Origin of charge generation efficiency of metal oxide p-dopants in organic semiconductors

2011 ◽  
Vol 12 (6) ◽  
pp. 950-954 ◽  
Author(s):  
Jae-Hyun Lee ◽  
Hyun-Mi Kim ◽  
Ki-Bum Kim ◽  
Jang-Joo Kim
Keyword(s):  
Metal Oxide ◽  
Organic Semiconductors ◽  
Generation Efficiency ◽  
Charge Generation

Charge Generation Efficiency of Electrically Doped Organic Semiconductors

2021 ◽  
pp. 100709
Author(s):  
Gunel Huseynova ◽  
Jonghee Lee ◽  
Jeong-Hwan Lee ◽  
Jae-Hyun Lee
Keyword(s):  
Organic Semiconductors ◽  
Generation Efficiency ◽  
Charge Generation

Engineering dielectric constants in organic semiconductors

2017 ◽  
Vol 5 (15) ◽  
pp. 3736-3747 ◽  
Author(s):  
Ardalan Armin ◽  
Dani M. Stoltzfus ◽  
Jenny E. Donaghey ◽  
Andrew J. Clulow ◽  
Ravi Chandra Raju Nagiri ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Organic Semiconductors ◽  
Organic Semiconductor ◽  
Photovoltaic Device ◽  
Dielectric Constants ◽  
Optical Frequency ◽  
Generation Efficiency ◽  
Charge Generation

An optical-frequency dielectric constant of 4.6 leads to improved charge generation efficiency in an organic semiconductor homojunction photovoltaic device.

Double-Excitation Dynamics in m-LPPP probed with sub-20 fs Time Resolution

2003 ◽  
Vol 771 ◽  
Author(s):  
C. Gadermaier ◽  
G. Cerullo ◽  
C. Manzoni ◽  
U. Scherf ◽  
E.J.W. List ◽  
...  
Keyword(s):  
Vibrational Relaxation ◽  
Broad Band ◽  
Generation Efficiency ◽  
Exciton Dissociation ◽  
Charge Generation ◽  
Carrier Generation ◽  
Dissociation Probability ◽  
Ultrafast Relaxation ◽  
First Excited State ◽  
Differential Transmission

AbstractIn a novel modification of transient differential transmission spectroscopy, the first excited state S1 is reexcited via a second laser pulse towards a higher lying state Sn. The dynamics of the relaxation of this state Sn as well as the states created from Sn are revealed by a broad-band probe pulse.We find that the charge carrier generation efficiency from Sn is higher compared to S1. The push and probe durations below 20 fs enable the temporal resolution of the ultrafast relaxation of the Sn state and enables us to identify the two main contributions to enhanced charge generation from Sn, energy migration towards sites of high dissociation probability, and exciton dissociation during vibrational relaxation.

Lead Halide Perovskites as Charge Generation Layers for Electron Mobility Measurement in Organic Semiconductors

2017 ◽  
Vol 9 (48) ◽  
pp. 42011-42019 ◽  
Author(s):  
John A. Love ◽  
Markus Feuerstein ◽  
Christian M. Wolff ◽  
Antonio Facchetti ◽  
Dieter Neher
Keyword(s):  
Organic Semiconductors ◽  
Electron Mobility ◽  
Charge Generation ◽  
Mobility Measurement ◽  
Halide Perovskites ◽  
Lead Halide

ChemInform Abstract: Mesoscopic Features of Charge Generation in Organic Semiconductors

ChemInform ◽  
2015 ◽  
Vol 46 (1) ◽  
Author(s):  
Brett M. Savoie ◽  
Nicholas E. Jackson ◽  
Lin X. Chen ◽  
Tobin J. Marks ◽  
Mark A. Ratner
Keyword(s):  
Organic Semiconductors ◽  
Charge Generation

Organic and nano-structured composite photovoltaics: An overview

2005 ◽  
Vol 20 (12) ◽  
pp. 3167-3179 ◽  
Author(s):  
Sophie E. Gledhill ◽  
Brian Scott ◽  
Brian A. Gregg
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Organic Semiconductors ◽  
Organic Solar Cells ◽  
Organic Materials ◽  
Low Cost ◽  
Open Circuit ◽  
Charge Generation ◽  
Dye Sensitized ◽  
Excitonic Solar Cells

