Isotype heterojunction between organic crystalline semiconductors

Wang, Haibo; Wang, Xiujin; Huang, Haichao; Yan, Donghang

doi:10.1063/1.2979707

Cited by 22 publications

(14 citation statements)

References 20 publications

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“…Th e eff ect of the n-n isotype organic heterojunction has been observed in a system composed of F 16 CuPc and phthalocyanine tin(IV) dichloride (SnCl 2 Pc) [26]. Kelvin probe force microscopy ( Figure 5(c)) reveals that the energy band of SnCl 2 Pc shows an upward bending of around 0.35 eV from the bulk to the interface, which indicates the presence of an electron-depletion region.…”

Section: Isotype Heterojunctionsmentioning

confidence: 99%

Organic heterostructures in organic field-effect transistors

2010

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C onsiderable eff ort has been devoted to the development of low-cost, fl exible, large-area organic electronics for consumer products over the past two decades [1][2][3]. Organic fi eld-eff ect transistors (OFETs), important organic electronic devices, are of considerable interesting due to their wide range of potential applications, including use as display drivers and in identifi cation tags and sensors. Many methods have been developed to improve OFET performance by increasing mobility and the on/off ratio, and by reducing the threshold voltage. Th ese improvements have been achieved through the synthesis of new organic semiconductor materials, improving the device structure, controlling the deposition of crystalline organic fi lms and adopting various organic heterostructures. Recently, OFETs exhibiting mobility of the same order of magnitude as that of amorphous silicon FETs have been successfully demonstrated.Organic heterostructures have been used in organic light-emitting diodes (OLEDs) and organic photovoltaic (OPV) cells to improve device performance. In a typical double-layer OLED structure [4], the organic heterojunction reduces the onset voltage and improves the illumination effi ciency. Organic heterojunctions have also been used to improve the power conversion effi ciency of OPV cells by an order of magnitude over single-layer cells [5]. Ambipolar OFETs, which require that both electrons and holes be accumulated and transported in the device channel depending on the applied voltage, were fi rst realized by introducing organic heterostructures as active layers [6]. It is therefore clear that organic heterostructures have an important role in the continued development of organic electronic devices. Th e introduction of organic heterostructures has signifi cantly improved device performance and allowed new functions in many applications, and so understanding the eff ects of the organic heterostructure is desirable and necessary.Th ere has been considerable focus on understanding the interfacial electronic structures of organic heterostructure consisting of amorphous or semi-crystalline organic semiconductors [7][8][9]. Various models have been proposed to predict the alignment of the vacuum level and the interface dipole in certain organic heterojunctions [8,9], and a dependence of the interface dipole on the molecular orientation has been reported [10]. In crystalline organic semiconductors, the phenomenon of band bending [11,12] has been observed at organic/inorganic and organic/organic interfaces, and band transport, in which orbital-derived electronic bands are produced due to the overlap of the π-orbitals of adjacent molecules, has also been argued [13].Th e recent discovery of high conductivity in heterojunction transistors constructed using thin crystalline fi lms of p-type copper phthalocyanine (CuPc) and n-type copper-hexadecafl uoro-phthalocyanine (F 16 CuPc) as active layers has stimulated interest in organic heterojunctions [14][15][16]. Electron-and hole-accumulation layers have been ob...

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Section: Isotype Heterojunctionsmentioning

confidence: 99%

Organic heterostructures in organic field-effect transistors

2010

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“…[13][14][15][16] In these transistors, energy level bending was observed at the interfaces due to charge transfer at the heterojunctions. 23 While KPFM can only observe the surface potential of the top layer, photoelectron spectroscopy can simultaneously observe the energy level shift in the two semiconductor layers forming the junction. 21,22 So far most organic heterojunctions reported are anisotype, i.e., formed between n-type and p-type materials.…”

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confidence: 99%

“…23 Similarly, for transistors using SnCl 2 Pc as bottom layer semiconductor and F 16 CuPc as top layer semiconductor, electrons in the SnCl 2 Pc layer would be depleted with increasing F 16 CuPc thickness, due to the energy level bending upward, if the SnCl 2 Pc thickness is fixed and smaller than the width of the space-charge layer. building-up of energy level bending.…”

mentioning

confidence: 99%

Interfacial electronic structure of copper hexadecafluorophthalocyanine and phthalocyanatotin (IV) dichloride studied by photoemission spectroscopy

Wang

Liu

et al. 2010

Applied Physics Letters

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“…14,15 As for isotype organic heterojunctions, the features and related electronic devices have also been reported. 16,17 Inorganic materials have also been introduced into various organic electronic devices. [18][19][20][21][22][23][24][25] For example, pentacene/ zinc oxide ͑ZnO͒ bilayer transistors with different operation modes have been obtained by varying the thickness of ZnO layer.…”

Section: Introductionmentioning

confidence: 99%

Organic-inorganic heterojunction field-effect transistors

Wang¹,

Liu²,

Lo³

et al. 2010

Journal of Applied Physics

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Field-effect transistors with organic-inorganic heterojunctions of molybdenum trioxide (MoO3)/pentacene and MoO3/copper-phthalocyanine (CuPc) as active layers were prepared and analyzed. These transistors showed normally-on operation mode and a shift of threshold voltage comparing to the corresponding single-layer organic device. The interfacial electronic structures of MoO3/pentacene and MoO3/CuPc heterojunctions were investigated by ultraviolet photoemission spectroscopy. Significant electron energy level bending and space charge regions of high conductivity were observed at the heterojunction. Formation of the organic-inorganic heterojunctions and characteristics of the corresponding field-effect transistors were analyzed by considering charge exchange at heterojunction interfaces.

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Isotype heterojunction between organic crystalline semiconductors

Cited by 22 publications

References 20 publications

Organic heterostructures in organic field-effect transistors

Organic heterostructures in organic field-effect transistors

Interfacial electronic structure of copper hexadecafluorophthalocyanine and phthalocyanatotin (IV) dichloride studied by photoemission spectroscopy

Organic-inorganic heterojunction field-effect transistors

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