Stefaan De Wolf

TL;DR: Using highly sensitive photothermal deflection and photocurrent spectroscopy, the absorption spectrum of CH3NH3PbI3 perovskite thin films at room temperature is measured, finding a high absorption coefficient with particularly sharp onset and a compositional change of the material.

TL;DR: Silicon heterojunction solar cells as mentioned in this paper consist of thin amorphous silicon layers deposited on crystalline silicon wafers, which enables energy conversion efficiencies above 20% at the industrial production level.

TL;DR: In this article, the authors review the dynamic field of crystalline silicon photovoltaics from a device-engineering perspective and give an up-to-date summary of promising recent pathways for further efficiency improvements and cost reduction employing novel carrierselective passivating contact schemes, as well as tandem multi-junction architectures, in particular those that combine silicon absorbers with organic-inorganic perovskite materials.

TL;DR: The complex refractive index of planar CH3NH3PbI3 thin films at room temperature is investigated by variable angle spectroscopic ellipsometry and spectrophotometry and results agree well with previously reported data of the absorption coefficient and are consistent with Kramers-Kronig transformations.

TL;DR: Tandems that combine solution-processed micrometer-thick perovskite top cells with fully textured silicon heterojunction bottom cells are reported, which presents the possibility of overcoming the single-junction Shockley-Queisser limit in photovoltaics.