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The potential of textured front ZnO and flat TCO/metal back contact to improve optical absorption in thin Cu(In,Ga)Se2 solar cells
University of Ljubljana, Faculty of Electrical Engineering.
University of Ljubljana, Faculty of Electrical Engineering.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
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2007 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 515, no 15, 5968-5972 p.Article in journal (Refereed) Published
Abstract [en]

The role of additionally textured front transparent conductive oxide − TCO (ZnO:Al) and flat TCO/metal contact on optical improvements in thin Cu(In,Ga)Se2 (CIGS) solar cells are investigated by means of numerical simulations. A de-coupled analysis of two effects related to additional texturing of front surface of ZnO:Al TCO − (i) enhancement of light scattering and (ii) decreased total reflectance (antireflective effect) − reveals that the improvements in quantum efficiency, QE, and short-circuit current, JSC, of the solar cell originate from an antireflective effect only. In order to improve optical properties of the back contact the introduction of a TCO layer (undoped ZnO) between CIGS and back metal contact is investigated from the optical point of view. In addition to ZnO/Mo, a highly reflective ZnO/Ag contact (ZnO is also assumed to work as a protection layer for Ag) is also included in simulations. Results show significant increase in reflectance related to introduced ZnO in front of Mo. Drastically increased reflectance is obtained if ZnO/Mo is substituted with ZnO/Ag. The improvements in QE and JSC of a thin CIGS solar cell, related to ZnO/metal contacts are presented.

Place, publisher, year, edition, pages
2007. Vol. 515, no 15, 5968-5972 p.
Keyword [en]
CIGS solar cell, Light scattering, Optical modeling, Metal back contact
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-10908DOI: 10.1016/j.tsf.2006.12.093ISI: 000246831600050OAI: oai:DiVA.org:uu-10908DiVA: diva2:38676
Available from: 2007-05-03 Created: 2007-05-03 Last updated: 2017-12-11Bibliographically approved

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Edoff, Marika

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