Layer-edge device of two-dimensional hybrid perovskites

Bin Cheng,Ting-You Li,Kang-Ting Ho,Jun Yin,Omar F Mohammed,Jr-Hau He,José Ramón Durán Retamal,Pai-Chun Wei

doi:10.1038/s41467-018-07656-2

Bin Cheng, Ting-You Li + Show 6 more

Open Access

https://doi.org/10.1038/s41467-018-07656-2

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Abstract

Two dimensional layered organic-inorganic hybrid perovskites (2D perovskites) are potential candidates for next generation photovoltaic device. Especially, the out-of-plane surface perpendicular to the superlattice plane of 2D perovskites (layer-edge surface) has presented several exotic behaviors, such as layer-edge states which are found to be crucial for improving the efficiency of 2D perovskite solar cells. However, fundamental research on transport properties of layer-edge surface is still absent. In this report, we observe the electronic and opto-electronic behavior in layer-edge device of 2D perovskites. The dark and photo currents are demonstrated to strongly depend on the crystallographic orientation in layer-edge device, and such anisotropic properties, together with photo response, are related to the thickness of inorganic layers. Finally, due to the abundant hydroxyl groups, water molecules are easy to condense on the layer-edge surface, and the conductance is extremely sensitive to the humidity environment, indicating a potential application of humidity sensor.

Highlights

Two dimensional layered organic-inorganic hybrid perovskites (2D perovskites) are potential candidates for generation photovoltaic device
In the two-dimensional-layeredorganic–inorganic hybrid perovskites (2D perovskites), the outof-plane surface perpendicular to the superlattice plane, which is named as layer-edge surface, has unique organic–inorganic staggered superlattice pattern, as a straightforward result of multiple quantum well structures
Strong anisotropic electronic/opto-electronic properties are demonstrated, caused by the organic/inorganic layer staggered multiple quantum well structures. Such anisotropy is decreased as the thickness of inorganic layer increases

Summary

Introduction

Two dimensional layered organic-inorganic hybrid perovskites (2D perovskites) are potential candidates for generation photovoltaic device. Transport measurements are performed in these layer-edge devices of 2D perovskites, showing highly anisotropic electrical and opto-electronic conductance. In order to fabricate the layer-edge device, 2D perovskite single crystal with large enough layer-edge surface is required.

Results

Conclusion