Effect of substrate temperature on orientation of subphthalocyanine molecule in organic photovoltaic cells

Chou, Chi-Ta; Tang, Weibing; Tai, Yian; Lin, Chien-Hung; Liu, Chin-Hsin J.; Chen, Li‐Chyong; Chen, Kuei‐Hsien

doi:10.1016/j.tsf.2011.09.062

Cited by 24 publications

(12 citation statements)

References 27 publications

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“…Considering other possible causes, we rule out differing levels of chemical contamination by using the same purified source of SubPc for all devices, and because SubPc will not deposit on substrates held above 130 °C, we likewise rule out changes in thermal decomposition, and so infer a physical origin. This is in agreement with Chou et al, who observed that while modest differences in substrate temperature during deposition were able to significantly affect V OC , very little change in the SubPc surface was discernible, as we also find. Instead, the primary physical change was determined to be a difference in molecular orientation, which correlated with both an increase in V OC and SubPc hole mobility .…”

Section: Discussionmentioning

confidence: 99%

In Situ Measurement of Energy Level Shifts and Recombination Rates in Subphthalocyanine/C₆₀ Bilayer Solar Cells

Credgington¹,

Liu

Nelson³

et al. 2014

J. Phys. Chem. C

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Understanding the nature and impact of internal interfaces is critical to understanding the operation of nanostructured organic devices, such as organic photovoltaics.Here, we use transient optoelectronic analyses to quantify in situ the HOMO level shifts and changes in interfacial recombination rate that occur within thermally evaporated subphthalocyanine (SubPc)/C 60 bilayer solar cells as the SubPc evaporation source is varied. We show how such measurements can complement ex situ optical and physical techniques to access the functional impact of device modification, particularly with respect to the resulting device open-circuit voltage (V OC ). We are able to explain how subtle changes in SubPc deposition conditions lead to significant modification of interfacial energetics and recombination dynamics, which in turn cause substantial changes in V OC .

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Section: Discussionmentioning

confidence: 99%

In Situ Measurement of Energy Level Shifts and Recombination Rates in Subphthalocyanine/C₆₀ Bilayer Solar Cells

Credgington¹,

Liu

Nelson³

et al. 2014

J. Phys. Chem. C

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“…Furthermore, it should be noted that molecular orientation is crucial for almost all applications based on organic semiconductors, as this feature strongly influences not only the light emission of organic dyes but also the light propagation in stratified media due to birefringence [88][89][90][91] as well as their electrical properties due to orientation-dependent charge carrier transport and injection [92][93][94][95][96][97][98][99][100][101][102][103]. Moreover, light absorption and charge collection in organic solar cells are strongly influenced by molecular orientation of the active materials as well [104][105][106][107][108][109][110][111][112][113][114].…”

Section: A External Quantum Efficiency Of Oledsmentioning

confidence: 99%

Emitter Orientation as a Key Parameter in Organic Light-Emitting Diodes

et al. 2017

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The distinct preferential alignment, i.e., horizontal orientation with respect to the substrate plane, of the optical transition dipole moment vectors (TDMVs) of organic dye molecules is of paramount importance for extracting the internally generated power of organic light-emitting diodes (OLEDs) to the outside world. This feature is one of the most promising approaches for the enhancement of the electrical efficacy in stateof-the-art OLEDs, as their internal quantum efficiencies are already close to the ultimate limit. If one can achieve complete horizontal orientation of the TDMVs, it is possible to increase the efficiency by at least 50% because alignment strongly influences the power dissipation into the different optical modes present in such a thin-film device. Thus, this feature of organic light-emitting molecules can lead to advanced performance for future applications. Therefore, we present here a review of recent achievements, ongoing research, and future tasks in this particular area of organic electronics.

