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Oxygen‐ and Water‐Based Degradation in [6,6]‐Phenyl‐C 61 ‐Butyric Acid Methyl Ester (PCBM) Films
Author(s) -
Bao Qinye,
Liu Xianjie,
Braun Slawomir,
Fahlman Mats
Publication year - 2014
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.201301272
Subject(s) - oxygen , butyric acid , doping , materials science , chemical engineering , photochemistry , organic chemistry , chemistry , optoelectronics , engineering
Effects of in situ oxygen/water exposure on the energetics of [6,6]‐phenyl‐C 61 ‐butyric acid methyl ester (PCBM) films are presented. For oxygen exposure, the work function is downshifted by ≈0.15 eV compared to the ideal integer charge transfer (ICT) curve for pristine PCBM, which is incompatible with significant introduction of electron trap states or p‐doping. Water induces the highest occupied molecular orbital (HOMO) structure to undergo strong, irreversible modifications accompanied by a chemical interaction with PCBM.