Analyzing interfacial carrier charging in pentacene/C60 double-layer organic solar cells by optical electric field induced second-harmonic generation measurement

Chen, Xiangyu; Taguchi, Dai; Lee, Keanchuan; Manaka, Takaaki; Iwamoto, Mitsumasa

doi:10.1016/j.cplett.2011.06.082

Cited by 21 publications

(25 citation statements)

References 20 publications

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“…The photovoltaic performance of this element as organic solar cell was quite low, but this structure is suitable for studying the fundamental physical process induced by CE. The similar research approach has been demonstrated to be effective in the previous studies [10][11][12]. Figure 1 (c) shows the Maxwell-Wagner type equivalent circuit of the doublelayer element [10,11].…”

Section: Methodsmentioning

confidence: 64%

“…In our previous studies, by using optical electric-field-induced second-harmonic generation (EFISHG) measurement, we analyzed photo-induced interfacial carrier behaviors of organic solar cells (OSCs) [10,11]. The experimental flexibility of this optical method allowed us to investigate fundamental carrier processes in OSCs [11,12], without being influenced by electrostatic interference. These research progresses motivated us to study the detailed carrier behaviors in a hybrid energy generating system of both OSCs and TENG.…”

Section: Introductionmentioning

confidence: 99%

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Organic double layer element driven by triboelectric nanogenerator: Study of carrier behavior by non-contact optical method

Chen

Taguchi

Manaka

et al. 2016

Chemical Physics Letters

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By using optical electric-field-induced second-harmonic generation (EFISHG) technique, we studied carrier behavior caused by contact electrification (CE) in an organic double-layer element. This double-layer sample was half suspended in the open air, where one electrode (anode or cathode) was connected with a Cu foil for electrification while the other electrode was floated. Results showed two distinct carrier behaviors, depending on the (anode or cathode) connections to the Cu foil, and these carrier behaviors were analyzed based on the Maxwell-Wagner model. The double-layer sample works as a simple solar cell device. The photovoltaic effect and CE process have been proved to be two paralleled effects without strong interaction with each other, while photoconductivity changing in the sample can enhance the relaxation of CE induced charges. By probing the carrier behavior in this half-suspended device, the EFISHG technique has been demonstrated to be an effective non-contact method for clarifying the CE effect on related energy harvesting devices and electronics devices.Meanwhile, the related physical analysis in this letter is also useful for elucidating the fundamental characteristic of hybrid energy system based on solar cell and triboelectric nanogenerator.

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Section: Methodsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Organic double layer element driven by triboelectric nanogenerator: Study of carrier behavior by non-contact optical method

Chen

Taguchi

Manaka

et al. 2016

Chemical Physics Letters

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“…In OSCs, the actual carrier process, such as the carrier transport mechanism and driving force in actual PV cells, are still not so clear and the study of potential profiles as well as internal electric fields in PV devices will be helpful. In our previous researches [1,2], we already proved that Maxwell-Wagner type interfacial charging happened on each interfaces of OSCs and these charging processes degrade the performance of OSCs. Hence, it is necessary to reduce these interfacial charging processes in order to maintain a high performance for OSCs.…”

Section: Introductionmentioning

confidence: 93%

Interfacial carrier relaxation in the organic solar cell with inverted structure: the influence of conductivity degradation

Chen

Taguchi

Manaka

et al. 2013

Extended Abstracts of the 2013 International Conference on Solid State Devices and Materials

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“…Noteworthy that EFISHG experiment is employed in the same way for sandwiched-type devices with two electrodes, by using laser beam that obliquely incident onto the devices [28,[89][90][91][92]. Further we have recently developed a novel method that can detect electric field along the direction of incident laser beam by introducing a radial polarized beam into the EFISHG measurement system, and this system also makes us easy to study carrier transport in sandwiched-type devices [93,94].…”

Section: Trm-efishg For Visualization Of Electron and Hole Transportmentioning

confidence: 99%

Modeling and visualization of carrier motion in organic films by optical second harmonic generation and Maxwell-displacement current

Iwamoto¹,

Manaka²,

Taguchi³

2015

J. Phys. D: Appl. Phys.

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Probing and modeling of carrier motions in materials as well as in electronic devices is a fundamental research subject in science and electronics. According to the Maxwell electromagnetic field theory, carriers are a source of electric field. Therefore, by probing dielectric polarization caused by the electric field arising from moving carriers and dipoles, we can find a way to visualize the carrier motions in materials and in devices. The techniques used here are an electrical Maxwell-displacement current (MDC) measurement and a novel optical method based on electric field induced optical second harmonic generation (EFISHG) measurement. The MDC measurement probes changes of induced charge on electrodes, while the EFISHG probes nonlinear polarization induced in organic active layers due to coupling of electron clouds of molecules and electromagnetic waves of incident laser beam in the presence of dc field caused from electrons and holes. Both measurements allow us to probe dynamical carrier motions in solids through detection of dielectric polarization phenomena originated from dipolar motions and electron transport. In this Topical review, on the basis of the Maxwell's electro-magnetism theory in 1873, which stems from the Faraday's idea, the concept for probing electron and hole transport in solids by using the EFISHG is discussed in comparison with the conventional time of flight (TOF) measurement. We then visualize carrier transit in organic devices, i.e., organic field effect transistors, organic light emitting diodes, organic solar cells, and others. We also show that visualizing EFISHG microscopic image is a novel way for characterizing the anisotropic carrier transport in organic thin films. We also discuss the concept of the detection of rotational dipolar motions in monolayers by means of the MDC measurement, which is capable of probing the change of dielectric spontaneous polarization formed by dipoles in organic monolayers. Finally we conclude that ideas and experiments on EFISHG and MDC lead to a novel way for analyzing dynamical motions of electrons, holes, and dipoles in solids, thus these are available in organic electronic device application. to Eq. (1), we obtain the following equation:

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Analyzing interfacial carrier charging in pentacene/C60 double-layer organic solar cells by optical electric field induced second-harmonic generation measurement

Cited by 21 publications

References 20 publications

Organic double layer element driven by triboelectric nanogenerator: Study of carrier behavior by non-contact optical method

Organic double layer element driven by triboelectric nanogenerator: Study of carrier behavior by non-contact optical method

Interfacial carrier relaxation in the organic solar cell with inverted structure: the influence of conductivity degradation

Modeling and visualization of carrier motion in organic films by optical second harmonic generation and Maxwell-displacement current

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