%0 Journal Article %A Chirvony, Vladimir S. %A Sekerbayev, Kairolla S. %A Pérez-del-Rey, Daniel %A Martínez-Pastor, Juan P. %A Palazon, Francisco %A Boix, Pablo P. %A Taurbayev, Toktar I. %A Sessolo, Michele %A Bolink, Henk J. %D 2019 %T Short Photoluminescence Lifetimes in Vacuum-Deposited CH3NH3PbI3 Perovskite Thin Films as a Result of Fast Diffusion of Photogenerated Charge Carriers %U https://acs.figshare.com/articles/journal_contribution/Short_Photoluminescence_Lifetimes_in_Vacuum-Deposited_CH_sub_3_sub_NH_sub_3_sub_PbI_sub_3_sub_Perovskite_Thin_Films_as_a_Result_of_Fast_Diffusion_of_Photogenerated_Charge_Carriers/9709058 %R 10.1021/acs.jpclett.9b02329.s001 %2 https://acs.figshare.com/ndownloader/files/17398106 %K charge diffusion length %K cm %K power conversion efficiency %K surface %K lifetime %K PCE %K Photogenerated Charge Carriers %K eMAPI %K D values %K PL %K Short Photoluminescence Lifetimes %K diffusion coefficient D %K metal halide perovskite films %K vacuum-evaporated CH 3 NH 3 PbI 3 %K Vacuum-Deposited CH 3 NH 3 PbI 3 Perovskite %X It is widely accepted that a long photoluminescence (PL) lifetime in metal halide perovskite films is a crucial and favorable factor, as it ensures a large charge diffusion length leading to a high power conversion efficiency (PCE) in solar cells. It has been recently found that vacuum-evaporated CH3NH3PbI3 (eMAPI) films show very short PL lifetimes of several nanoseconds. The corresponding solar cells, however, have high photovoltage (>1.1 V) and PCEs (up to 20%). We rationalize this apparent contradiction and show that eMAPI films are characterized by a very high diffusion coefficient D, estimated from modeling the PL kinetics to exceed 1 cm2/s. Such high D values are favorable for long diffusion length as well as fast transport of carriers to film surfaces, where they recombine nonradiatively with surface recombination velocity S ∼ 104 cm/s. Possible physical origins leading to the high D values are also discussed. %I ACS Publications