Preparation of Single-Phase Films of CH3NH3Pb(I1–x Br x )3 with Sharp Optical Band Edges

• Published in: The journal of physical chemistry letters Vol. 5; no. 15; pp. 2501 - 2505
• Main Authors: Sadhanala, Aditya, Deschler, Felix, Thomas, Tudor H, Dutton, Siân E, Goedel, Karl C, Hanusch, Fabian C, Lai, May L, Steiner, Ullrich, Bein, Thomas, Docampo, Pablo, Cahen, David, Friend, Richard H
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 07.08.2014
• Subjects: Energy Conversion and Storage; Energy and Charge Transport; iodide-bromide perovskite; organometallic lead halide perovskite; Urbach energy; PDS

Organometallic lead-halide perovskite-based solar cells now approach 18% efficiency. Introducing a mixture of bromide and iodide in the halide composition allows tuning of the optical bandgap. We prepare mixed bromide–iodide lead perovskite films CH3NH3Pb­(I1–x Br x )3 (0 ≤ x ≤ 1) by spin-coating fr...