Controlled growth of PbI₂ nanoplates for rapid preparation of CH₃NH₃PbI₃ in planar perovskite solar cells (Phys. Status Solidi A 12∕2015).

Fu, Fan; Kranz, Lukas; Yoon, Songhak; Löckinger, Johannes; Jäger, Timo; Perrenoud, Julian; Feurer, Thomas; Gretener, Christina; Buecheler, Stephan; Tiwari, Ayodhya N.

Hybrid organic‐inorganic perovskites (general formula CH3NH3PbX3, X = Cl, Br, or I) solar cells have emerged as a highly competitive photovoltaic technology due to the high efficiency, easy processing and potentially low cost. Although the power conversion efficiency of perovskite solar cells employing mesoscopic scaffold has reached 20.1%, the planar devices have also drawn increasing attention due to the simple structure. Absorbers for planar perovskite solar cells are often prepared by two‐step deposition methods, where a thick compact PbI2 layer is deposited followed by conversion to perovskite using CH3NH3I solution. The surface of the precursor layer quickly reacts with the CH3NH3I solution, which hinders further diffusion of CH3NH3I into the layer, consequently leading to significant amounts of residual PbI2 at room temperature. Here, Fan Fu et al. (pp. 2708–2717) employ a porous nanostructured PbI2 layer consisting of nanoplates to rapidly prepare single phase perovskite at room temperature. These results have beneficial implications for rapid preparation of other 2D and 3D organic‐inorganic hybrid perovskites by rational tailoring the metal halide morphology.

LEAD iodide; PEROVSKITE; SOLAR cells

Physica Status Solidi. A: Applications & Materials Science, 2015, Vol 212, Issue 12, pn/a

1862-6300

Academic Journal

10.1002/pssa.201570478