Solar absorption enhancement in PV modules

PhD thesis: Absorption Enhancement in Thin-Film Polycrystalline-Silicon Photovoltaic Modules (1996)
University of New South Wales (Sydney, Australia)
with thanks to the Royal Society, UK, for the Rutherford Scholarship that supported me to do this.
Attached is a list of my publications up to Sep. 1998 (when I left the field).  Recently (2018) I have rebooted my ray-tracing programs to look at some new textures for roof-integrated modules - results to come...

Following is a brief summary of my Ph.D research:
  • Modelling of anti-reflection and light-trapping properties of thin silicon films deposited "conformally" on macro-textured substates (with texture size or "period" > film thickness).
  • Uses ray-tracing of average year-round illumination and includes anti-reflection coatings for the top glass surface as well as the silicon-encapsulation surface (and a rear cell reflector).
  • The anti-reflection and light trapping properties are superior to that calculated for a realistic micro-texture, which is modelled using a new kind of ray-tracing program.
  • A low shading-loss contacting scheme for thin-film (or conventional wafer) silicon solar photovoltaic (PV) modules is also proposed.
  • Conclusions:
    • Conformal films on small-sized inverted tetrahedra (triangular based pyramids with dimensions of around 10-50 microns for a film thickness of 1-3 microns) can produce light trapping that is better than a fully randomising "lambertian" scheme, even under isotropic illumination (which was previously considered to be a theoretical limit).
    • From a practical perspective, the best texture is probably "perpendicular grooves", consisting of conformal silicon films on macro-sized grooves oriented perpendicular to North-South grooves on the top glass/encapsulation surface (running downhill to assist rain cleaning), along with an additional mild micro-texture on the front or rear silicon surface.  This offers lower series resistance for current flowing along the silicon grooves towards contacts, compared to a 3D texture.
Related papers are also attached below.

  
         
                                         
                                                                                                                             

Light trapping with conformal thin films on inverted tetrahedra        




Low shading-loss contacting scheme:
        





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David Thorp,
2 Aug 2018, 02:06
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David Thorp,
2 Aug 2018, 00:25
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David Thorp,
30 Jul 2018, 06:40
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David Thorp,
30 Jul 2018, 06:47
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PhD in Word chapters.zip
(1463k)
David Thorp,
30 Jul 2018, 06:46
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PhD pdf.zip
(2049k)
David Thorp,
30 Jul 2018, 06:46
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David Thorp,
5 Jun 2018, 05:02
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pascal ray tracing programs.zip
(238k)
David Thorp,
30 Jul 2018, 06:46
Ċ
David Thorp,
30 Jul 2018, 06:40
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