Organic photovoltaic devices are poised to fill the low-cost, low power niche in the solar cell market. Recently measured efficiencies of solid-state organic cells are nudging 5% while Grätzel’s more established dye-sensitized solar cell technology is more than double this. A fundamental understanding of the excitonic nature of organic materials is an essential backbone for device engineering. Bound electron-hole pairs, “excitons,” are formed in organic semiconductors on photo-absorption. In the organic solar cell, the exciton must diffuse to the donor–accepter interface for simultaneous charge generation and separation. This interface is critical as the concentration of charge carriers is high and recombination here is higher than in the bulk. Nanostructured engineering of the interface has been utilized to maximize organic materials properties, namely to compensate the poor exciton diffusion lengths and lower mobilities. Excitonic solar cells have different limitations on their open-circuit photo-voltages due to these high interfacial charge carrier concentrations, and their behavior cannot be interpreted as if they were conventional solar cells. This article briefly reviews some of the differences between excitonic organic solar cells and conventional inorganic solar cells and highlights some of the technical strategies used in this rapidly progressing field, whose ultimate aim is for organic solar cells to be a commercial reality.

The Influence of Ordering on the Photoinduced Charge Transfer in Composites of Phenyl-type Substituted Polythiophenes with Methanofullerenes

1999 ◽  
Vol 598 ◽  
Author(s):  
Christoph J. Brabec ◽  
Christoph Winder ◽  
Markus C. Scharber ◽  
N. Serdar Sariciftci ◽  
Mats R. Andersson ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Transfer ◽  
Treatment Results ◽  
Generation Efficiency ◽  
Charge Generation ◽  
Photoinduced Charge Transfer ◽  
Strong Electron ◽  
Low Energies ◽  
Photoinduced Charge ◽  
Absorption Measurements

ABSTRACTRegioregular polythiophenes baring 3-(p-methoxyethoxyethoxy)-phenyl substituents (PEOPT) show high photoluminescence efficiencies. Exposing thin films of this polymer to vapors of chloroform or annealing them by heat treatment results in a red shift of the absorption maximum due to solvent or heat induced ordering which gives rise to more planar conformations. The fact, that annealed thin films of PEOPT exhibit absorption edges at relatively low energies and thus have an enhanced spectral range makes them suitable for use in photodiodes / solar cells. The photoinduced charge generation efficiency in PEOPT is significantly enhanced by the addition of a strong electron acceptor like fullerene, as observed by quenching of the luminescence and by photoinduced absorption measurements in the infrared and UV-Vis regime. The efficiency of the photoinduced charge transfer from PEOPT to a methanofullerene is found to depend on the ordering of PEOPT in thin films.

scholarly journals Photoconversion Mechanism at the pn-Homojunction Interface in Single Organic Semiconductor

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1727 ◽  
Author(s):  
Ji-Hyun Lee ◽  
Armand Perrot ◽  
Masahiro Hiramoto ◽  
Seiichiro Izawa
Keyword(s):  
Organic Semiconductors ◽  
Organic Semiconductor ◽  
Energy Structure ◽  
Free Charge ◽  
Charge Generation ◽  
Recombination Processes ◽  
Single Host ◽  
Donor Acceptor ◽  
Doping Technique ◽  
Determining Factor

Clarifying critical differences in free charge generation and recombination processes between inorganic and organic semiconductors is important for developing efficient organic photoconversion devices such as solar cells (SCs) and photodetector. In this study, we analyzed the dependence of doping concentration on the photoconversion process at the organic pn-homojunction interface in a single organic semiconductor using the temperature dependence of J–V characteristics and energy structure measurements. Even though the organic pn-homojunction SC devices were fabricated using a single host material and the doping technique resembling an inorganic pn-homojunction, the charge generation and recombination mechanisms are similar to that of conventional donor/acceptor (D/A) type organic SCs; that is, the charge separation happens from localized exciton and charge transfer (CT) state being separated by the energy offset between adjacent molecules, and the recombination happens from localized charge carrier at two adjacent molecules. The determining factor for photoconversion processes is the localized nature of charges in organic semiconductors. The results demonstrated that controlling the delocalization of the charges is important to realize efficient organic photoconversion devices.

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