Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 4, Pages 517-523Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz3000382
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Funding
- ICARUS [PITN-GA-2009-237900]
- PHOTOFET [FP7-ICT-248052]
- Italian projects Rete Nazionale di Ricerca sulle Nanoscienze ItalNanoNet (FIRB) [RBPROSJH2P]
- EFOR-Energia da Fonti Rinnovabili
- ESCORT (Efficient Solar Cells based on Organic and hybrid Technology)
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We present a spectroscopic investigation on a new hyperbranched cadmium selenide nanocrystals (CdSe NC)/poly(3-hexylthiophene) (P3HT) blend, a potentially good active component in hybrid photovoltaics. Combined ultrafast transient absorption spectroscopy and morphological investigations by means of an ultrafast confocal microscope reveal a strong influence of the complex local structure on the photogenerated carrier dynamics. In particular, we map the electron-transfer process across the hybrid NC/polymer interface, and we reveal that charge separation occurs through a preferential pathway from the CdSe nanobranches to the P3HT chains. Efficient charge generation at the distributed heterojunction is also confirmed by scanning kelvin probe force microscopy measurements.
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