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      Theoretical limits of the multistacked 1-D and 2-D microstructured inorganic solar cells

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      Author
      Yengel, Emre
      Karaağaç, H.
      Logeeswaran, V. J.
      İslam, M. S.
      Date
      2015-08
      Source Title
      Proceedings - Thin Films for Solar and Energy Technology VII
      Print ISSN
      0277-786X
      Publisher
      SPIE
      Pages
      956103/1 - 956103/7
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      Recent studies in monocrystalline semiconductor solar cells are focused on mechanically stacking multiple cells from different materials to increase the power conversion efficiency. Although, the results show promising increase in the device performance, the cost remains as the main drawback. In this study, we calculated the theoretical limits of multistacked 1D and 2D microstructered inorganic monocrstalline solar cells. This system is studied for Si and Ge material pair. The results show promising improvements in the surface reflection due to enhanced light trapping caused by photon-microstructures interactions. The theoretical results are also supported with surface reflection and angular dependent power conversion efficiency measurements of 2D axial microwall solar cells. We address the challenge of cost reduction by proposing to use our recently reported mass-manufacturable fracture-transfer- printing method which enables the use of a monocrystalline substrate wafer for repeated fabrication of devices by consuming only few microns of materials in each layer of devices. We calculated thickness dependent power conversion efficiencies of multistacked Si/Ge microstructured solar cells and found the power conversion efficiency to saturate at %26 with a combined device thickness of 30 μm. Besides having benefits of fabricating low-cost, light weight, flexible, semi-transparent, and highly efficient devices, the proposed fabrication method is applicable for other III-V materials and compounds to further increase the power conversion efficiency above 35% range. © 2015 SPIE.
      Keywords
      1-D and 2-D microstructure
      Fracture-transfer-printing
      Si/Ge solar cell
      Conversion efficiency
      Cost reduction
      Costs
      Fracture
      Germanium
      Microstructure
      Printing
      Silicon
      Silicon solar cells
      Silicon wafers
      Thin films
      Inorganic solar cells
      Monocrystalline semiconductors
      Monocrystalline substrates
      Multistacked PV
      Power conversion efficiencies
      Si/Ge
      Surface reflections
      Transfer printing
      Solar cells
      Permalink
      http://hdl.handle.net/11693/28086
      Published Version (Please cite this version)
      http://dx.doi.org/10.1117/12.2188355
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      • Department of Electrical and Electronics Engineering 3524
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