Nanoparticle-assisted high photoconductive gain in composites of polymer and fullerene
| Autor: | Harold G. Monbouquette, Michael K. F. Lo, Yang Yang, Hsiang-Yu Chen, Guanwen Yang |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
chemistry.chemical_classification
Fullerene Materials science Photochemistry Polymers Photoconductivity Electric Conductivity Biomedical Engineering Nanoparticle Bioengineering Nanotechnology Polymer Condensed Matter Physics Article Atomic and Molecular Physics and Optics Cadmium telluride photovoltaics Nanocrystal chemistry Nanoparticles General Materials Science Quantum efficiency Fullerenes Polymer blend Electrical and Electronic Engineering Composite material |
| Zdroj: | Nature Nanotechnology. 3:543-547 |
| ISSN: | 1748-3395 1748-3387 |
| DOI: | 10.1038/nnano.2008.206 |
| Popis: | Polymer/inorganic nanocrystal composites1–10 offer an attractive means to combine the merits of organic and inorganic materials into novel electronic and photonic systems. However, many applications of these composites are limited by the solubility11 and distribution of nanocrystals (NCs) in polymer matrices. Here, a high photoconductive gain has been achieved by blending cadmium telluride (CdTe) nanoparticles (NPs) into a polymer/fullerene matrix followed by a solvent annealing12 process. The NP surface capping ligand, N-phenyl-N’-methyldithiocarbamate, renders the NPs highly soluble in the polymer blend thereby enabling high nanocrystal loadings. An external quantum efficiency (EQE) as high as ~8000% (at 350nm) is reached at −4.5V. Hole-dominant devices coupled with AFM images are studied to uncover the probable mechanism. We observe a higher concentration of CdTe NPs is located near the cathode/polymer interface. These NPs with trapped electrons assist hole injection into the polymer under reverse bias, which contributes to greater than 100% EQE. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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