Bulk heterojunction solar cells based on carbazole co-polymer and fullerene derivative

Petar Petrov^a, Radostina Kalinova^a, Pavlina Mokreva^a, Georgy Grancharov^a, Valeria Gancheva^a, Marushka Sendova-Vassileva^b, Ely Lazarova^b, Christosko Dikov^b, Georgi Popkirov^b, Vitanov Petko^b

^aInstitute of Polymers, Bulgarian Academy of Sciences, ul. Acad. Georgi Bontchev Bl. 103-A, Sofia, 1113, Bulgaria

^bCentral Laboratory of Solar Energy and New Energy Sources, Bulgarian Academy of Sciences, Tzarigradsko Chaussee 72, 1784 Sofia, Bulgaria

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Valeria Gancheva, 348
Publication date: 5th February 2015

Bulk heterojunction polymer solar cells (PSC) based on active layer of poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT) ^1-3 and fullerene derivative [6,6]-phenyl-C₆₁-butyric acid methyl ester (PC₆₁BM) which was sandwiched between transparent anode of indium tin oxide (ITO), a layer of poly(ethylene dioxythiophene) : polystyrenesulfonate (PEDOT:PSS) and various metal cathodes were fabricated. Organic thin films were prepared from 1:1 to 1:4 mass ratio of PCDTBT : PC₆₁BM mixture, and deposited from chloroform, mono- and dichlorobenzene solution by spin coating. In order to control the active layer morphology, the films were subjected to different post-deposition treatments (annealing) by varying temperature in argon media or solvent saturated atmosphere. Optical properties, film thickness, Raman and photoluminescence spectroscopy were used to characterize the active layer. Test devices with different bulk heterojunction architecture were prepared using magnetron sputtered metal or transparent conducting layer contacts. Current–voltage (I-V) characteristics and quantum efficiency spectra of the solar cells were measured and compared.

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