DataVXNature MaterialsPaper
journal article·2018-10

Molecularly thin two-dimensional hybrid perovskites with tunable optoelectronic properties due to reversible surface relaxation

Kai Leng, Ibrahim Abdelwahab, Ivan Verzhbitskiy, Mykola Telychko, Leiqiang Chu, Wei Fu, Xiao Chi, Na Guo, Zhihui Chen, Zhongxin Chen, Chun Zhang, Qing-Hua Xu, Jiong Lu, Manish Chhowalla, Goki Eda, Kian Ping Loh

Nature Materials· Volume 17· Issue 10
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Source abstract

Abstract

Due to their layered structure, two-dimensional Ruddlesden-Popper perovskites (RPPs), composed of multiple organic/inorganic quantum wells, can in principle be exfoliated down to few and single layers. These molecularly thin layers are expected to present unique properties with respect to the bulk counterpart, due to increased lattice deformations caused by interface strain. Here, we have synthesized centimetre-sized, pure-phase single-crystal RPP perovskites (CH3(CH2)3NH3)2(CH3NH3)n-1PbnI3n+1 (n = 1-4) from which single quantum well layers have been exfoliated. We observed a reversible shift in excitonic energies induced by laser annealing on exfoliated layers encapsulated by hexagonal boron nitride. Moreover, a highly efficient photodetector was fabricated using a molecularly thin n = 4 RPP crystal, showing a photogain of 105 and an internal quantum efficiency of ~34%. Our results suggest that, thanks to their dynamic structure, atomically thin perovskites enable an additional degree of control for the bandgap engineering of these materials.
Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

Electronic materialsMaterials processing

OpenAlex topics: Perovskite Materials and Applications · 2D Materials and Applications · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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