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Monolithic CIGS–Perovskite Tandem Cell for Optimal Light Harvesting without Current Matching
journal contribution
posted on 2017-03-22, 18:33 authored by Paola Mantilla-Perez, Thomas Feurer, Juan-Pablo Correa-Baena, Quan Liu, Silvia Colodrero, Johann Toudert, Michael Saliba, Stephan Buecheler, Anders Hagfeldt, Ayodhya N. Tiwari, Jordi MartorellWe present a novel
monolithic architecture for optimal light harvesting
in multijunction thin film solar cells. In the configuration we consider,
formed by a perovskite (PVK) cell overlying a CIGS cell, the current
extracted from the two different junctions is decoupled by the insertion
of a dielectric nonperiodic photonic multilayer structure. This photonic
multilayer is designed by an inverse integration approach to confine
the incident sunlight above the PVK band gap in the PVK absorber layer,
while increasing the transparency for sunlight below the PVK band
gap for an efficient coupling into the CIGS bottom cell. To match
the maximum power point voltages in a parallel connection of the PVK
and CIGS cells, the latter is divided into two subcells by means of
a standard three-laser scribing connection. Using realistic parameters
for all the layers in the multijunction architecture we predict power
conversion efficiencies of 28%. This represents an improvement of
24% and 26% over the best CIGS and PVK single-junction cells, respectively,
while at the same time outperforms the corresponding current-matched
standard tandem configuration by more than two percentage points.
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power conversion efficienciesPVK band gapPVK absorber layertandem configurationPVK single-junction cellsdielectric nonperiodic photonicmultijunction architectureincident sunlightpower point voltagesCIGS cellsintegration approachlight harvestingCIGS cellpercentage pointsthree-laser scribing connectionCIGS bottom cellOptimal Light Harvesting
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