Showing papers by "Gilles Horowitz published in 2016"
TL;DR: It is shown that both smaller thickness and larger relative permittivity of c-PMMA contributes to reduced operating voltage, and negligible hysteresis brings evidence to small trap states in the semiconductor near gate dielectric of the n-type OFETs with c- PMMA.
Abstract: Recent improvement in the performance of the n-type organic semiconductors as well as thin gate dielectrics based on cross-linked polymers offers new opportunities to develop high-performance low-voltage n-type OFETs suitable for organic complementary circuits. Using TIPS-tetracyanotriphenodioxazine (TIPS-TPDO-tetraCN) and cross-linked poly(methyl methacrylate) (c-PMMA), respectively as n-type organic semiconductor and gate dielectric, linear regime field-effect mobility (1.8 ± 0.2) × 10–2 cm2 V–1s–1, small spatial standard deviation of threshold voltage (∼0.1 V), and operating voltage less than 3 V are attainable with the same device structure and contact materials used commonly for p-type OFETs. Through comparative static and dynamic characterizations of c-PMMA and PMMA gate dielectrics, it is shown that both smaller thickness and larger relative permittivity of c-PMMA contributes to reduced operating voltage. Furthermore, negligible hysteresis brings evidence to small trap states in the semiconductor n...
53 citations
TL;DR: In this paper, a compact model for OSCs, by identifying different regimes present in the device operation in dark and under light: OFF, exponential sub-$V_{\mathrm{\scriptscriptstyle ON}}$, power-law above- $V_{ \mathrm{textstyle ON}, and photocurrent, was proposed.
Abstract: Accurate description of the electrical behavior of organic solar cells (OSCs) becomes necessary with the advance of OSC technology toward up-scaled modules. We propose here a compact model for OSCs, by identifying different regimes present in the device operation in dark and under light: OFF, exponential sub- $V_{\mathrm{\scriptscriptstyle ON}}$ , power-law above- $V_{\mathrm{\scriptscriptstyle ON}}$ , and photocurrent. We also present a complete parameter extraction method for the model. In addition, we discuss the effect of the resistivity of transparent electrode and the device size on the OSC performance, by illustrating expected modifications on the current–voltage curve and parameter values.
8 citations
TL;DR: In this article, a finite element model for efficient organic bulk-heterojunction photovoltaics is presented, which allows to reproduce the major characteristics of a current-voltage curve measured under illumination.
Abstract: Finite-element modeling for efficient organic bulk-heterojunction photovoltaics is presented. Given the complexity of the architecture, it has been hard to devise a sufficiently compact description of the physics of charge and exciton dynamics. This paper delineates the most essential set of equations that allow to reproduce the major characteristics of a current---voltage curve measured under illumination. Parameters are extracted by optimization of a fabricated polymer/fullerene cell, and by deliberately changing key parameters, further understanding is established on the phenomenological manifestation of independent physical processes.
7 citations
TL;DR: A detailed electrical study is outlined that identifies the source to drain field dependent mobility due to thermal activation of carriers among traps in 6,13-bis(triisopropylsilylethynyl) (TIPS) pentacene.
Abstract: Nonlinear transport is intensively explained through Poole-Frenkel (PF) transport mechanism in organic thin film transistors with solution-processed small molecules, which is, 6,13-bis(triisopropylsilylethynyl) (TIPS) pentacene. We outline a detailed electrical study that identifies the source to drain field dependent mobility. Devices with diverse channel lengths enable the extensive exhibition of field dependent mobility due to thermal activation of carriers among traps.
1 citations