Interfacial Charge Transfer Influences Thin-Film Polymorphism

Calcinelli, Fabio; Jeindl, Andreas; Hörmann, Lukas; Ghan, Simiam; Oberhofer, Harald; Hofmann, Oliver

doi:10.1021/acs.jpcc.1c09986

Cited by 1 publication

(2 citation statements)

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“…[13][14][15][16] Therefore, designing the interface is a core problem in thin film technology, whose capability of controlling and engineering the molecular layers of a material on a substrate may certainly lead to design the optimal physical properties for each specific application. [17] Bulk and thin films of a compound both share the potential to display different crystal forms. However, unlike bulk polymorphs, whose structures are determined by their different molecular packing, thin film structures depend very much on the molecular organization of the organic layers on the surface, which may, or may not, lead to an ordered structure, depending on the nature of the interface and on the growth conditions.…”

Section: Introductionmentioning

confidence: 99%

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A New Approach to Polymorphism in Molecular Crystals: Substrate‐Mediated Structures Revealed by Lattice Phonon Dynamics

Salzillo

Brillante

2022

Adv Materials Inter

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The experimental search for polymorph screening is often assisted by computational studies on crystal structure predictions. [8] Lastly, a subtle perspective of Bernstein cleared up a final revision of the terminology and of the nomenclature of multiple crystal forms. [9] In more recent years a new approach to polymorphism has taken momentum in the search of new crystal structures of organic materials, the so-called thin film structures or substrate-induced polymorphs (SIP), meaning a phase grown in the vicinity of a substrate with a distinct structure from those of the bulk. [10] An earlier discussion on the subject was held in a dedicated workshop about fifteen years ago. [11] At that time the discussion was mostly focused on organic semiconductors such as pentacene and perylene diimide derivatives. Since the majority of the thin film structures showed crystal parameters not very dissimilar from those of the corresponding parent bulk forms, these structures were indicated as "distortedbulk," where the term "distorted" was ascribed to the perturbation of the substrate on the molecular layers. Approximately ten years later, [12] a new grammar on substrate-induced structures was established. The growth at the interface of a variety of different substrates led to the definition of the general class of surface-mediated structures, portraying more detailed definitions such as "surface-induced" and "surface-selected" polymorphs, with the former indicating a bulk-distorted form and the latter being a new genuine structure with no association to any crystal phase of the bulk. This is the nomenclature that we shall initially follow in the present survey, with some new hints on additional cases that will be encountered, such as substratestabilized polymorphs, as detailed further on.Certainly, the starting point of surface-mediated polymorphs cannot be separated by the exhaustive review on SIP as discussed in Jones et al. [10] In that paper, examples of sixteen molecules were given, for which thin film polymorphs had been observed on solid substrates, showing new structures with respect to the previously known single crystals polymorphs. The impact of polymorphism on the material properties was mostly addressed on organic electronics, because every structure has its own mobility with relevant consequences on the efficiency of the device. Besides, it is wellThe issue of polymorphism in molecular crystals is discussed, taking into account the substrate-mediated structures, that is, structures grown at the interface of different substrates. Bulk and thin films of a compound both share the potentiality to display different crystal forms. However, unlike bulk polymorphs, whose structures are determined by their different molecular packing, thin film structures depend very much on the molecular organization of the organic layers on the substrate, which may, or may not, lead to an ordered structure, depending on the nature of the interface and on the growth conditions. Based on large part in some of the authors' recent works, the...

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Section: Introductionmentioning

confidence: 99%

“…[ 13–16 ] Therefore, designing the interface is a core problem in thin film technology, whose capability of controlling and engineering the molecular layers of a material on a substrate may certainly lead to design the optimal physical properties for each specific application. [ 17 ]…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Polymorphism in Molecular Crystals: Substrate‐Mediated Structures Revealed by Lattice Phonon Dynamics

Salzillo

Brillante

2022

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

Interfacial Charge Transfer Influences Thin-Film Polymorphism

Cited by 1 publication

References 82 publications

A New Approach to Polymorphism in Molecular Crystals: Substrate‐Mediated Structures Revealed by Lattice Phonon Dynamics

A New Approach to Polymorphism in Molecular Crystals: Substrate‐Mediated Structures Revealed by Lattice Phonon Dynamics

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