Capacitive currents and hysteresis in solar cells

25 08 2014

14 08 25 Capacitive currents in solar cells

This is part of my presentation at

Gordon Research Conference: Electron Donor-Acceptor Interactions, Newport, USA, August 3-8, 2014

It is a short illustration of the capacitive currents that may be very significant for perovskite solar cells.

Recently Hui-Seon Kim and Nam-Gyu Park have argued similarly in

Parameters Affecting IV Hysteresis of CH3NH3PbI3 Perovskite Solar Cells: Effects of Perovskite Crystal Size and Mesoporous TiO2 Layer

J. Phys. Chem. Lett., 2014, 5, pp 2927–2934




Best Practices for Reporting on Heterogeneous Photocatalysis

20 08 2014

Best Practices for Reporting on Heterogeneous Photocatalysis

Paper

Jillian M. Buriak (Editor-in-Chief, Chemistry of Materials) ,
University of Alberta
Prashant V. Kamat (Deputy Editor, The Journal of Physical Chemistry Letters) ,
University of Notre Dame
Kirk S. Schanze (Editor-in-Chief, ACS Applied Materials & Interfaces)
University of Florida
ACS Appl. Mater. Interfaces, 2014, 6 (15), pp 11815–11816
DOI: 10.1021/am504389z




Mariam Mirzakhani wins the Field Medal of Mathematics

13 08 2014

A professor of mathematics at Stanford University in California, iranian-native Mariam Mirzakhani won the 2014 Field Medal of Mathematics and becomes the first woman winner. The panel appreciated the Mirzakhani’s innovative contributions in the dynamics and geometry of Riemann surfaces and their moduli spaces.

The Fields Medal is awarded every 4 years to at most 4 mathematicians under 40 years. It is regarded as the highest honor a mathematician can receive.

more information

Maryam-Mirzakhani





Organic photoelectrochemical cells for solar fuel production

7 08 2014

Organic donor-acceptor blends like P3HT-PCBM have been greatly improved in recent years providing high efficiency and stable solar cells. These materials are cheap and versatile. They can be very promising for the production of solar fuels. To this aim the photocurrent must be extracted to an electrolyte to produce the required chemical reactions in solution. This is different than the normal operation of PV cells with two solid contacts. We have developed an important step in this direction showing that the photocurrent of standard organic blends can be extracted quantitatively to a liquid contact for either oxidative or reductive action. We show the extraction of 4 mA cm2 in an organic photoelectrochemcial cell (OPEC) which is the same that the solar cell produces at 1 sun without reflective back layer. This is just a first step , as it is required to find suitable catalytic/protective layers at the organic/liquid interface for water splitting or CO2 reduction, say. But we believe there is a great potential in this system for solar energy conversion.

Organic photoelectrochemical cells with quantitative photocarrier conversion

Antonio Guerrero,   Marta Haro,   Sebastiano Bellani,  Maria Rosa Antognazza,   Laura Meda,   Sixto Gimenez and  Juan Bisquert  
Energy Environ. Sci., 2014

DOI: 10.1039/C4EE01775G
First published online 07 Aug 2014

EES 10 1039C4EE01775G