Sep 14, 2012
Flexible organic solar cells equipped with graphene electrodes
Nanoelectronics experts in Korea have teamed up to configure low-cost organic solar cells with graphene electrodes. Incorporating graphene into the design allows developers to make use of the material’s remarkable optical, mechanical and electrical properties to create a higher-performance, flexible device.
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.
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.
About the author
The study was conducted by several research teams based in Korea. Sangchul Lee, who is the first author of the manuscript, is a PhD student in the School of Materials Science and Engineering at the Gwangju Institute of Science and Technology. He performed the major experiments of this study. Prof. Takhee Lee of the Department of Physics and Astronomy, Seoul National University and Prof. Seok-In Na from the Graduate School of Flexible and Printable Electronics, Chonbuk National University supervised this project. Other authors – Jun-Seok Yeo, Yongsung Ji, Chunjum Cho, Prof. Dong-Yu Kim and Prof. Byoung Hun Lee in the School of Materials Science and Engineering at the Gwangju Institute of Science and Technology – assisted in experiments and discussion.