Charge Photogeneration and Transport in AgBiS2 Nanocrystal Films for Photovoltaics


Solution‐processed AgBiS2 nanocrystal films are a promising material for non‐toxic, earth‐abundant solar cells. While solar cells with good device efficiency have been demonstrated, so far, hardly anything is known about charge generation, transport, and recombination processes in these films. Here, a photoinduced time‐resolved microwave conductivity study on AgBiS2 nanocrystal films is presented. By modelling the experimental data with density‐dependent recombination processes, the product of the temperature‐dependent electron and hole quantum yield and mobility, and the electron and hole recombination kinetics are determined.

Our results on charge transport and recombination dynamics in films of AgBiS2 nanocrystals got recently published in Solar RRL.

VHTO Beeldenbrekers les op Jan Vermeerschool in Delft

I visited the Jan Vermeerschool in Delft in the framework of VHTO’s beeldenbrekers programme to tell children aged 4 and 5 about my job as a researcher. The children were very enthusiast and interactive. It was actually striking to see how much they already now about energy, the sun, and the universe. I got various questions ranging from the big bang to the colour of the sun and why it is red in the evening and gone at night. They enjoyed a lot turning on and off a fan by shining light on a solar cell.

Mobility and Decay Dynamics of Charge Carriers in One-Dimensional Selenium van der Waals Solid

Abstract: Trigonal selenium is a semiconducting van der Waals solid that
consists of helical atomic chains. We studied the mobility and decay dynamics of
excess electrons and holes moving along the selenium chains. Excess charge carriers
were generated by irradiation of powdered selenium with 3 MeV electron pulses.
Their mobility and decay via trapping or recombination was studied by time-resolved
microwave conductivity measurements as a function of temperature. The mobility of
charge carriers along the Se chains is at least ca. 0.5 cm2·V−1·s−1 at room temperature.
Charges decay predominantly by trapping at defects. The appreciable mobility,
together with the potential for large-scale production of Se wires by liquid exfoliation,
makes this material of great interest for use in nanoelectronics.

Our results of the temperature dependent microwave mobility in 1D selenium got recently published in JPC C.

Congratulations to Joeri Benschop

Joeri succesfully defended his Bachelor thesis „Liquid Exfolation of Antimony“ on the 15th of June.

June 2017: Gerben Bartels, Olivier Kuijpers, and Pien Abbink started their end of year laboratory work on liquid exfoliation of antimony.

May 2017: I have presented my recent findings about liquid exfoliation of Black Phosphorus at the EMRS Spring Meeting in Strasbourg, France.

Speeddating with high school girls

On 19th January I joined a speeddating event organized by VHTO at Rijnlands Lyceum in Wassenaar. I was positively surprised by the girls being very interested in Chemistry, Physics, Biology, and Mathematics. I hope that the girls enjoyed this event as much as I did.

September 2016: I have presented my first results about liquid exfoliation of Black Phosphorus at the Nano GE meeting in Berlin, Germany.

FOM/f fellowship granted

I have been awarded with a FOM/f fellowship to perform research at the Optoelectronic Materials group headed by Prof. L. Siebbeles at the TU Delft. The research project started on the 1st of January 2016.