Tae-Youl Yang

TL;DR: Jeon et al. as discussed by the authors synthesize a fluorene-terminated hole-transporting material with a fine-tuned energy level and a high glass transition temperature to ensure highly efficient and thermally stable perovskite solar cells.

TL;DR: A double-layered halide architecture for perovskite solar cells enables the use of dopant-free poly(3-hexylthiophene) as a hole-transport material, forming stable and scalable devices with a certified power conversion efficiency of 22.7 per cent.

TL;DR: This work shows that the goal of extending the optical-absorption onset of perovskite-based photovoltaics further into the red to enhance solar-light harvesting can be reached by using a mixture of formamidinium and methylammonium cations, which leads to an enhanced short-circuit current and thus superior devices to those based on only CH3 NH3 (+).

TL;DR: It is shown that methylammonium (but also formamidinium) iodoplumbates are mixed conductors with a large fraction of ion conduction because of iodine ions, providing insight into electrical charge transport in the hybrid organic-inorganic lead halide solar cells as well as into new possibilities of improving the photovoltaic performance by controlling the ionic disorder.

TL;DR: Light excitation enhances by several orders of magnitude the ionic conductivity of methylammonium lead iodide, the archetypal metal halide photovoltaic material, and straightforwardly leads to a hitherto unconsidered photodecomposition path of the perovskite.