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

• Record Type: Journal Article
• Authors: Fu, Fan; Kranz, Lukas; Yoon, Songhak; Löckinger, Johannes; Jäger, Timo; Perrenoud, Julian; Feurer, Thomas; Gretener, Christina; Buecheler, Stephan; Tiwari, Ayodhya N.
• Is Part Of: Physica status solidi. Volume 212:Issue 12(2015:Dec.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2015-12
• Subjects: Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201570478
• Languages: English
• ISSNs: 1862-6300

Abstract

Abstract : Hybrid organic‐inorganic perovskites (general formula CH3 NH3 Pb X 3, 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 CH3 NH3 I solution. The surface of the precursor layer quickly reacts with the CH3 NH3 I solution, which hinders further diffusion of CH3 NH3 I 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.