Vacuum-Deposited 2D/3D Perovskite Heterojunctions,ACS Energy Letters

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Vacuum-Deposited 2D/3D Perovskite Heterojunctions
ACS Energy Letters ( IF 19.3 ) Pub Date : 2019-11-11 , DOI: 10.1021/acsenergylett.9b02224
Maria-Grazia La-Placa ₁ , Lidón Gil-Escrig ₂ , Dengyang Guo ₃ , Francisco Palazon ₁ , Tom J. Savenije ₃ , Michele Sessolo ₁ , Henk J. Bolink ₁

Affiliation

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).

中文翻译：

真空沉积2D / 3D钙钛矿异质结

为了增强钙钛矿太阳能电池的稳定性和开路电压，正在对低维（准）二维钙钛矿进行广泛研究。迄今为止，仅通过固溶处理就已经在表面和/或3D钙钛矿的晶界处沉积了2D钙钛矿薄层，这导致了两相之间不可避免的混合。在这项工作中，我们报告了通过双源真空沉积法制备2D / 3D / 2D钙钛矿异质结构的目的，旨在研究3D和2D相之间的相互作用以及2D /纯净时2D钙钛矿的电荷输运性质。 3D接口。与在固溶处理的3D / 2D系统中通常观察到的情况不同，我们发现尽管开路电压较大，但电荷传输减少，没有直接的表面钝化迹象。

更新日期：2019-11-13

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