期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 118, 期 27, 页码 14833-14839出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp5041579
关键词
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资金
- Spanish Government [MAT2010-20020, NANOSELECT CSD2007-00041]
- German Research Foundation (DFG) [SPP1355]
- ICREA Funding Source: Custom
We address the impact of the relative orientation between donor (D) and acceptor (A) molecules at the D/A heterojunction on the exciton dissociation. For this purpose, two-dimensional heterojunctions of diindenoperylene (DIP) and N,N'-dioctyl-3,4,9,10-perylene tetracarboxylicdiimide (PTCDI-C-8) deposited onto SiO2/Si are grown, which exemplify two model interfaces with the pi-staking direction either perpendicular or parallel to the interface. Aspects related to the morphology of the heterojunctions and charge photogeneration are studied by scanning probe force methods and photoluminescence (PL) spectroscopy. Results from PL spectroscopy indicate that the exciton dissociation is influenced by the different relative molecular orientations of A and D. For the configuration with stronger orbital overlap between A and D at the interface, the exciton dissociation is dominated by recombination from an interfacial charge-transfer state.
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