Monolithic Two-Terminal Perovskite/CIS Tandem Solar Cells with Efficiency Approaching 25%
article
Monolithic two-terminal (2T) perovskite/CuInSe2 (CIS) tandem solar cells (TSCs) combine the promise of an efficient tandem photovoltaic (PV) technology with the simplicity of an all-thin-film device architecture that is compatible with flexible and lightweight PV. In this work, we present the first-ever 2T perovskite/CIS TSC with a power conversion efficiency (PCE) approaching 25% (23.5% certified, area 0.5 cm2). The relatively planar surface profile and narrow band gap (∼1.03 eV) of our CIS bottom cell allow us to exploit the optoelectronic properties and photostability of a low-Br-containing perovskite top cell as revealed by advanced characterization techniques. Current matching was attained by proper tuning of the thickness and bandgap of the perovskite, along with the optimization of an antireflective coating for improved light in-coupling. Our study sets the baseline for fabricating efficient perovskite/CIS TSCs, paving the way for future developments that might push the efficiencies to over 30%.
Topics
Electrical conductivityLayers,PerovskitesPower conversion efficiencySolar cellsAntireflection coatingsCopper compoundsEfficiencyEnergy gapIndium compoundsPerovskite solar cellsSelenium compoundsSolar power generationThin film devicesThin film solar cellsCuInSe2Device architecturesMonolithicsPhotovoltaic technologyPhotovoltaicsPlanar surfacePower conversion efficienciesTandem solar cellsThin-film devicesTwo terminals
TNO Identifier
980712
ISSN
23808195
Source
ACS Energy Letters, 7(7), pp. 2273-2281.
Publisher
American Chemical Society
Pages
2273-2281