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Short photoluminescence lifetimes in vacuum-deposited ch3nh3pbI3 perovskite thin films as a result of fast diffusion of photogenerated charge carriers

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Short photoluminescence lifetimes in vacuum-deposited ch3nh3pbI3 perovskite thin films as a result of fast diffusion of photogenerated charge carriers

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dc.contributor.author	Chirvony, Vladimir S.
dc.contributor.author	Sekerbayed, Kairolla S.
dc.contributor.author	Pérez-del-Rey, Daniel
dc.contributor.author	Martínez Pastor, Juan Pascual
dc.contributor.author	Palazón Huet, Francisco
dc.contributor.author	Boix, Pablo P.
dc.contributor.author	Taurbayev, Toktar I.
dc.contributor.author	Sessolo, Michele
dc.contributor.author	Bolink, Henk
dc.date.accessioned	2019-12-17T11:10:12Z
dc.date.available	2019-12-17T11:10:12Z
dc.date.issued	2019	es_ES
dc.identifier.uri	https://hdl.handle.net/10550/72455
dc.description.abstract	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 vacuumevaporated 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	en_US
dc.description.abstract	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 vacuumevaporated 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	es_ES
dc.language.iso	en	es_ES
dc.title	Short photoluminescence lifetimes in vacuum-deposited ch3nh3pbI3 perovskite thin films as a result of fast diffusion of photogenerated charge carriers	es_ES
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::QUÍMICA	es_ES
dc.identifier.doi	10.1021/acs.jpclett.9b02329	es_ES
dc.identifier.idgrec	134407