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Morphology controlled open circuit voltage in polymer solar cells
Author(s) -
Singh Chetan R.,
Sommer Michael,
Himmerlich Marcel,
Wicklein André,
Krischok Stefan,
Thelakkat Mukundan,
Hoppe Harald
Publication year - 2011
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201105213
Subject(s) - open circuit voltage , acceptor , copolymer , materials science , x ray photoelectron spectroscopy , cathode , polymer , organic solar cell , chemical engineering , voltage , moiety , polymer solar cell , analytical chemistry (journal) , solar cell , optoelectronics , nanotechnology , chemistry , electrical engineering , composite material , organic chemistry , physics , condensed matter physics , engineering
We report a strong dependence of open circuit voltage on the altered morphology of block copolymer (P3HT‐ b ‐PPerAcr) based solar cells. The open circuit voltage increases dramatically by about 300 mV by increasing the amount of acceptor homopolymer within the block copolymer/homopolymer blends. The change in open circuit voltage is found to be in correlation with the enrichment of acceptor moiety at the film surface as identified by Atomic force microscopy (AFM) and X‐ray photoelectron spectroscopy (XPS). Based on this fact, an additional increase in open circuit voltage to its maximum values is achieved by introducing an acceptor buffer layer at the cathode interface. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)