Measuring Charge-Separation Dynamics via Oligomer Length Variation
Measuring Charge-Separation Dynamics via Oligomer Length Variation
复制标题
通过低聚物长度变化测量电荷分离动力学
DOI:
10.1021/jp508032k
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发表时间:
2014
影响因子:
3.7
通讯作者:
C. Lambert
中科院分区:
文献类型:
--
作者:
F. Kanal;S. Ruetzel;M. Moos;M. Holzapfel;T. Brixner;C. Lambert
We study the optically induced charge-transfer dynamics in donor–acceptor oligomers of different chain lengths. The combination of systematic synthesis, electrochemical measurements, and ultrafast transient absorption spectroscopy allows us to determine the charge-transfer properties and dynamics in donor–acceptor systems of confined lengths. Calculations within Marcus and Jortner electron-transfer theory explain the different charge-recombination times. For compounds in which complete charge separation can occur we deduce fast equilibration between different charge-transfer configurations prior to charge recombination. Thus, monoexponential charge-recombination kinetics are observed, as only the smallest-barrier configuration leads to relaxation to the ground state. The systematic oligomer length variation along with time-resolved spectroscopy allows us to determine how far apart charges can be separated in multichromophore donor–acceptor systems. Such information is relevant for understanding on a microscopic level the charge carrier mobility in materials for organic electronics and photovoltaics.
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