Role of PbSe structural stabilization in photovoltaic cells

Asil, D. et al. (2015) Role of PbSe structural stabilization in photovoltaic cells. Advanced Functional Materials, 25(6), pp. 928-935. (doi: 10.1002/adfm.201401816)

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Semiconductor nanocrystals are promising materials for printed optoelectronic devices, but their high surface areas are susceptible to forming defects that hinder charge carrier transport. Furthermore, correlation of chalcogenide nanocrystal (NC) material properties with solar cell operation is not straightforward due to the disorder often induced into NC films during processing. Here, an improvement in long-range ordering of PbSe NCs symmetry that results from halide surface passivation is described, and the effects on chemical, optical, and photovoltaic device properties are investigated. Notably, this passivation method leads to a nanometer-scale rearrangement of PbSe NCs during ligand exchange, improving the long-range ordering of nanocrystal symmetry entirely with inorganic surface chemistry. Solar cells constructed with a variety of architectures show varying improvement and suggest that triplet formation and ionization, rather than carrier transport, is the limiting factor in singlet fission solar cells. Compared to existing protocols, our synthesis leads to PbSe nanocrystals with surface-bound chloride ions, reduced sub-bandgap absorption and robust materials and devices that retain performance characteristics many hours longer than their unpassivated counterparts.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Bayliss, Dr Sam
Authors: Asil, D., Walker, B. J., Ehrler, B., Vaynzof, Y., Sepe, A., Bayliss, S., Sadhanala, A., Chow, P. C. Y., Hopkinson, P. E., Steiner, U., Greenham, N. C., and Friend, R. H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Advanced Functional Materials
ISSN (Online):1616-3028
Published Online:22 December 2014

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