thin film phthalocyanines(pc), incloding zinc, iron, and magnesium phthalocyani-nes, were prepared by vacuum deposition method. chronocoulometry was used to study the charge transfer reaction mechanism of ionic species through the thin films. the results obtained in chronocoulometric studies shows that the thin film phthalocyanines could operate via two mechanisms.the first mechanism metal pc t...

A TADF emitter exhibiting high OLED device performance of 25% and narrow emission (FWHM = 58 nm) in the deep blue region ( ? em 458 nm, CIE 0.14, 0.13) due to balanced charge transfer interactions locked molecular geometry.

In this paper we present current voltage and trans-conductance model for Dual Material Gate AlGaN/GaN HEMT. Our proposed model demonstrates complete charge control in 2DEG based channel of the device in order to investigate the current-voltage as well as transfer characteristics of the device under various gate and drain biases. The proposed device structure uses GaN material capable to withsta...

Charge transfer and accumulation at semiconductor devices can lead to device degradation. Understanding and controlling such a process is therefore important. Second harmonic generation has been shown to be a sensitive probe of charging of semiconductor interfaces, with the added advantages of high spatial and temporal resolution. We have investigated the use of self assembled monolayers ~SAMs!...

The electron-acceptor molecule TCNQ is found in either of two distinct integer charge states when embedded into a monolayer of a charge transfer complex on a gold surface. Scanning tunneling spectroscopy measurements identify these states through the presence or absence of a zero-bias Kondo resonance. Increasing the (tip-induced) electric field allows us to reversibly induce the oxidation or re...

We probed the charge transfer interaction between the amine-containing molecules hydrazine, polyaniline, and aminobutyl phosphonic acid and carbon nanotube field effect transistors (CNTFETs). We successfully converted p-type CNTFETs to n-type and drastically improved the device performance in both the ON- and OFF-transistor states, utilizing hydrazine as dopant. We effectively switched the tran...

This paper describes a qualification programme for Electron-Multiplication Charge Coupled Devices (EMCCDs) for use in space applications. While the presented results are generally applicable, the programme was carried out in the context of CCD development for the Radial Velocity Spectrometer (RVS) instrument on the European Space Agency’s cornerstone Gaia mission. We discuss the issues of devic...

the charge-transfer complexation reaction between iodine and dibenzo- 18-crown- 6 (db18c6) has been studied spectrophotometrically in chloroform solution at different temperatures. the resulting donor-acceptor complex was formulated as (db 18c6…i )i . the spectrophotometric results , as well as the conductivity measurements, indicated that the gradual release of tiiodide ion from its contact io...

Despite significant improvements in the performance of organic photovoltaic devices in recent years, the tradeoff between light absorption and charge separation efficiency remains pervasive; increasing light absorption by increasing the device thickness leads to a decrease in exciton diffusion efficiency and vice versa. In this thesis, I demonstrate organic solar cells with an external light ab...