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ACS Appl Mater Interfaces. 2018 Mar 14;10(10):8611-8620. doi: 10.1021/acsami.7b17815. Epub 2018 Feb 27.

Highly Efficient Bifacial Dye-Sensitized Solar Cells Employing Polymeric Counter Electrodes.

Kang JS1,2, Kim J1,2, Kim JY3, Lee MJ1,2, Kang J1,2, Son YJ1,2, Jeong J1,2, Park SH1,2, Ko MJ4, Sung YE1,2.

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Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Republic of Korea.
School of Chemical and Biological Engineering , Seoul National University , Seoul 08826 , Republic of Korea.
Division of Chemical Engineering , Hoseo University , Asan 31499 , Republic of Korea.
Department of Chemical Engineering , Hanyang University , Seoul 04763 , Republic of Korea.


Dye-sensitized solar cells (DSCs) are promising solar energy conversion devices with aesthetically favorable properties such as being colorful and having transparent features. They are also well-known for high and reliable performance even under ambient lighting, and these advantages distinguish DSCs for applications in window-type building-integrated photovoltaics (BIPVs) that utilize photons from both lamplight and sunlight. Therefore, investigations on bifacial DSCs have been done intensively, but further enhancement in performance under back-illumination is essential for practical window-BIPV applications. In this research, highly efficient bifacial DSCs were prepared by a combination of electropolymerized poly(3,4-ethylenedioxythiphene) (PEDOT) counter electrodes (CEs) and cobalt bipyridine redox ([Co(bpy)3]3+/2+) electrolyte, both of which manifested superior transparency when compared with conventional Pt and iodide counterparts, respectively. Keen electrochemical analyses of PEDOT films verified that superior electrical properties were achievable when the thickness of the film was reduced, while their high electrocatalytic activities were unchanged. The combination of the PEDOT thin film and [Co(bpy)3]3+/2+ electrolyte led to an unprecedented power conversion efficiency among bifacial DSCs under back-illumination, which was also over 85% of that obtained under front-illumination. Furthermore, the advantage of the electropolymerization process, which does not require an elevation of temperature, was demonstrated by flexible bifacial DSC applications.


PEDOT; bifacial solar cells; counter electrodes; dye-sensitized solar cells; electropolymerization


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