MilliporeSigma
  • Home
  • Search Results
  • Perovskite Solar Cells with Large-Area CVD-Graphene for Tandem Solar Cells.

Perovskite Solar Cells with Large-Area CVD-Graphene for Tandem Solar Cells.

The journal of physical chemistry letters (2015-08-13)
Felix Lang, Marc A Gluba, Steve Albrecht, Jörg Rappich, Lars Korte, Bernd Rech, Norbert H Nickel
ABSTRACT

Perovskite solar cells with transparent contacts may be used to compensate for thermalization losses of silicon solar cells in tandem devices. This offers a way to outreach stagnating efficiencies. However, perovskite top cells in tandem structures require contact layers with high electrical conductivity and optimal transparency. We address this challenge by implementing large-area graphene grown by chemical vapor deposition as a highly transparent electrode in perovskite solar cells, leading to identical charge collection efficiencies. Electrical performance of solar cells with a graphene-based contact reached those of solar cells with standard gold contacts. The optical transmission by far exceeds that of reference devices and amounts to 64.3% below the perovskite band gap. Finally, we demonstrate a four-terminal tandem device combining a high band gap graphene-contacted perovskite top solar cell (Eg = 1.6 eV) with an amorphous/crystalline silicon bottom solar cell (Eg = 1.12 eV).

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Acetonitrile solution, contains 10.0% acetone, 40.0% 2-propanol, 0.05% formic acid
Sigma-Aldrich
Methylamine solution, 33 wt. % in absolute ethanol ((denatured with 1% toluene))
Sigma-Aldrich
Acetonitrile solution, contains 0.05 % (v/v) trifluoroacetic acid
Sigma-Aldrich
Acetonitrile solution, contains 0.1 % (v/v) trifluoroacetic acid, suitable for HPLC
Sigma-Aldrich
Methylamine solution, 2.0 M in THF
Sigma-Aldrich
Methylamine solution, 2.0 M in methanol
Sigma-Aldrich
Acetonitrile solution, contains 0.1 % (v/v) formic acid, suitable for HPLC
Sigma-Aldrich
Acetonitrile solution, contains 0.05 % (w/v) ammonium formate, 0.1 % (v/v) formic acid, 5 % (v/v) water, suitable for HPLC
Sigma-Aldrich
4-tert-Butylpyridine, 98%
Sigma-Aldrich
Titanium diisopropoxide bis(acetylacetonate), 75 wt. % in isopropanol
Supelco
Acetonitrile, HPLC grade, ≥99.93%
Sigma-Aldrich
Acetonitrile, ≥99.5%, ACS reagent
Sigma-Aldrich
Acetonitrile, anhydrous, 99.8%
Sigma-Aldrich
Acetonitrile, HPLC Plus, ≥99.9%, poly-coated bottles
Sigma-Aldrich
Acetonitrile, electronic grade, 99.999% trace metals basis
Sigma-Aldrich
Acetonitrile