LIMMS opens a new postdoctoral position in the laboratory of Professor Takuji Takahashi, Institute of Industrial Science, the University of Tokyo.
Deadline: March, 10th, 2017
This project aims to analyze local dynamics of the photo-generated carriers in solar cells by means of various photo-assisted scanning probe methods, and consequently to contribute toward developing the solar cells with very high conversion efficiency.
In the solar cells, it is very important to understand the dynamics of the photo-generated carriers. In addition, the multi- or micro-crystalline materials which should include a lot of grains and their boundaries have big advantage for the solar cells owing to their low fabrication cost, and therefore the non-uniformity of the characteristic among the different grains and the influences of the grain boundary on the photo-carrier dynamics should be carefully and locally investigated. For such purposes, the scanning probe methods are very powerful because of their very high spatial resolution, and we have already developed the photo-assisted Kelvin probe force microscopy (P-KFM) and the photo-thermal atomic force microscopy (PT-AFM) to investigate the photovoltaic properties and the non-radiative recombination properties of the photo-carriers, respectively. In this project, we will extend those methods to analyze the photo-carrier dynamics in more detail in the micro-crystalline solar cell materials, like CIGS [Cu(In,Ga)Se2] materials. In addition, we will develop a photo-capacitance AFM (PC-AFM) as a novel method to identify the discrete energy levels in the band gap which should act as a recombination center of the photo-carriers. Furthermore, since it is well known that CIGS has a specific band diagram inside of the grains as well as around the grain boundaries leading to built-in electric fields, the influence of those band diagram on the photo-carrier dynamics will be investigated very locally by means of the various photo-assisted scanning probe methods, and based on those knowledge we will aim at finding the guidelines for developing a novel solar cell with very high conversion efficiency.
Fellowship periods and Periods for arrival in Japan :
Two years starting from September 1, 2017 before November 30, 2017
Paid equivalent to the JSPS Postdoctoral position
Doctor graduate researcher with skills in electronics engineering and material science