Southeast University

About: Southeast University is a education organization based out in Nanjing, China. It is known for research contribution in the topics: MIMO & Control theory. The organization has 66363 authors who have published 79434 publications receiving 1170576 citations. The organization is also known as: SEU.

Fabrication of Efficient Low-Bandgap Perovskite Solar Cells by Combining Formamidinium Tin Iodide with Methylammonium Lead Iodide.

Abstract: Mixed tin (Sn)–lead (Pb) perovskites with high Sn content exhibit low bandgaps suitable for fabricating the bottom cell of perovskite-based tandem solar cells. In this work, we report on the fabrication of efficient mixed Sn–Pb perovskite solar cells using precursors combining formamidinium tin iodide (FASnI3) and methylammonium lead iodide (MAPbI3). The best-performing cell fabricated using a (FASnI3)0.6(MAPbI3)0.4 absorber with an absorption edge of ∼1.2 eV achieved a power conversion efficiency (PCE) of 15.08 (15.00)% with an open-circuit voltage of 0.795 (0.799) V, a short-circuit current density of 26.86(26.82) mA/cm2, and a fill factor of 70.6(70.0)% when measured under forward (reverse) voltage scan. The average PCE of 50 cells we have fabricated is 14.39 ± 0.33%, indicating good reproducibility.

Recent progress in solution processable TADF materials for organic light-emitting diodes

Abstract: Solution processable organic light-emitting diodes (OLEDs) are drawing increasing attention due to their potential application in low-cost, large-area, solid-state lighting. Meanwhile, thermally activated delayed fluorescence (TADF) materials have undergone significant progress since TADF-OLEDs exhibit extraordinary performance, which have been given priority in newly developed OLED technologies. Combining these two technologies to construct solution processable TADF-OLEDs is a newly developed area. In this review, we will generalize the design strategy for solution processable TADF materials. The spin–orbit coupling matrix element will be discussed as a new approach for highly efficient TADF. Then we will review materials used in solution-processed TADF-OLEDs, including small molecules, polymers and dendrimers. Furthermore, the prospects and remaining problems in this area will be discussed at the end of the review.

Global stability conditions for delayed CNNs

Abstract: Based on the Lyapunov stability theorem as well as some facts about the positive definiteness and inequality of matrices, a new sufficient condition is presented for the existence of a unique equilibrium point and its global asymptotic stability for delayed CNNs. This condition imposes constraints on the feedback matrices independent of the delay parameter. This condition is less restrictive than that given in earlier references.

Current Progress in Gene Delivery Technology Based on Chemical Methods and Nano-carriers

Abstract: Gene transfer methods are promising in the field of gene therapy. Current methods for gene transfer include three major groups: viral, physical and chemical methods. This review mainly summarizes development of several types of chemical methods for gene transfer in vitro and in vivo by means of nano-carriers like; calcium phosphates, lipids, and cationic polymers including chitosan, polyethylenimine, polyamidoamine dendrimers, and poly(lactide-co-glycolide). This review also briefly introduces applications of these chemical methods for gene delivery.

Dynamics of a guided streamer (‘plasma bullet’) in a helium jet in air at atmospheric pressure

Abstract: It has been demonstrated experimentally that a non-equilibrium plasma column can be generated by discharge pulses in a helium jet surrounded by atmospheric-pressure air. The ?plasma jet? can be longer than 10?cm and fast imaging shows that most of the light emitted by the plasma jet is produced in a small ?plasma bullet? that propagates along the helium jet at speeds of several tens of km?s?1. With the help of a simple fluid model of the discharge, we show that the plasma jet is very similar to a cathode streamer (ionization wave) guided by the helium jet. We discuss the properties of the helium streamer and of the plasma channel behind the streamer head as a function of parameters such as electrode geometry, voltage pulse waveform and preionization density. The model can reproduce qualitatively and explain most of the features observed experimentally.