Response to Comment on “Spin coating epitaxial films”

Abstract

Lu and Tang claim that the spin-coated films in our study are not epitaxial. They assume that all of the background intensity in the x-ray pole figures of the spin-coated materials is due to randomly oriented grains. There is no evidence for randomly oriented grains in the 2θ x-ray patterns. The background intensity in the pole figures is also comparable to the background from the single-crystal substrates, which is inconsistent with their assumption.

In Situ Growth of All‐Inorganic Perovskite Single Crystal Arrays on Electron Transport Layer

“…The crystallization started at the edge and ended in the middle. According to the crystallographic principles, [ 33 ] the very thin supersaturated solution layer on the edge of the ZnO covered substrates initialized the nucleation from the spin‐coated solution. The lower thickness of the solution at the edge is caused by surface tension and causes a faster solvent evaporation rate at the edge as compared with the film center.…”

“…[ 32 ] Recently, single‐crystalline homo‐epitaxial perovskite thin films made by spin‐coating the precursors of the perovskite onto SrTiO 3 substrates were demonstrated, which provided a new approach for fabricating single‐crystalline perovskite materials. [ 33 ] Spin‐coating is a simple, rapid, and inexpensive approach that has been used commercially for device fabrication including depositing polymer films for lithography, unlike these techniques which are usually constrained to ultrahigh vacuum or high temperatures such as molecular beam epitaxy, chemical vapor deposition, and physical deposition. [ 33 ] However, single‐crystalline perovskite films grown on SrTiO 3 substrates were not convenient for the fabrication of optoelectronic devices in the typical configuration such as LEDs or solar cells.…”

“…[ 33 ] Spin‐coating is a simple, rapid, and inexpensive approach that has been used commercially for device fabrication including depositing polymer films for lithography, unlike these techniques which are usually constrained to ultrahigh vacuum or high temperatures such as molecular beam epitaxy, chemical vapor deposition, and physical deposition. [ 33 ] However, single‐crystalline perovskite films grown on SrTiO 3 substrates were not convenient for the fabrication of optoelectronic devices in the typical configuration such as LEDs or solar cells. The typical device configuration of such devices is commonly composed of an emitting layer of perovskite sandwiched between two transport layers connecting to the respective anode and cathode.…”

Solution‐Processable Epitaxial Metallic Delafossite Oxide Films

“…Solution processable routes as the paramount method in applications have been become more and more important in commercial deposition of thin films, possessing advantages of low‐cost, easy preparation for large size thin films, precise control of the stoichiometry, and facile fabrication of thin films on irregular substrates. [ 21,22 ] The successful achievements of metallic delafossite oxide thin films through solution routes will not only pave ways for investigations about unexplored land but also for potential technological applications. Here, a novel and facile solution route is developed to synthesize epitaxial metallic ABO 2 thin films, showing the ultra‐high room temperature electrical conductivity amongst oxide thin films.…”

Pyrolysis study of solution-derived superconducting YBa2Cu3O7films: disentangling the physico-chemical transformations

“…The growth of large area or long length functional and multifunctional thin films can be made through a very promising low cost approach: chemical solution deposition (CSD) which uses different types of chemical solutions as precursors. [1][2][3][4][5][6][7] The solutions can be deposited on substrates through several methodologies allowing to control the film thickness, such as spin coating, dip coating, web coating or ink jet printing (IJP). 8,9 Afterwards, to develop the functionality of the thin films, solution drying, pyrolysis and growth steps are required.…”