10.1021/jp506296j.s001
Yufei Zhong
Yufei
Zhong
Seiichiro Izawa
Seiichiro
Izawa
Kazuhito Hashimoto
Kazuhito
Hashimoto
Keisuke Tajima
Keisuke
Tajima
Tomoyuki Koganezawa
Tomoyuki
Koganezawa
Hiroyuki Yoshida
Hiroyuki
Yoshida
Crystallization-Induced
Energy Level Change of [6,6]-Phenyl‑C<sub>61</sub>-Butyric
Acid Methyl Ester (PCBM) Film: Impact of Electronic
Polarization Energy
American Chemical Society
2015
polarization energy
PCBM molecule
photoelectron spectroscopy
Electronic Polarization EnergyThe effect
Methyl Ester
photoemission spectroscopy
IP
EA
film thickness
0.1 eV
energy levels
electron affinity
Precise measurements
annealing
band gap
2015-01-08 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Crystallization_Induced_Energy_Level_Change_of_6_6_Phenyl_C_sub_61_sub_Butyric_Acid_Methyl_Ester_PCBM_Film_Impact_of_Electronic_Polarization_Energy/2218096
The
effect of thermal annealing on the energy levels of [6,6]-phenyl-C<sub>61</sub>-butyric acid methyl ester (PCBM) films was investigated
using ultraviolet photoelectron spectroscopy, X-ray photoelectron
spectroscopy, and low-energy inverse photoemission spectroscopy. We
observed that thermal annealing at 150 °C induces reductions
of both the ionization potential (IP) and the electron affinity (EA)
with a narrowing of the band gap by 0.1 eV. These changes are associated
with crystallization and a 2.54% reduction in the film thickness.
Precise measurements of both the IP and EA enabled an evaluation of
the effects of the electronic polarization energy in a model based
on the charge localized in a single PCBM molecule.