Efficient Photo- and Electroluminescence by Trap States Passivation in Vacuum-Deposited Hybrid Perovskite Thin Films

Dänekamp, Benedikt; Droseros, Nikolaos; Palazon, Francisco; Sessolo, Michele; Banerji, Natalie; Bolink, Henk J. (2018). Efficient Photo- and Electroluminescence by Trap States Passivation in Vacuum-Deposited Hybrid Perovskite Thin Films. ACS applied materials & interfaces, 10(42), pp. 36187-36193. American Chemical Society 10.1021/acsami.8b13100

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Methylammonium lead iodide (MAPI) has excellent properties for photovoltaic applications, although it typically shows low photoluminescence quantum yield. Here, we report on vacuum-deposited MAPI perovskites obtained by modifying the methylammonium iodide (MAI) to PbI2 ratio during vacuum deposition. By studying the excitation density dependence of the photoluminescence lifetime, a large concentration of trap states was deduced for the stoichiometric MAPI films. The use of excess MAI during vacuum processing is capable of passivating these traps, resulting in luminescent films which can be used to fabricate planar light-emitting diodes with quantum efficiency approaching 2%.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Droseros, Nikolaos and Banerji, Natalie

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry
500 Science > 530 Physics

ISSN:

1944-8252

Publisher:

American Chemical Society

Language:

English

Submitter:

Gareth John Moore

Date Deposited:

07 Dec 2018 12:48

Last Modified:

07 Dec 2018 12:48

Publisher DOI:

10.1021/acsami.8b13100

BORIS DOI:

10.7892/boris.121526

URI:

https://boris.unibe.ch/id/eprint/121526

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