Center on Materials

1
Electro-optic polymers for THz applications
ACHIEVEMENTS (1) Collaborative efforts between
UW and UMBC have led to improved poling
procedures resulting in electro-optic
coefficients gt150 pm/V for thick polymer films
(2) Gap-free 16-THz generation and detection at
telecommunication wavelengths has been achieved
using an AJTB203 polymer emitter-sensor pair
Atmospheric attenuation isgt 200 dB/km in the 0-9
THz band
Atmospheric attenuation is significantly lower in
the 9-30 THz band
0.1-16 THz generation and detection using TB203
2
Ultrafast THz spectroscopy of organic solar cell
materials
ACHIEVEMENTS (1) Optical pump-THz probe
examination of carrier dynamics of above and
below gap excitation in P3HT with sub-ps
resolution (2) Optical pump-THz probe examination
of ultra-fast charge transfer from P3HT to PCBM
in P3HT/PCBM bulk heterojunctions.
IMPACT Understanding charge carrier dynamics in
organic photovoltaics is critical for improving
device efficiencies
Characteristic of inhibited long-range transport
e-
h?
h?
Similar dynamics for both excitation wavelengths
Ultra-fast charge transfer from P3HT to PCBM