RETRACTED: Efficient bulk heterojunction solar cells using tetrasubstituted pyrene derivatives as donors

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of the Editors.The authors have plagiarized part of a paper that had already appeared in Organic Electronics, Volume 13, Issue 2, p 273–282, doi: http://dx.doi.org/10.1016/j.orgel.2011.11.016.One of the conditions of submission of a paper for publication is that authors declare explicitly that their work is original and has not appeared in a publication elsewhere. Re-use of any text should be appropriately cited. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process.In a joint statement the authors have declared that Dr. K. R. Justin Thomas, Dr. Neha Kapoor and Dr. M. S. Roy were not aware of the plagiarized part before submission. All authors sincerely apologize to readers, reviewers and editors for the unintentional act.As a consequence, pages 2201–2209 originally occupied by the retracted article are missing from the printed issue.The publisher apologizes for any inconvenience this may cause.