Solution-processed bulk heterojunction solar cells with silyl end-capped sexithiophene

Jung Hei Choi, Mohamed E. El-Khouly, Taehee Kim, Youn Su Kim, Ung Chan Yoon, Shunichi Fukuzumi, Kyungkon Kim

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We fabricated solution-processed organic photovoltaic cells (OPVs) using substituted two sexithiophenes, a,w-bis(dimethyl-n-octylsilyl)sexithiophene (DSi-6T) and a,w-dihexylsexithiophene (DH-6T), as electron donors, and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as an electron acceptor. Solution-processed OPVs using DH-6T and DSi-6T showed good photovoltaic properties in spite of their poor solubility. The best performance was observed on DSi-6T: PCBM 1: 5 (w/w) blend cell with an open circuit voltage (V oc) of 0.63 V, short circuit current density (J sc) of 1.34 mA/cm 2, fill factor (FF) of 55%, and power conversion efficiency of 0.44% under AM 1.5 G illumination. Although DH-6T has higher hole mobility than DSi-6T, the DSi-6T: PCBM blend cell showed higher hole mobility than DH-6T: PCBM cell. Therefore, DSi-6T cell showed higher device performance than DH-6T cell due to its silyl substitutions, which lead to the increase of the solubility. The incorporation of solution-processed TiO2 interfacial layer in the DSi-6T: PCBM devices significantly enhances FF due to the reduced charge recombination near active layer/Al interface.

Original languageEnglish
Article number843615
JournalInternational Journal of Photoenergy
StatePublished - 2013

Bibliographical note

Funding Information:
★ Based on a joint work with Eyal Kushilevitz, Rafail Ostrovsky, and Amit Sahai [16]. ★★Supported by ERC Starting Grant 259426, ISF grant 1361/10, and BSF grant 2008411.


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