Ambipolar organic thin-film transistors using C60/pentacene structure: Characterization of electronic structure and device property

Kang, Seongsoo; Yi, Yeonjin; Kim, C. Y.; Cho, K.; Seo, Jung Hwa; Noh, Maengseok; Jeong, Kyu Shik; Yoo, Keunje; Whang, C. N.

doi:10.1063/1.2138810

Cited by 32 publications

(15 citation statements)

References 19 publications

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“…Ambipolar transport has been demonstrated in many other bi-layer heterostructures, including C 60 /pentacene [38][39][40], C 60 /BP2T [41], C 60 /2,6-diphenylbenzo[1,2-b:4,5-b'] diselenophene (DPh-BDS) [42], C 60 /2,2',7,7'-tetra-(m-tolyl-phenylamino)-9,9'-spirobifl uorene (spiro-TPD) [43], P13-α/ω-dihexyl-quaterthiophene (DH4T) [44,45], P13-α/ω-dihexylsexithiophene (DH6T) [46], F 16 CuPc-α/α'-dihexylsexithiophene (DH-α6T) [47] and pentacene/ perfl uoropentacene [48].…”

Section: Review Articlementioning

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: Review Articlementioning

confidence: 99%

Organic heterostructures in organic field-effect transistors

2010

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“…We find previous results based on similar pentacene/C 60 bilayer structures that only yielded low electron mobility. [7][8][9]15 Based on our study here, we consider that these poor results originated from employing thick pentacene layers (typically a few tens of nanometers). Our results, instead, suggest that it is beneficial to utilize thinner pentacene layers, i.e., 1 to 2 MLs, to achieve high electron mobility.…”

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confidence: 98%

“…Overall, the control of pentacene layer can serve as a simple knob to tune the electrical properties in the C 60 (top)/pentacene(bottom) bilayer system exhibiting electron and hole transport (or ambipolar transport). [6][7][8][9] Such a strategy is, in fact, the key idea of achieving high performance organic thin-film transistors (OTFTs) for this study.…”

mentioning

confidence: 99%

Enhancing crystallinity of C60 layer by thickness-control of underneath pentacene layer for high mobility C60/pentacene ambipolar transistors

Ahn

Kim

Park

et al. 2013

Applied Physics Letters

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We present systematic control of the crystallinity and electrical transport properties of C60 films that are deposited onto pentacene layers, based on simple tuning of the underneath pentacene layer thickness. With increasing the pentacene layer thickness from 0 to 2 monolayers, we observed improvement in crystallinity and grain size of the C60 layer, which led to dramatic enhancement in electron conduction. Also, hole transport in this bilayer structure could be generated when the thickness of the pentacene layer was above one monolayer. The resulting ambipolar transport thin-film transistors yielded electron and hole mobilities as high as 2.8 and 0.3 cm2 V−1 s−1, respectively, and complementary inverters with gain value above 20.

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“…The hole and electron mobilities at the saturation regime were found to be 2.5 × 10 −3 cm 2 V −1 s −1 and 1.2 × 10 −2 cm 2 V −1 s −1 , respectively, which is similar to those of reported ambipolar transistors. [39,40] Subsequently, we studied the charge transport after programming the Au NP mono layer by application of gate bias. For ambipolar transistors without Au NPs, there is negligible charging/discharging effect observed after applying bias pulses ( Figure S3).…”

Section: Doi: 101002/adma201104375mentioning

confidence: 99%

Controlled Ambipolar Charge Transport Through a Self‐Assembled Gold Nanoparticle Monolayer

Zhou

Han

et al. 2012

Advanced Materials

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An active mechanism for controlling ambipolar charge transport is developed based on self-assembled monolayers of gold nanoparticles. Electron and hole currents are manipulated by controlling the gate bias in order to overcome the intrinsic material limitations. The endurance and retention measurements confirm that this method exhibits good electrical reliability and stability. This solution process approach has potential for applications in large-area printed electronic devices.

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Ambipolar organic thin-film transistors using C60/pentacene structure: Characterization of electronic structure and device property

Cited by 32 publications

References 19 publications

Organic heterostructures in organic field-effect transistors

Organic heterostructures in organic field-effect transistors

Enhancing crystallinity of C60 layer by thickness-control of underneath pentacene layer for high mobility C60/pentacene ambipolar transistors

Controlled Ambipolar Charge Transport Through a Self‐Assembled Gold Nanoparticle Monolayer

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