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      Efficient perovskite light-emitting diodes featuring nanometre-sized crystallites

      Author(s): , , , , , , ,
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      Journal: Nature Photonics
      Publisher: Springer Nature

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          Abstract

          Perovskite nanocrystal LEDs featuring long-chain ammonium cations offer improved stability and efficiency.

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          Efficient, high yield perovskite photovoltaic devices grown by interdiffusion of solution-processed precursor stacking layers

          Zhengguo Xiao, Jing-Cheng Bi, Yuchuan Shao … (2014)
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            Excitons in nanoscale systems.

            Gregory D. Scholes, Garry Rumbles (2006)
            Nanoscale systems are forecast to be a means of integrating desirable attributes of molecular and bulk regimes into easily processed materials. Notable examples include plastic light-emitting devices and organic solar cells, the operation of which hinge on the formation of electronic excited states, excitons, in complex nanostructured materials. The spectroscopy of nanoscale materials reveals details of their collective excited states, characterized by atoms or molecules working together to capture and redistribute excitation. What is special about excitons in nanometre-sized materials? Here we present a cross-disciplinary review of the essential characteristics of excitons in nanoscience. Topics covered include confinement effects, localization versus delocalization, exciton binding energy, exchange interactions and exciton fine structure, exciton-vibration coupling and dynamics of excitons. Important examples are presented in a commentary that overviews the present understanding of excitons in quantum dots, conjugated polymers, carbon nanotubes and photosynthetic light-harvesting antenna complexes.
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              Modeling Anomalous Hysteresis in Perovskite Solar Cells.

              Stephan Van Reenen, Martijn Kemerink, Henry Snaith (2015)
              Organic-inorganic lead halide perovskites are distinct from most other semiconductors because they exhibit characteristics of both electronic and ionic motion. Accurate understanding of the optoelectronic impact of such properties is important to fully optimize devices and be aware of any limitations of perovskite solar cells and broader optoelectronic devices. Here we use a numerical drift-diffusion model to describe device operation of perovskite solar cells. To achieve hysteresis in the modeled current-voltage characteristics, we must include both ion migration and electronic charge traps, serving as recombination centers. Trapped electronic charges recombine with oppositely charged free electronic carriers, of which the density depends on the bias-dependent ion distribution in the perovskite. Our results therefore show that reduction of either the density of mobile ionic species or carrier trapping at the perovskite interface will remove the adverse hysteresis in perovskite solar cells. This gives a clear target for ongoing research effort and unifies previously conflicting experimental observations and theories.
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                Author and article information

                Journal
                Title: Nature Photonics
                Abbreviated Title: Nature Photon
                Publisher: Springer Nature
                ISSN (Print): 1749-4885
                ISSN (Electronic): 1749-4893
                Publication date Created: January 16 2017
                Publication date (Print): January 16 2017
                Volume:
                Issue:
                Article
                DOI: 10.1038/nphoton.2016.269
                SO-VID: 83bb4c50-797a-4cf1-8ee6-c1f61a6fca3f
                Copyright © © 2017
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