Study of the effect of the charge transport layer in the electrical characteristics of the organic photovoltaics

Rahimi, Ronak; Roberts, Alex; Narang, V.; Kumbham, V.; Korakakis, D.

doi:10.1016/j.optmat.2012.12.011

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…Böylesi ürünlerin popülaritesi düşük maliyetleri, geniş yüzey alanları ve esnek altlıklarla uyumlarından kaynaklanmaktadır. Bu bağlamda Rahimi ve ark., yük aktarım tabakasındaki kalınlık değişiminin organik fotovoltaiklerin elektriksel özelliklerine olan etkilerine bakmışlardır [126]. Yüksek mekanik esnekliğe sahip organik polimerler mevcut avantajları ve plastik ve metal altlıklar üzerine uygulanmış geniş yüzeyli organik fotovoltaiklerin üretiminde gösterdikleri hızlı ilerleme sayesinde dikkat çekmektedirler.…”

Section: Son Dönem Gelişmeleriunclassified

Organik Camlar

AKKAŞOĞLU

Karasu

2018

El-Cezeri Fen Ve Mühendislik Dergisi

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Poli akrilat, polis stren ve polikarbonat gibi organik polimerlerden ve metil metakrilatlı vinil klorür kopolimerlerinden elde edilen şeffaf, katı malzemelere teknik bağlamda organik cam adı verilmektedir. Endüstride, "organik cam" terimi ile genellikle metil metakrilatın blok polimerizasyonuyla üretilen bir malzeme tabakası anlaşılmaktadır. Organik cam, vakum ya da pnömatik şekillendirme veya baskılanma yöntemleriyle işlenebilmektedir, ayrıca, mekanik sürece tabi tutulabilmekte ve yapıştırılıp kaynaklanabilmektedir. Hava araçlarında, otomobillerde ve gemilerde yapı malzemesi, kış bahçelerinde, pencere ve verandalarda örtücü olarak kullanılmaktadır. Binalar sıklıkla organik camlarla dekore edilmekte ve cihaz parçalarında, protezlerde, lenslerde, optik uygulama pirizmalarında, ayrıca yiyecek endüstrisi borularında değerlendirilmektedir. Bu çalışmada organik camlar tanımlanmakta, türleri, üretimleri ve son dönem çalışmaları sunulmaktadır.

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Section: Son Dönem Gelişmeleriunclassified

Organik Camlar

AKKAŞOĞLU

Karasu

2018

El-Cezeri Fen Ve Mühendislik Dergisi

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“…In this study, we investigated the heterojunction effects of three different n-type PTCDI derivatives (PTCDI-C 8 , 4-FPEPTC, and 2,4-FPEPTC) on the pentacene OFET once the derivatives are attached as patches. The PTCDI derivatives are representative n-type semiconducting materials with high electron mobilities that provide favorable energy alignment for charge transfer at the interface with pentacene. − The three PTCDI derivatives include different substituents on the nitrogen atoms of the imide groups, i.e., octyl, (4-fluorophenyl)ethyl, and (2,4-fluorophenyl)ethyl. The molecules with different fluorine group contents were expected to exhibit different interactions with the underlying pentacene layer, especially as the PTCDI derivatives tended to stand upright on pentacene in an edge-on configuration. ,, The HOMO/LUMO energy levels and band gaps of these PTCDI derivatives were nearly identical (Figure ).…”

Section: Introductionmentioning

confidence: 99%

pn-Heterojunction Effects of Perylene Tetracarboxylic Diimide Derivatives on Pentacene Field-Effect Transistor

Yu¹,

Kang

et al. 2015

ACS Appl. Mater. Interfaces

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We investigated the heterojunction effects of perylene tetracarboxylic diimide (PTCDI) derivatives on the pentacene-based field-effect transistors (FETs). Three PTCDI derivatives with different substituents were deposited onto pentacene layers and served as charge transfer dopants. The deposited PTCDI layer, which had a nominal thickness of a few layers, formed discontinuous patches on the pentacene layers and dramatically enhanced the hole mobility in the pentacene FET. Among the three PTCDI molecules tested, the octyl-substituted PTCDI, PTCDI-C8, provided the most efficient hole-doping characteristics (p-type) relative to the fluorophenyl-substituted PTCDIs, 4-FPEPTC and 2,4-FPEPTC. The organic heterojunction and doping characteristics were systematically investigated using atomic force microscopy, 2D grazing incidence X-ray diffraction studies, and ultraviolet photoelectron spectroscopy. PTCDI-C8, bearing octyl substituents, grew laterally on the pentacene layer (2D growth), whereas 2,4-FPEPTC, with fluorophenyl substituents, underwent 3D growth. The different growth modes resulted in different contact areas and relative orientations between the pentacene and PTCDI molecules, which significantly affected the doping efficiency of the deposited adlayer. The differences between the growth modes and the thin-film microstructures in the different PTCDI patches were attributed to a mismatch between the surface energies of the patches and the underlying pentacene layer. The film-morphology-dependent doping effects observed here offer practical guidelines for achieving more effective charge transfer doping in thin-film transistors.

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“…In this vein, we investigate the discontinuous heterojunction effect of p-type pentacene films partially covered with n-type dioctyl perylene tetracarboxylic diimide (PTCDI-C 8 ). The PTCDI-C 8 was selected as the top layer primarily because PTCDI-C 8 /pentacene exhibits a favorable energy alignment for charge transfer at the heterojunction interface (Figure a). − Also, PTCDI-C 8 is a commercially available, benchmark n-type organic semiconductor, of which application can be universalized readily . By controlling the density of PTCDI-C 8 applied on pentacene, systematic variations in hole mobility, threshold voltage, and activation energy for charge transport were observed.…”

Section: Introductionmentioning

confidence: 99%

Discontinuous pn-Heterojunction for Organic Thin Film Transistors

Cho

Yu²,

Kim³

et al. 2014

J. Phys. Chem. C

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Utilization of discontinuous pn-oragnic heterojunction is introduced as a versatile method to improve charge transport in organic thin film transistors (OTFTs). The method is demonstrated by depositing n-type dioctyl perylene tetracarboxylic diimide (PTCDI-C8) discontinuously onto base p-type pentacene OTFTs. A more pronounced impact of the discontinuous upper layer is obtained on the transistor performances when thinner base layers are employed; a >100-fold enhancement in hole mobility and a >20 V shift in threshold voltage are achieved after applying PTCDI-C8 discontinuously onto 2 nm thick pentacene thin films. Local surface potential measurements (Kelvin-probe force microscopy) and temperature-dependent transport measurements (77–300 K) reveal that the interfacial dipole formed at the pn-heterostructures effectively dopes the base pentacene films p-type and leads to a reduction in transport activation energy.

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Study of the effect of the charge transport layer in the electrical characteristics of the organic photovoltaics

Cited by 10 publications

References 16 publications

Organik Camlar

Organik Camlar

pn-Heterojunction Effects of Perylene Tetracarboxylic Diimide Derivatives on Pentacene Field-Effect Transistor

Discontinuous pn-Heterojunction for Organic Thin Film Transistors

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