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SUMMARY:Light Management Layers Based on Optical Nanostructures: Advancing
  Ultra-Thin Photovoltaics - Rose Scowen\, Cavendish Laboratory\, Universit
 y of Cambridge
DTSTART:20190206T140000Z
DTEND:20190206T150000Z
UID:TALK119785@talks.cam.ac.uk
CONTACT:Dr Kaveh Delfanazari
DESCRIPTION:Satellites in Earth’s orbit require a power source that can 
 produce electrical energy for the duration of the orbit and can withstand 
 the high radiation levels it is subjected to. Ultra-thin layers (less than
  100 nm thick) of photovoltaic material possess an intrinsic tolerance to 
 radiation [1]\, and could potentially be used on space craft without the n
 eed for a cover glass to protect the device from incoming radiation. This 
 could offer flexibility of the device due to the absence of the cover glas
 s and the small dimensions of the material. However\, ultra-thin gallium a
 rsenide (GaAs) photovoltaic cells absorbs less than 10% of incident photon
 s during the first pass [1]. As such\, a form of light management could be
  utilised to increase the number of photons absorbed by the material\, and
  thus produce highly efficient ultra-thin photovoltaic cells [2].\n\nThis 
 talk presents a light management structure produced from the relatively in
 expensive material silicon using a polystyrene nanosphere mask and a modif
 ied Bosch etching process. Structures produced by both a single layer (SL)
  and double layer (DL) of nanospheres were simulated in a photovoltaic dev
 ice. A silicon layer of thickness 100nm with a mask of a SL of nanospheres
  resulted in an improvement in absorption of the incident light of 72.4%\,
  producing 12.4mA/cm2 compared to 9.79mA/cm2 without light management.\n\n
 [1]	L. Hirst\, M. Yakes\, J. Warner\, M. Bennett\, K. Schmieder\, R. Walte
 rs\, and P. Jenkins\, “Intrinsic Radiation Tolerance of Ultra-Thin GaAs 
 Solar Cells\,” Applied Physics Letters\, vol. 109\, no. 3\, p. 033908\, 
 2016.\n\n[2]	Z. Yu\, A. Raman\, and S. Fan\, “Nanophotonic Light-Trappin
 g Theory for Solar Cells\,” Applied Physics A\, vol. 105\, no. 2\, pp. 3
 29–339\, 2011.\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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