Direct Conversion of Perovskite Thin Films into Nanowires with Kinetic Control for Flexible Optoelectronic Devices

Abstract

With significant progress in the past decade, semiconductor nanowires have demonstrated unique features compared to their thin film counterparts, such as enhanced light absorption, mechanical integrity and reduced therma conductivity, etc. However, technologies of semiconductor thin film still serve as foundations of several major industries, such as electronics, displays, energy, etc. A direct path to convert thin film to nanowires can build a bridge between these two and therefore facilitate the large-scale applications of nanowires. Here, we demonstrate that methylammonium lead iodide (CH 3 NH 3 PbI 3 ) nanowires can be synthesized directly from perovskite film by a scalable conversion process. In addition, with fine kinetic control, morphologies, and diameters of these nanowires can be well-controlled. Based on these perovskite nanowires with excellent optical trapping and mechanical properties, flexible photodetectors with good sensitivity are demonstrated.

Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

“…Several fabrication techniques have been developed for the growth of organic-− inorganic perovskite nanowires (NWs) directly 58 Yuan et al 59 reported deep blue-luminescent layered lead bromide perovskite microdisks, a few micrometers in size laterally and 15-100 nm-thick with a PLQY reaching 50%. The same group also reported nanoscale quasi-2D layered perovskites with tunable emissions from 403 to 530 nm by changing the organic cations used.…”

Bandgap tunable Csx(CH3NH3)1−xPbI3perovskite nanowires by aqueous solution synthesis for optoelectronic devices

“…Hybrid perovskites have attracted great interest due to their tunable bandgaps and superior energy conversion properties. The bangap tuning were generally implemented by changing the composition by halogen anion [10][11][12][13][14] or cation [15][16][17] Nowadays, the synthesis methods of perovskite NWs were ascribed to solvent evaporation assisted self-assembly method [19][20][21][22][23][24] . And most reports utilized organic polar solvent such as N, N-dimethyformamide (DMF), dimethyl sulfoxide(DMSO) in solution method.…”

Low‐dimensional metal halide perovskites and related optoelectronic applications

“…A thin saturated solution film of MAPbI 3 in DMF was confined by two glass slides, and the nanowires came into crystallization while gradually sliding the upper glass to expose the liquid to air. It was assumed that the nanowire growth was due to the directional effect of DMF that an internal complex with the methylamine group was formed during the crystallization process . A great breakthrough in halide perovskite nanowire synthesis was put forward by Fu et al (Figure J) They proposed a dissolution‐recrystallization model to grow single‐crystalline MAPbI 3 nanowires.…”

“…The inset is the photograph of the flexible detector. Reproduced with permission . Copyright 2016 American Chemical Society.…”