公开(公告)号：US20170102332A1

公开(公告)日：2017-04-13

申请号：US15128149

申请日：2015-03-23

Applicant: Drexel University ,  The Trustees Of The University of Pennsylvania

Inventor： Jonathan E. SPANIER ,  Zongquan GU ,  Mohammad A. ISLAM ,  Diomedes SALDANA-GRECO ,  Andrew Marshall RAPPE

IPC: G01N21/64 ,  G01N21/76

CPC classification number: G01N21/6489

Abstract: The present disclosure pertains to the use of intense, narrow-linewidth surface, chemically-switchable ultraviolet photoluminescence from radiative recombination of the two-dimensional electron liquid with photo-excited holes in complex oxide heterostructures, such as LaAlO3/SrTiO3 (LAO/STO). Such photoluminescence from the interface between the upper and lower layers can be suppressed and restored reversibly under oxidizing and reducing conditions, respectively, as induced by chemisorption and reversal of chemisorption on the exposed surface of the heterostructure's upper member. Making use of this chemically-switchable ultraviolet photoluminescence, the present disclosure provides, inter alia, systems for detection of a chemical species, methods for determining the absence or presence of a chemical species in a sample, optoelectronic devices, and methods for producing optoelectronic devices.

公开(公告)号：US20200240000A1

公开(公告)日：2020-07-30

申请号：US16756337

申请日：2018-10-09

Applicant: Drexel University

Inventor： Zongquan GU ,  Babak ANASORI ,  Andrew Lewis BENNETT-JACKSON ,  Matthias FALMBIGL ,  Dominic IMBRENDA ,  Yury GOGOTSI ,  Jonathan E. SPANIER

IPC: C23C14/08 ,  C23C16/40 ,  C23C14/58 ,  C23C16/455 ,  C23C16/56 ,  H01L49/02 ,  C23C16/32 ,  C23C14/06 ,  C23C16/02 ,  C23C14/02

Abstract: The present disclosure is directed to using MXene compositions as templates for the deposition of oriented perovskite films, and compositions derived from such methods. Certain specific embodiments include methods preparing an oriented perovskite, perovskite-type, or perovskite-like film, the methods comprising: (a) depositing at least one perovskite, perovskite-type, or perovskite-like composition or precursor composition using chemical vapor deposition (CVD), physical vapor deposition (PVD), or atomic layer deposition (ALD) onto a film or layer of a MXene composition supported on a substrate to form a layered composition or precursor composition; and either (b) (1) heat treating or annealing the layered precursor composition to form a layered perovskite-type structure comprising at least one oriented perovskite, perovskite-type, or perovskite-like composition; or (2) annealing the layered composition; or (3) both (1) and (2).