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

Emre Yengel*, Hakan Karaagac, V. J. Logeeswaran, M. Saif Islam

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationThin Films for Solar and Energy Technology VII
EditorsLouay A. Eldada, Michael J. Heben
ISBN (Electronic)9781628417272
Publication statusPublished - 2015
EventThin Films for Solar and Energy Technology VII - San Diego, United States
Duration: 9 Aug 201510 Aug 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceThin Films for Solar and Energy Technology VII
Country/TerritoryUnited States
CitySan Diego

Bibliographical note

Publisher Copyright:
© 2015 SPIE.


  • 1-D and 2-D microstructure
  • Fracture-transfer-printing
  • Multistacked PV
  • Si/Ge solar cell


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