Back-contacted bottom cells with three terminals: Maximizing power extraction from current-mismatched tandem cells

Rienäcker, Michael; Warren, Emily L.; Schnabel, Manuel; Schulte‐Huxel, Henning; Niepelt, Raphael; Brendel, Rolf; Stradins, Pauls; Tamboli, Adele C.; Peibst, Robby

doi:10.1002/pip.3107

Title: Back-contacted bottom cells with three terminals: Maximizing power extraction from current-mismatched tandem cells

Journal Article · 06 February 2019 · Progress in Photovoltaics

DOI: https://doi.org/10.1002/pip.3107 · OSTI ID:1503161

^[1];

^[2]; Schnabel, Manuel ^[2]; Schulte‐Huxel, Henning ^[3]; Niepelt, Raphael ^[4]; Brendel, Rolf ^[1]; Stradins, Pauls ^[2]; Tamboli, Adele C. ^[2]; Peibst, Robby ^[1]

Inst. for Solar Energy Research Hamelin (ISFH), Emmerthal (Germany); Leibniz Univ. Hannover, Hannover (Germany)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Inst. for Solar Energy Research Hamelin (ISFH), Emmerthal (Germany)
Institute for Solar Energy Research Hamelin (ISFH) Emmerthal Germany

Multi-junction cells can significantly improve the energy yield of photovoltaic systems over a single-junction cell. The internal interconnection scheme of the subcells is an important aspect in determining the resulting levelized cost of electricity. For a dual-junction cell, two approaches are commonly discussed: series-connected tandem cells with two terminals or independently working subcells in a four-terminal (4T) tandem device. In this paper, we explore the working principle and the operation modes of a third, rarely discussed option: a three-terminal (3T) tandem cell using a back-contacted bottom cell with 3Ts. We use current-voltage measurements of illuminated 3T interdigitated back contact cells and confirm that the front and rear base contacts are at similar quasi-Fermi level positions, which enables the bottom cell to either efficiently collect surplus carriers, in the case of a current-limiting or carrier injecting top cell, or inject majority carriers, in the case of a current-limiting bottom cell. As a result, no current matching is needed. The power output of an idealized 3T bottom cell without resistive effects is independent of the current density applied from the top cell. These characteristics of the 3T bottom cells enable a 3T tandem to operate as efficiently as a 4T tandem, while being compatible with monolithic design and not requiring intermediate grids. We propose a simple equivalent circuit model including additional resistive effects, which describes a real 3T bottom cell and achieves excellent agreement to the experiment. We deduce design guidelines for a 3T bottom cell in different operation regimes.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Renewable Energy. Solar Energy Technologies Office

Grant/Contract Number:: AC36-08GO28308; AC36‐08GO28308

OSTI ID:: 1503161

Alternate ID(s):: OSTI ID: 1493641

Report Number(s):: NREL/JA-5900-71667

Journal Information:: Progress in Photovoltaics, Vol. 27, Issue 5; ISSN 1062-7995

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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interdigitated back contact cell (IBC)
tandem solar cell
three terminal

Title: Back-contacted bottom cells with three terminals: Maximizing power extraction from current-mismatched tandem cells

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