Photoconductive Properties of MEH-PPV/InP Nanocomposite Diode

Abstract:

InP nanocrystals were prepared by an economic chemical reaction. A very high density of surface states is found at 0.5 eV below the intrinsic conductive band edge. Mixing these InP nanocrystals with MEH-PPV, obtained the composite. Devices with structure ITO/composite(MEH-PPV)/Al were fabricated and investigated. Photocurrent spectra showed that the interface between a conjugated polymer and a semiconductor nanocrystal can be used to provide efficient charge separation for neutral excitons on both the ground states and excited ones. Incorporation of nanocrystals, the conductivity of diode shows large improvements.

• Periodical: Advanced Materials Research (Volume 531)
• Pages: 31-34
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.531.31
• Online since: June 2012
• Authors: Ya Ting Zhang, Jian Quan Yao
• Keywords: MEH-PPV/InP Nanocrystal Composite, Nanodevice, Photoconductivity

References

[1] Craciun NI, Wildeman J, Blom PWM. Universal Arrhenius Temperature Activated Charge Transport in Diodes from Disordered Organic Semiconductors [J]. Physical Review Letters. 2008; 100(5): 056601.

DOI: 10.1103/physrevlett.100.056601

[2] S. Karg, Meier M, Riess W. light-emitting diodes based on poly–p-phenylene- vinylene: I. Charge-carrier injection and transport [J]. Journal of Applied Physics. 1997; 82(4): 1951-60.

DOI: 10.1063/1.366003

[3] Xu T, Qiao Q. Conjugated polymer-inorganic semiconductor hybrid solar cells [J]. Energy & Environmental Science. (2011).

[4] Tang A-w, Teng F, Jin H, Gao Y-h, Hou Y-b, Liang C-j, et al. Investigation on photoconductive properties of MEH-PPV/CdSe-nanocrystal nanocomposites [J]. Materials Letters. 2007; 61(11–12): 2178-81.

DOI: 10.1016/j.matlet.2006.08.042

[5] Watt A, Eichmann T, Rubinsztein-Dunlop H, Meredith P. Carrier transport in PbS nanocrystal conducting polymer composites [J]. Applied Physics Letters. 2005; 87(25): 253109-1.

DOI: 10.1063/1.2140885

[6] Li L, Protière M, Reiss P. Economic Synthesis of High Quality InP Nanocrystals Using Calcium Phosphide as the Phosphorus Precursor [J]. Chemistry of Materials. 2008; 20(8): 2621-3.

DOI: 10.1021/cm7035579

[7] Xu S, Ziegler J, Nann T. Rapid synthesis of highly luminescent InP and InP/ZnS nanocrystals [J]. Journal of Materials Chemistry. 2008; 18(23): 2653-6.

DOI: 10.1039/b803263g

[8] Mićić OI, Sprague J, Lu Z, Nozik AJ. Highly efficient band‐edge emission from InP quantum dots [J]. Applied Physics Letters. 1996; 68(22): 3150-2.

DOI: 10.1063/1.115807

[9] Fu H, Zunger A. InP quantum dots: Electronic structure, surface effects, and the redshifted emission [J]. Physical Review B. 1997; 56(3): 1496-508.

DOI: 10.1103/physrevb.56.1496

[10] Liu Z, Kumbhar A, Xu D, Zhang J, Sun Z, Fang J. Coreduction Colloidal Synthesis of III–V Nanocrystals: The Case of InP [J]. Angewandte Chemie International Edition. 2008; 47(19): 3540-2.

DOI: 10.1002/anie.200800281

[11] Chandross M, Mazumdar S, Jeglinski S, Wei X, Vardeny ZV, Kwock EW, et al. Excitons in poly(para-phenylenevinylene) [J]. Physical Review B. 1994; 50(19): 14702-5.

DOI: 10.1103/physrevb.50.14702

[12] Greenham NC, Peng X, Alivisatos AP. Charge separation and transport in conjugated-polymer/semiconductor-nanocrystal composites studied by photoluminescence quenching and photoconductivity [J]. Physical Review B. 1996; 54(24): 17628-37.

DOI: 10.1103/physrevb.54.17628