Photoinduced charge separation in photovoltaic cell with heterojunction of p- and n-type conjugated polymers

Onoda, Mitsuyoshi; Tada, Kazuya; Zakhidov, Anvar; Yoshino, Katsumi

doi:10.1016/s0040-6090(98)00901-8

Cited by 62 publications

(34 citation statements)

References 12 publications

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“…The estimated HOMO and LUMO values were )4.22 and )2.45 eV, respectively. HOMO and LUMO values of P3HT were reported as )5.2 and )3.0 eV, respectively [9]. In this system, even though HOMO values difference between PPy and P3HT was sufficient, LUMO values difference was only 0.55 eV which might not be high enough to overcome an exciton binding energy.…”

Section: Resultsmentioning

confidence: 74%

The photovoltaic effect of the p–n heterojunction organic photovoltaic device using a nano template method

Rhee

Lee

et al. 2005

Current Applied Physics

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Section: Resultsmentioning

confidence: 74%

The photovoltaic effect of the p–n heterojunction organic photovoltaic device using a nano template method

Rhee

Lee

et al. 2005

Current Applied Physics

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“…They include other conjugated polymer pairs, [51,52] conjugated polyelectrolytes, [53] semiconductor nanocrystals, [47,54] physically deposited small molecules, [29] sol-gel precursors [55] and metal films alternating with metal oxides. [4] It should be possible, therefore, to form nanostructured heterojunctions of different compositions for different purposes.…”

Section: Discussionmentioning

confidence: 99%

Laterally Ordered Bulk Heterojunction of Conjugated Polymers: Nanoskiving a Jelly Roll

Lipomi

Chiechi

Reus

et al. 2008

Adv Funct Materials

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This paper describes the fabrication of a nanostructured heterojunction of two conjugated polymers by a three‐step process: i) spin‐coating a multilayered film of the two polymers, ii) rolling the film into a cylinder (a “jelly roll”) and iii) sectioning the film perpendicular to the axis of the roll with an ultramicrotome (nanoskiving). The conjugated polymers are poly(benzimidazobenzophenanthroline ladder) (BBL, n‐type) and poly(2‐methoxy‐5‐(2′‐ethylhexyloxy)‐1,4‐phenylenevinylene) (MEH‐PPV, p‐type). The procedure produces sections with an interdigitated junction of the two polymers. The spacing between the phases is determined by spin‐coating (∼15 nm to 100 nm) and the thickness of each section is determined by the ultramicrotome (100 to 1000 nm). The minimum width of the MEH‐PPV layers accessible with this technique (∼15 nm) is close to reported exciton diffusion lengths for the polymer. When placed in a junction between two electrodes with asymmetric work functions (tin‐doped indium oxide (ITO) coated with poly(3,4‐ethylenedioxythiophene:poly(styrenesulfonate) (PEDOT:PSS), and eutectic gallium‐indium, EGaIn) the heterostructures exhibit a photovoltaic response under white light, although the efficiency of conversion of optical to electrical energy is low. Selective excitation of BBL with red light confirms that the photovoltaic effect is the result of photoinduced charge transfer between BBL and MEH‐PPV.

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“…The workfunction of aluminiuml is − 4.3 eV, and the highest occupied molecular orbital (HOMO) of P3HT has been estimated to range between −5.1 and − 5.2 eV, from an SCLC analysis of hole only thin film devices [29], cyclic voltametry [30], and photoelectron spectroscopy [31]. The energy gap estimated from absorption spectroscopy is about 2.1 eV, therefore the lowest unoccupied molecular orbital (LUMO) is about − 3.0 eV.…”

Section: Methodsmentioning

confidence: 99%

Current Conduction in Poly(3-Hexylthiophene) and in Poly(3- Hexylthiophene) doped [6,6]-Phenyl C61-Butyric Acid Methylester Composite Thin Film Devices

Chiguvare¹,

Parisi²

2012

Zeitschrift Für Naturforschung A

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Transport properties of poly(3-hexylthiophene) (P3HT), and of its blend with [6,6]-phenyl C61-butyric acid methylester (PCBM), were studied by analysing temperature dependent current-voltage characteristics of spin cast thin films sandwiched between aluminium electrodes in a metal-insulatormetal (MIM) configuration. It was found that in Al/P3HT/Al devices, the current is limited by space charge that accumulates near the hole injecting electrode due to the poor bulk transport properties of P3HT. At low temperatures and high applied electric fields the current density obeys a power law of the form J ∼ V m , characteristic of space charge limited current (SCLC) in the presence of exponentially distributed traps within the band gap. These traps are filled by charge that is injected by quantum mechanical tunnelling, which is adequately described by the Fowler-Nordheim (FN) theory. By calculating the majority charge carrier mobility in Al/P3HT/Al and Al/P3HT:PCBM/Al devices from the Ohmic, SCLC, and FN tunnelling fits at different temperatures, we have obtained that the charge carrier mobility in P3HT is two orders smaller than the electron mobility in the P3HT:PCBM blend at room temperature, but comparable at low temperatures. This information is important in determining the origin of open circuit voltage and short circuit current limit in solar cells that employ this blend as the active layer.

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Photoinduced charge separation in photovoltaic cell with heterojunction of p- and n-type conjugated polymers

Cited by 62 publications

References 12 publications

The photovoltaic effect of the p–n heterojunction organic photovoltaic device using a nano template method

The photovoltaic effect of the p–n heterojunction organic photovoltaic device using a nano template method

Laterally Ordered Bulk Heterojunction of Conjugated Polymers: Nanoskiving a Jelly Roll

Current Conduction in Poly(3-Hexylthiophene) and in Poly(3- Hexylthiophene) doped [6,6]-Phenyl C61-Butyric Acid Methylester Composite Thin Film Devices

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