Growth and shape of indium islands on molybdenum at micro-roughened spots created by femtosecond laser pulses

Abstract Indium islands on molybdenum coated glass can be grown in ordered arrays by surface structuring using a femtosecond laser. The effect of varying the molybdenum coated glass substrate temperature and the indium deposition rate on island areal density, volume and geometry is investigated and evaluated in a physical vapor deposition (PVD) process. The joined impact of growth conditions and spacing of the femtosecond laser structured spots on the arrangement and morphology of indium islands is demonstrated. The results yield a deeper understanding of the island growth and its precise adjustment to industrial requirements, which is indispensable for a technological application of such structures at a high throughput, for instance as precursors for the preparation of Cu(In,Ga)Se2 micro concentrator solar cells.

[1]  Carlos Algora,et al.  Handbook of Concentrator Photovoltaic Technology , 2016 .

[2]  M. Ohring.  The Materials Science of Thin Films , 1991 .

[3]  Martin A. Green,et al.  Solar cell efficiency tables (version 47) , 2016 .

[4]  Evans,et al.  Scaling analysis of diffusion-mediated island growth in surface adsorption processes. , 1992, Physical review. B, Condensed matter.

[5]  The Effect of Sputtering Parameters on the Film Properties of Molybdenum Back Contact for CIGS Solar Cells , 2013 .

[6]  Martina Schmid,et al.  Monolithically interconnected lamellar Cu(In,Ga)Se2 micro solar cells under full white light concentration , 2015 .

[7]  W. Warta,et al.  Solar cell efficiency tables (Version 45) , 2015 .

[8]  D. Bäuerle.  Laser Processing and Chemistry , 1996 .

[9]  A. D. Cunha,et al.  Mo bilayer for thin film photovoltaics revisited , 2010 .

[10]  Martina Schmid,et al.  Regularly arranged indium islands on glass/molybdenum substrates upon femtosecond laser and physical vapor deposition processing , 2016 .

[11]  F. F. Dyshekova,et al.  The surface tension of indium: Methods and results of investigations , 2014 .

[12]  Daniel Lincot,et al.  Resistive and thermal scale effects for Cu(In, Ga)Se2 polycrystalline thin film microcells under concentration , 2011 .

[13]  V. Ozoliņš,et al.  A technique for the measurement of surface diffusion coefficient and activation energy of Ge adatom on Si(001) , 2004 .

[14]  Zh. M. Wang,et al.  Observation of change in critical thickness of In droplet formation on GaAs(100) , 2007, Journal of physics. Condensed matter : an Institute of Physics journal.

[15]  Daniel Lincot,et al.  Cu(In, Ga)Se2 microcells: High efficiency and low material consumption , 2013 .