Vacuum-Deposited 2D/3D Perovskite Heterojunctions

Maria Grazia La-Placa, Lidón Gil-Escrig, Dengyang Guo, Francisco Palazon, Tom J. Savenije, Michele Sessolo, Henk J. Bolink

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

Low-dimensional (quasi-) 2D perovskites are being extensively studied in order to enhance the stability and the open-circuit voltage of perovskite solar cells. Up to now, thin 2D perovskite layers on the surface and/or at the grain boundaries of 3D perovskites have been deposited solely by solution processing, leading to unavoidable intermixing between the two phases. In this work, we report the fabrication of 2D/3D/2D perovskite heterostructures by dual-source vacuum deposition, with the aim of studying the interaction between the 3D and 2D phases as well as the charge transport properties of 2D perovskites in neat 2D/3D interfaces. Unlike what is normally observed in solution-processed 3D/2D systems, we found a reduced charge transport with no direct evidence of surface passivation, in spite of larger open-circuit voltage. This is likely due to a nonfavorable orientation of the 2D perovskite with respect to methylammonium lead iodide and to the formation of 2D phases with very low dimensionality (pure 2D).

Original languageEnglish
Pages (from-to)2893-2901
JournalACS Energy Letters
Volume4
Issue number12
DOIs
Publication statusPublished - 2019

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