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Design Rules for Donors in Bulk‐Heterojunction Solar Cells—Towards 10 % Energy‐Conversion Efficiency
Author(s) -
Scharber M. C.,
Mühlbacher D.,
Koppe M.,
Denk P.,
Waldauf C.,
Heeger A. J.,
Brabec C. J.
Publication year - 2006
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200501717
Subject(s) - materials science , conjugated system , polymer solar cell , photovoltaic system , organic solar cell , polymer , band gap , heterojunction , energy conversion efficiency , open circuit voltage , hybrid solar cell , optoelectronics , solar cell , fullerene , chemical engineering , voltage , organic chemistry , composite material , chemistry , electrical engineering , engineering
For bulk‐heterojunction photovoltaic cells fabricated from conjugated polymers and a fullerene derivative, the relation between the open‐circuit voltage ( V oc ) and the oxidation potential for different conjugated polymers is studied. A linear relation between V oc and the oxidation potential is found (see figure). Based on this relation, the energy‐conversion efficiency of a bulk‐heterojunction solar cell is derived as a function of the bandgap and the energy levels of the conjugated polymer.