In the study, the team, which includes scientists from Seoul National University, Chonbuk National University and Gwangju Institute of Science and Technology in Korea, fabricated organic solar cells composed of blended films of poly(3-hexylthiophene) (known as P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (known as PCBM).

The devices feature chemically doped graphene films as transparent and conducting electrodes on plastic substrates. Doping the graphene film reduced its sheet resistance by half, compared with the original undoped material, which delivers a significant performance enhancement to the organic solar cells.

Bending assessment

The flexible organic solar cells, which were fabricated on a PET plastic substrate, retained a power conversion efficiency of 2.5–2.6%, regardless of the bending conditions, even up to a bending radius of 5.2 mm.

The study demonstrates that doped graphene may be a good candidate as a transparent-electrode material for high-performance, flexible solar cells or other types of devices.

More details can be found in the journal Nanotechnology.