Influence of the Relative Molecular Orientation on Interfacial Charge-Transfer Excitons at Donor/Acceptor Nanoscale Heterojunctions

被引：28

作者：

Aghamohammadi, Mandieh ^{[1
]}

Fernandez, Anton ^{[1
]}

Schmidt, Malte ^{[1
]}

Perez-Rodriguez, Ana ^{[1
]}

Rodolfo Goni, Alejandro ^{[1
,2
]}

Fraxedas, Jordi ^{[3
,4
]}

Sauthier, Guillaume ^{[3
]}

Paradinas, Markos ^{[1
]}

Ocal, Carmen ^{[1
]}

Barrena, Esther ^{[1
]}

机构：

[1] CSIC, Inst Ciencia Mat Barcelona, Barcelona 08193, Spain

[2] Inst Catalana Recerca & Estudis Avancats, Barcelona 08010, Spain

[3] Inst Catala Nanociencia & Nanotecnol, Barcelona 08193, Spain

[4] CSIC, Barcelona 08193, Spain

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2014年 / 118卷 / 27期

关键词：

OPEN-CIRCUIT VOLTAGE; SOLAR-CELLS; DIINDENOPERYLENE; POLYMER; STATES; FILMS; DISSOCIATION; MORPHOLOGY; SEPARATION; GROWTH;

D O I：

10.1021/jp5041579

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：14833 / 14839

页数：7

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