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Enhanced Open‐Circuit Voltage in High Performance Polymer/Fullerene Bulk‐Heterojunction Solar Cells by Cathode Modification with a C 60 Surfactant
Author(s) -
O'Malley Kevin M.,
Li ChangZhi,
Yip HinLap,
Jen Alex K.Y.
Publication year - 2012
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201100522
Subject(s) - materials science , cathode , polymer solar cell , open circuit voltage , optoelectronics , fullerene , energy conversion efficiency , heterojunction , pulmonary surfactant , organic solar cell , band gap , hybrid solar cell , polymer , chemical engineering , nanotechnology , voltage , composite material , organic chemistry , chemistry , engineering , physics , quantum mechanics
A bis‐adduct C 60 surfactant is used to modify the energy‐level alignment at the interface between the photoactive layer and cathode contact of a conventional bulk‐heterojunction solar cell comprised of a low‐bandgap polymer and PC 71 BM . The metal Fermi level pins to that of the surfactant, dramatically increasing the device's open‐circuit voltage regardless of the cathode metal identity, leading to significantly enhanced power‐conversion efficiency (up to 6.22%) and device stability.