English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The family of hybrid organic-inorganic lead-halide perovskites are thesubject of intense interest for optoelectronic applications, fromlight-emitting diodes to photovoltaics to X-ray detectors. Due to the inertnature of most organic molecules, the inorganic sublattice generally dominatesthe electronic structure and therefore optoelectronic properties ofperovskites. Here, we use optically and electronically active carbazole-basedCz-Ci molecules, where Ci indicates an alkylammonium chain and i indicates thenumber of CH2 units in the chain, varying from 3-5, as cations in the 2Dperovskite structure. By investigating the photophysics and charge transportcharacteristics of (Cz-Ci)2PbI4, we demonstrate a tunable electronic couplingbetween the inorganic lead-halide and organic layers. The strongest interlayerelectronic coupling was found for (Cz-C3)2PbI4, where photothermal deflectionspectroscopy results remarkably demonstrate an organic-inorganic chargetransfer state. Ultrafast transient absorption spectroscopy measurementsdemonstrate ultrafast hole transfer from the photoexcited lead-halide layer tothe Cz-Ci molecules, the efficiency of which increases by varying the chainlength from i=5 to i=3. The charge transfer results in long-lived carriers(10-100 ns) and quenched emission, in stark contrast with the fast (sub-ns) andefficient radiative decay of bound excitons in the more conventional 2Dperovskite (PEA)2PbI4, in which phenylethylammonium (PEA) acts as an inertspacer. Electrical charge transport measurements further support enhancedinterlayer coupling, showing increased out-of-plane carrier mobility from i=5to i=3. This study paves the way for the rational design of 2D perovskites withcombined inorganic-organic electronic proper-ties through the wide range offunctionalities available in the world of organics.

Tailoring Interlayer Charge Transfer Dynamics in 2D Perovskites with Electroactive Spacer Molecules