layer and then baked at 100 ˚C for 25 min.

The short-circuit current density (J_sc) and the open-circuit voltage (V_oc) of the devices can be instantaneously and significantly enhanced by adjusting the electron collection layer. The efficiency (η_e) of the device with Gr buffer layer reaches to 11.4% under the illumination 100 mW/cm², in contrast with that (5.8%) of the device without Gr buffer layer under the same experimental conditions. The results showed that Gr is a talented electron collection layer for PSCs.