%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