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Instruments / Technical Area	Publication Details	Published	Actions
I07-Surface & interface diffraction	Controlling the growth kinetics and optoelectronic properties of 2D/3D lead–tin perovskite heterojunctions Edoardo Ruggeri , Miguel Anaya , Krzysztof Galkowski , Geraud Delport , Felix Utama Kosasih , Anna Abfalterer , Sebastian Mackowski , Caterina Ducati , Samuel D. Stranks Advanced Materials DOI: 10.1002/adma.201905247 Diamond Proposal Number(s): [17223] Open Access Show Abstract ▼ Abstract: Halide perovskites are emerging as valid alternatives to conventional photovoltaic active materials owing to their low cost and high device performances. This material family also shows exceptional tunability of properties by varying chemical components, crystal structure, and dimensionality, providing a unique set of building blocks for new structures. Here, highly stable self‐assembled lead–tin perovskite heterostructures formed between low‐bandgap 3D and higher‐bandgap 2D components are demonstrated. A combination of surface‐sensitive X‐ray diffraction, spatially resolved photoluminescence, and electron microscopy measurements is used to reveal that microstructural heterojunctions form between high‐bandgap 2D surface crystallites and lower‐bandgap 3D domains. Furthermore, in situ X‐ray diffraction measurements are used during film formation to show that an ammonium thiocyanate additive delays formation of the 3D component and thus provides a tunable lever to substantially increase the fraction of 2D surface crystallites. These novel heterostructures will find use in bottom cells for stable tandem photovoltaics with a surface 2D layer passivating the 3D material, or in energy‐transfer devices requiring controlled energy flow from localized surface crystallites to the bulk.	Nov 2019

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I07-Surface & interface diffraction

Controlling the growth kinetics and optoelectronic properties of 2D/3D lead–tin perovskite heterojunctions

Edoardo Ruggeri , Miguel Anaya , Krzysztof Galkowski , Geraud Delport , Felix Utama Kosasih , Anna Abfalterer , Sebastian Mackowski , Caterina Ducati , Samuel D. Stranks

Advanced Materials

DOI: 10.1002/adma.201905247

Diamond Proposal Number(s): [17223]