Charge‐Carrier Dynamics and Mobilities in Formamidinium Lead Mixed‐Halide Perovskites. (24th September 2015)

• Record Type: Journal Article
• Authors: Rehman, Waqaas; Milot, Rebecca L.; Eperon, Giles E.; Wehrenfennig, Christian; Boland, Jessica L.; Snaith, Henry J.; Johnston, Michael B.; Herz, Laura M.
• Is Part Of: Advanced materials. Volume 27:Number 48(2015)
• Page Start: 7938
• Page End: 7944
• Publication Date: 2015-09-24
• Subjects: charge‐carrier recombination -- charge diffusion length -- perovskite solar cells -- phase disorder -- photovoltaics; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201502969
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract : The mixed‐halide perovskite FAPb(Br y I1– y )3 is attractive for color‐tunable and tandem solar cells. Bimolecular and Auger charge‐carrier recombination rate constants strongly correlate with the Br content, y, suggesting a link with electronic structure. FAPbBr3 and FAPbI3 exhibit charge‐carrier mobilities of 14 and 27 cm 2 V −1 s −1 and diffusion lengths exceeding 1 μm, while mobilities across the mixed Br/I system depend on crystalline phase disorder.