Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Demonstration of GaInP2/Si Voltage Matched Tandem Solar Cells

Conference ·
 [1];  [2];  [3];  [2];  [2];  [4];  [5];  [5];  [1];  [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. U.S. Naval Research Laboratory
  3. U.S. Naval Research Laboratory; George Washington University
  4. Veeco MOCVD
  5. Applied Novel Devices
+ Show Author Affiliations
Mechanically-stacked tandem solar cells combining existing photovoltaic technologies present a straightforward path toward higher conversion efficiencies. Voltage-matched configurations have been proposed as a simplified approach for fabricating two terminal modules, but they are subject to performance losses compared to four terminal configurations if voltage-matching conditions are not met. Here, we demonstrate a two terminal voltage-matched GaInP 2 /Si tandem with 23% efficiency. Through a combination of experimental measurement and simulation, we explore the impact of voltage and fill factor mismatches between the top and bottom sub-cell strings. Our results show that efficiency losses are minimized when voltage-mismatches are accommodated by designing the bottom strings to have a higher voltage. Fill factor mismatches due to differences in series resistance also lead to changes in the optimal ratio of the number of cells in the top and bottom sub-cell strings.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1544984
Report Number(s):
NREL/CP-5K00-67836
Country of Publication:
United States
Language:
English

Similar Records

Experimental demonstration of voltage-matched two-terminal tandem minimodules
Journal Article · Sun Dec 30 19:00:00 EST 2018 · Journal of Photonics for Energy · OSTI ID:1501656
Energy Yield Analysis of Multiterminal Si-Based Tandem Solar Cells
Journal Article · Thu Jul 05 20:00:00 EDT 2018 · IEEE Journal of Photovoltaics · OSTI ID:1462474
Homogenous Voltage-Matched Strings Using Three-Terminal Tandem Solar Cells: Fundamentals and End Losses
Journal Article · Tue May 11 20:00:00 EDT 2021 · IEEE Journal of Photovoltaics · OSTI ID:1785087

Related Subjects

14 SOLAR ENERGY
GalnP2
mechanical stack
photovoltaic cells
silicon
voltage matching