Electronic Structure and Dynamics at Organic Donor/Acceptor Interfaces

被引:39
作者
Zhu, Xiaoyang [1 ,2 ,3 ,5 ]
Kahn, Antoine [4 ]
机构
[1] Univ Texas Austin, Dept Chem & Biochem, Austin, TX 78712 USA
[2] So Illinois Univ, Carbondale, IL 62901 USA
[3] Univ Minnesota, Minneapolis, MN 55455 USA
[4] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA
[5] Univ Texas Austin, Fac Chem, Austin, TX 78712 USA
基金
美国国家科学基金会;
关键词
ENERGY-LEVEL ALIGNMENT; COMPOSITE SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; EXCIPLEX FLUORESCENCE; EXCITON DISSOCIATION; CONJUGATED POLYMER; HETEROJUNCTIONS; CHARGE; ACCEPTOR; RECOMBINATION;
D O I
10.1557/mrs2010.582
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present our understanding of the electronic energy landscape and dynamics of charge separation at organic donor/acceptor interfaces. The organic/organic interface serves as a valuable point of reference and plays an important role in emerging electronic and optoelectronic applications, particularly organic photovoltaics (OPVs). The key issue on electronic structure at organic donor/acceptor interfaces is the difference in the lowest unoccupied molecular orbitals or that in the highest occupied molecular orbitals. This difference represents an energy gain needed to overcome the exciton binding energy in a charge-separation process in OPV. A sufficiently large energy gain favors the formation of charge transfer (CT) states that are energetically close to the charge-separation state. At an organic donor/acceptor interface in an OPV device, these high-energy CT states, also called hot CT excitons, are necessary intermediates in a successful charge-separation process.
引用
收藏
页码:443 / 448
页数:6
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