Title
Monolithic Two-Terminal Perovskite/CIS Tandem Solar Cells with Efficiency Approaching 25%
Author
Ruiz-Preciado, M.A.
Gota, F.
Fassl, P.
Hossain, I.M.
Singh, R.
Laufer, F.
Schackmar, F.
Feeney, T.
Farag, A.
Allegro, I.
Hu, H.
Gharibzadeh, S.
Nejand, B.A.
Gevaerts, V.S.
Simor, M.
Bolt, P.J.
Paetzold, U.W.
Publication year
2022
Abstract
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%.
Subject
Electrical conductivity
Layers,Perovskites
Power conversion efficiency
Solar cells
Antireflection coatings
Copper compounds
Efficiency
Energy gap
Indium compounds
Perovskite solar cells
Selenium compounds
Solar power generation
Thin film devices
Thin film solar cells
CuInSe2
Device architectures
Monolithics
Photovoltaic technology
Photovoltaics
Planar surface
Power conversion efficiencies
Tandem solar cells
Thin-film devices
Two terminals
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DOI
https://doi.org/10.1021/acsenergylett.2c00707
TNO identifier
980712
Publisher
American Chemical Society
ISSN
2380-8195
Source
ACS Energy Letters, 7 (7), 2273-2281
Document type
article