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“…Their delocalized 14-π-system characterisc confers them interesting optical properties that have been exploited in the field of dyes, nonlinear optics, organic solar cells and field effect transistors. [6][7][8][9] In this paper, seven different binuclear subphthalocyanines were designed, synthesized and characterized. The catalytic activity of the compounds to Li/SOCl 2 battery was measured.…”

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confidence: 99%

Catalytic Activity of a Series of Binuclear Subphthalocyanines to the Li/SOCl2 Battery

Guo

Dong

et al. 2014

ECS Electrochemistry Letters

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A new dimer of subphthalocyanine and Seven derivatives ([RPhO-BSubPcOPh] 2 ) of it have been synthesized, characterized and developed for high efficient catalysts to Lithium/thionyl chloride (Li/SOCl 2 ) battery. The stored energy and the capacity of the batteries whose electrolytes contain these compounds as catalysts are increased by approximately 21.4%-33.1% and 15.7%-32.7% than that of the battery in the absence of them. In addition, the results of cyclic voltammetry states that a two-step electron transfer occurs in the reduction process of SOCl 2 .Li/SOCl 2 battery, with high battery voltage and energy density, is a very useful electrochemical power source. 1 It is an ideal candidate for security systems and monitoring systems. 2,3 However, the stored energy and the capacity of the batteries can be still improved to expand the application of them. The using of catalysts can achieve this purpose by extending the discharge time or improving the discharge voltage. To the best of our knowledge, subphthalocyanines used as catalyst in this area have not been reported. Subphthalocyanines (SubPc) 4,5 are cone-shaped, aromatic macrocycles made of three diminoisoindoline units N-fused around a boron atom. Their delocalized 14-π-system characterisc confers them interesting optical properties that have been exploited in the field of dyes, nonlinear optics, organic solar cells and field effect transistors. [6][7][8][9] In this paper, seven different binuclear subphthalocyanines were designed, synthesized and characterized. The catalytic activity of the compounds to Li/SOCl 2 battery was measured. The stored energy and the capacity of the batteries were increased by approximately 21.4%-33.1% and 15.7%-32.7%, respectively. A three-step hypothetical mechanism was proposed and proved by the cyclic voltammetry. ExperimentalThe synthetic process is described in Scheme 1. Compound 1 was formed by the nucleophilic aromatic substitution reaction of 4-nitrophthalonitrile with 4, 4 -dihydroxybiphenyl in the presence of K 2 CO 3 . 10 Compound 2 was prepared as the method described in literature. 11 Replacement of the bromine atom was prepared by compound 2 reacting with the corresponding phenol. 12 All the compounds were characterized by IR, UV and elemental analysis.

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Effect of substrate temperature on orientation of subphthalocyanine molecule in organic photovoltaic cells

Cited by 24 publications

References 27 publications

In Situ Measurement of Energy Level Shifts and Recombination Rates in Subphthalocyanine/C₆₀ Bilayer Solar Cells

In Situ Measurement of Energy Level Shifts and Recombination Rates in Subphthalocyanine/C₆₀ Bilayer Solar Cells

Emitter Orientation as a Key Parameter in Organic Light-Emitting Diodes

Catalytic Activity of a Series of Binuclear Subphthalocyanines to the Li/SOCl2 Battery

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Effect of substrate temperature on orientation of subphthalocyanine molecule in organic photovoltaic cells

Cited by 24 publications

References 27 publications

In Situ Measurement of Energy Level Shifts and Recombination Rates in Subphthalocyanine/C60 Bilayer Solar Cells

In Situ Measurement of Energy Level Shifts and Recombination Rates in Subphthalocyanine/C60 Bilayer Solar Cells

Emitter Orientation as a Key Parameter in Organic Light-Emitting Diodes

Catalytic Activity of a Series of Binuclear Subphthalocyanines to the Li/SOCl2 Battery

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Product

Resources

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In Situ Measurement of Energy Level Shifts and Recombination Rates in Subphthalocyanine/C₆₀ Bilayer Solar Cells

In Situ Measurement of Energy Level Shifts and Recombination Rates in Subphthalocyanine/C₆₀ Bilayer Solar Cells