6533b838fe1ef96bd12a4718
RESEARCH PRODUCT
Vacuum-Deposited 2D/3D Perovskite Heterojunctions
Lidón Gil-escrigTom J. SavenijeMaria-grazia La-placaFrancisco PalazonHenk J. BolinkMichele SessoloDengyang Guosubject
Materials scienceRenewable Energy Sustainability and the Environmentbusiness.industryEnergy Engineering and Power TechnologyHeterojunction02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesFuel TechnologySemiconductorsChemistry (miscellaneous)Materials ChemistryOptoelectronics0210 nano-technologybusinessMaterialsPerovskite (structure)Voltagedescription
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).
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-11-05 |