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2016 ; 9856
(ä): ä Nephropedia Template TP
gab.com Text
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Probing Charge Transfer and Hot Carrier Dynamics in Organic Solar Cells with
Terahertz Spectroscopy
#MMPMID28649166
Cunningham PD
; Lane PA
; Melinger JS
; Esenturk O
; Heilweil EJ
Proc SPIE Int Soc Opt Eng
2016[]; 9856
(ä): ä PMID28649166
show ga
Time-resolved terahertz spectroscopy (TRTS) was used to explore charge
generation, transfer, and the role of hot carriers in organic solar cell
materials. Two model molecular photovoltaic systems were investigated: with zinc
phthalocyanine (ZnPc) or alpha-sexathiophene (?-6T) as the electron donors and
buckminsterfullerene (C(60)) as the electron acceptor. TRTS provides charge
carrier conductivity dynamics comprised of changes in both population and
mobility. By using time-resolved optical spectroscopy in conjunction with TRTS,
these two contributions can be disentangled. The sub-picosecond photo-induced
conductivity decay dynamics of C(60) were revealed to be caused by
auto-ionization: the intrinsic process by which charge is generated in molecular
solids. In donor-acceptor blends, the long-lived photo-induced conductivity is
used for weight fraction optimization of the constituents. In nanoscale
multilayer films, the photo-induced conductivity identifies optimal layer
thicknesses. In films of ZnPc/C(60), electron transfer from ZnPc yields hot
charges that localize and become less mobile as they thermalize. Excitation of
high-lying Franck Condon states in C(60) followed by hole-transfer to ZnPc
similarly produces hot charge carriers that self-localize; charge transfer
clearly precedes carrier cooling. This picture is contrasted to charge transfer
in ?-6T/C(60), where hole transfer takes place from a thermalized state and
produces equilibrium carriers that do not show characteristic signs of cooling
and self-localization. These results illustrate the value of terahertz
spectroscopic methods for probing charge transfer reactions.