期刊
IEEE JOURNAL OF PHOTOVOLTAICS
卷 11, 期 4, 页码 1078-1086出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2021.3068325
关键词
Doping; Photovoltaic cells; Photovoltaic systems; Limiting; Wiring; Silicon; Renewable energy sources; Cell stringing; tandem cells; three-terminal; voltage-matched (VM)
资金
- U.S. Department of Energy [DE-AC36-08GO28308]
- Alliance for Sustainable Energy, LLC
- U.S. Department of Energy Efficiency and Renewable Energy Solar Energy Technologies Office [34911]
Strings constructed from three-terminal tandem (3TT) solar cells offer the performance benefits of voltage-matching, but the circuitry can become complex. The article illustrates the essential features of homogenous voltage-matched (VM) 3TT strings and discusses various configurations and construction of string I(V) curves. Mitigation strategies for reducing end losses intrinsic to these strings are also presented.
Strings constructed from three-terminal tandem (3TT) solar cells offer the performance benefits of voltage-matching (which reduces sensitivity to spectral variation), but without the subcell voltage isolation required by four-terminal cells. However, the circuitry for a 3TT string can become complex, making circuit analysis more challenging. Here, we illustrate the essential features of homogenous voltage-matched (VM) 3TT strings, for which all 3TT cells in the string are nominally identical (with the same design/doping sequence, such that they can be fabricated on the same manufacturing line). Several representative VM string configurations are explicitly considered, and used to describe the general construction of string I(V) curves. End losses intrinsic to these strings are discussed in detail, along with mitigation strategies to minimize their impact. Our analysis agrees with experimental results for eight-cell strings constructed from GaInP/GaAs 3TT devices.
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