EU PVSEC Programme Online
EU PVSEC 2021, 6 - 10 September 2021
Presentation: 3AO.5.1 Two-Terminal III-V//Si Triple-Junction Solar Cells with Power Conversion Efficiency of 35.9 % at AM1.5g
Type: Oral
Date: Monday, 6th September 2021
15:15 - 16:45
Author(s): P. Schygulla, R. Müller, O. Höhn, H. Hauser, B. Bläsi, F. Predan, J. Benick, M. Hermle, F. Dimroth, S.W. Glunz, D. Lackner
Presenter / Speaker: P. Schygulla, Fraunhofer ISE, Freiburg, Germany
Event: Conference Conference
Session: 3AO.5 Tandem Solar Cells Process and Performance
Topic: 3. 5 Tandems
Keywords: MOVPE, III-V/Si Solar Cells, Silicon, Tandem Solar Cells, Multijunction Solar Cell, Wafer Bonding
Summary / Abstract: III-V//Si multi-junction solar cells offer a pathway to increase the power conversion efficiency beyond the fundamental Auger limit of silicon single-junctions. In this work we demonstrate how the efficiency of a twoterminal wafer-bonded III-V//Si triple-junction solar cell is increased from 34.1 % to 35.9 % under an AM1.5g spectrum, the highest reported efficiency for silicon based multi-junction solar cell technologies. This improvement was accomplished by two main factors. First, the integration of a GaInAsP absorber in the middle cell increased the open-circuit voltage by 51 mV. Second, a better current matching of all subcells enhanced the short-circuit current by 0.7 mA/cm².