Thank you from Journal of Physical Chemistry Editorial Board

29 12 2013




Henry Snaith to the top 10

21 12 2013

After obtaining major discoveries across 2013 in the perovskite solar cell, Henry Snaith  is named as one of the “ten people who mattered this year” by Nature Publishing Group: http://buff.ly/1hrl5v5

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The perovskite solar cell has also been highlighted in Science‘s Top 10 Breakthroughs of 2013:

Up-and-coming solar cell materials called perovskites made such rapid progress this year that the editors of Science picked them as a runner-up for Breakthrough of the Year. Perovskites are cheap and easy to make. In the lab, they can convert 15% of the energy in sunlight into electricity—still behind commercial silicon solar cells, but gaining fast http://www.sciencemag.org/content/342/6165/1438.2.short





Graphene contact improves the perovskite solar cell

19 12 2013

Low-temperature processed electron collection layers of Graphene/TiO2 nanocomposites in thin film perovskite solar cells

Jacob Tse-Wei Wang , James M. Ball , Eva M. Barea, Antonio Abate , Jack A Alexander-Webber , Jian Huang , Michael Saliba , Iván Mora-Sero , Juan Bisquert , Henry J. Snaith , and R. J. Nicolas

Nano Letters

There has been significant recent interest in solution-processable organic-inorganic perovskite absorbers in solar cells following demonstrations of power conversion efficiencies exceeding the highest reported values for organic and dye-sensitized solar cells. However, to date, the highest efficiencies have been achieved using an electron collection (hole-blocking) layer which still requires sintering at 500 °C for best performance, which is unfavourable for low-cost production, applications on plastic substrates, and fabrication of multi-junction device architectures for even higher efficiencies. Here we report a low-cost, solution-based deposition procedure utilising nanocomposites of graphene and TiO2 nanoparticles as the electron collection layers in meso-superstructured perovskite solar cells. The graphene nanoflakes act as a continuous 2D conductive framework to provide superior charge-collection in the nanocomposites, enabling the entire device to be fabricated at temperatures no higher than 150 °C. These solar cells show remarkable photovoltaic performances with a power conversion efficiency (PCE) up to 15.6 % under simulated AM 1.5 solar illumination which is comparable to control devices using a standard TiO2 electron collection layer sintered at 500 °C. This work demonstrates that graphene/metal oxide nanocomposites have the potential to contribute significantly towards the development of low-cost solar cells.





Energy diagram for water splitting and solar fuel systems

19 12 2013

Energy Diagram of Semiconductor/Electrolyte Junctions

Juan Bisquert, Peter Cendula, Luca Bertoluzzi, and Sixto Gimenez
J. Phys. Chem. Lett. 5, pp 205–207, 2014.
In photoelectrochemistry, the voltage is measured with respect to a reference electrode, or in a two electrode cell, but only the points at the surface of a semiconductor electrode are measured. In solid state devices and surface physics it is important to trace variations of energy and electrostatic potential across different semiconductor layers, as well as the dipoles at their interfaces, which is achieved by plotting all energies with respect to the local vacuum level.
We have noticed that this type of diagram causes some problems for the representation of combinations of materials used for solar fuels, for example, that are becoming increasingly complex. To facilitate the representation and calculation of multiple layer semiconductor electrodes used in solar fuels and photocatalysis, we provide a unified representation of the two conventions in a single diagram. The paper establishes a link between the conventions of electrochemistry and solid state physics, and defines some central quantities as the built-in potential and flatband potential.
energy scheme




Global gender disparities in science

16 12 2013

Nature Comment

Bibliometrics: Global gender disparities in science

Vincent Larivière, Chaoqun Ni, Yves Gingras, Blaise Cronin & Cassidy R. Sugimoto

 

Despite many good intentions and initiatives, gender inequality is still rife in science. Although there are more female than male undergraduate and graduate students in many countries1, there are relatively few female full professors, and gender inequalities in hiring, earnings, funding, satisfaction and patenting persist.





Fine illustrations

13 12 2013

By Jordi Bisquert, artist

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