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Surface Structure, Optoelectronic Properties and Charge Transport in ZnO nanocrystal/MDMO-PPV Multilayer Films

Surface Structure, Optoelectronic Properties and Charge Transport in ZnO nanocrystal/MDMO-PPV Multilayer Films

Qing Lian, Mu Chen, Muhamad Z Mokhtar, Shanglin Wu, Mingning Zhu, Eric Whittaker, Paul O'Brien, Brian R Saunders

Phys Chem Chem Phys. 2018 May 7;20(17):12260-12271.

PMID: 29687131

Abstract:

Blends of semiconducting nanocrystals and conjugated polymers continue to attract major research interest because of their potential applications in optoelectronic devices, such as solar cells, photodetectors and light-emitting diodes. In this study we investigate the surface structure, morphological and optoelectronic properties of multilayer films constructed from ZnO nanocrystals (NCs) and poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV). The effects of layer number and ZnO concentration (CZnO) used on the multilayer film properties are investigated. An optimised solvent blend enabled well-controlled layers to be sequentially spin coated and the construction of multilayer films containing six ZnO NC (Z) and MDMO-PPV (M) layers (denoted as (ZM)6). Contact angle data showed a strong dependence on CZnO and indicated distinct differences in the coverage of MDMO-PPV by the ZnO NCs. UV-visible spectroscopy showed that the MDMO-PPV absorption increased linearly with the number of layers in the films and demonstrates highly tuneable light absorption. Photoluminescence spectra showed reversible quenching as well as a surprising red-shift of the MDMO-PPV emission peak. Solar cells were constructed to probe vertical photo-generated charge transport. The measurements showed that (ZM)6 devices prepared using CZnO = 14.0 mg mL-1 had a remarkably high open circuit voltage of ∼800 mV. The device power conversion efficiency was similar to that of a control bilayer device prepared using a much thicker MDMO-PPV layer. The results of this study provide insight into the structure-optoelectronic property relationships of new semiconducting multilayer films which should also apply to other semiconducting NC/polymer combinations.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP177716595	MDMO-PPV		177716-59-5	Price

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