Junction‐Free Electrospun Ag Fiber Electrodes for Flexible Organic Light‐Emitting Diodes

Choi, Junho; Shim, Yong; Park, Cheol Hwee; Hwang, Ha; Kwack, Jin Ho; Lee, Dong Hoon; Park, Young Wook; Ju, Byeong Kwon

doi:10.1002/smll.201702567

Cited by 45 publications

(39 citation statements)

References 32 publications

(36 reference statements)

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“…Therefore, previous studies attempted to reduce surface roughness by hybridizing them with other conductive materials. 14,33,[39][40][41] However, surface planarization with thin layers may not be effective if the step heights of electrodes are considerably higher than the thickness of the subsequent layer. Herein, we aimed to develop electrodes with the smallest step height while retaining the desired high transmittance and low sheet resistance.…”

Section: Flexible Organic Solar Cell Device Performancesmentioning

confidence: 99%

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Highly Efficient (>10%) Flexible Organic Solar Cells on PEDOT‐Free and ITO‐Free Transparent Electrodes

Seo

Lee

et al. 2019

Advanced Materials

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We present a novel approach to fabricate flexible organic solar cells without indium tin oxide (ITO) and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS). We use junctionfree metal nanonetworks (NNs) as transparent electrodes. The metal NNs are monolithically etched using nanoscale shadow masks, and they exhibit excellent optoelectronic performance. Furthermore, the optoelectrical properties of the NNs can be controlled by both the initial metal layer thickness and NN density. Hence, with an extremely thin silver layer, the appropriate density control of the networks can lead to high transmittance and low sheet resistance. Such NNs can be utilized for thin film devices without planarization by conductive materials such as PEDOT:PSS. As a result, we successfully fabricate a highly efficient flexible organic solar cell with a power conversion efficiency (PCE) of 10.6% and high device yield (93.8%) on PEDOT-free and ITO-free transparent electrodes. Furthermore, the flexible solar cell retains 94.3% of the initial PCE even after 3000 bending stress tests (strain: 3.13%).

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Section: Flexible Organic Solar Cell Device Performancesmentioning

confidence: 99%

“…[29][30][31][32] Choi et al pointed out that a network height of 80 nm was extremely rough for a 140-nmthick OLED active layer. 33 Thus, there are few reports on high efficiency thin film FOSCs (> 10%) that use this type of metal networks.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient (>10%) Flexible Organic Solar Cells on PEDOT‐Free and ITO‐Free Transparent Electrodes

Seo

Lee

et al. 2019

Advanced Materials

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“…Electrospinning is a facile method that can prepare free‐standing and meter‐long polymer nanofibers (NFs) with diameters ranging from several ten nanometers to several micrometers. Electrospun NF‐templated deposition of metal NFs has been in the limelight nowadays . Metal NF meshes were typically prepared by vacuum‐depositing metal on the free‐standing polymer NF mesh templates, and subsequently transferring the obtained meshes to transparent substrates .…”

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confidence: 99%

Solution‐Grown Serpentine Silver Nanofiber Meshes for Stretchable Transparent Conductors

Zhang

et al. 2018

Adv Elect Materials

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Electrospinning is a facile method that can prepare free-standing and meter-long polymer nanofibers (NFs) with diameters ranging from several ten nanometers to several micrometers. Electrospun NF-templated deposition of metal NFs has been in the limelight nowadays. [18][19][20][21][22][23] Metal NF meshes were typically prepared by vacuum-depositing metal on the free-standing polymer NF mesh templates, and subsequently transferring the obtained meshes to transparent substrates. [24] Recent studies have made constant improvements in the electrical stability and stretchability of the vacuum-deposited metal NF meshes. [25][26][27] However, the required transfer step is a double-edged sword. On one hand, it enables the metal NF meshes to attach on any surface to meet different application requirement, for example, Jin et al. [22] and Huang et al. [25] transferred the Au NFs onto the prestrained substrates and obtained buckled Au NFs with higher resistance to strain than the straight Au NFs. On the other hand, the free-standing NF meshes are easily damaged by the external force, which severely limits their large-area preparation. In contrast, the chemical-plated metal NFs have attracted increasing attention by virtue of low energy consumption and compatibility with large-area manufacturing. [18,[28][29][30][31] A pioneering work was carried out by Hsu et al. They fabricated Ag NFs by electroless depositing Ag on the transparent substratecollected NF templates. To maintain the high conductivity and transparency of the Ag NF meshes, selectively depositing Ag on the templates is necessary. Thus, they used hydrophobic materials as substrate and preformed Ag nanoseeds on the templates. [18] However, both the morphology of Ag nanoseeds and the Ag deposition time still need to be elaborately optimized. More recently, solution-processed metal NF meshes have been used in the flexible devices, such as transistors, [28] organic lightemitting diodes, [29] transparent heaters, [30,32,33] energy storage devices, [34] and sensors. [35] Importantly, considering the distinctive metal nanoparticle-stacked structure, the electromechanical stability of the electroless deposited metal NF mesh has to be improved.Here, we present an alternative stretchable transparent conductor based on serpentine silver NF mesh by exploiting chemical plating and electrospinning. We use microrough copper foils as electrospun cathode to collect uniform and transferrable polyvinyl butyral (PVB) NF meshes. Transferring the flexible polymer NF meshes to the prestrained Metal fiber nanomeshes, fabricated by depositing metals on the electrospun nanofiber templates, have come into the spotlight as promising stretchable transparent conductors. However, most currently stretchable metal fibers are produced via expensive vacuum deposition methods. This work reports a low-cost approach to prepare transparent, conducting, and serpentine silver nanofiber mesh elastomers (SNME). The key of forming SNME is buckling the electrospun polymer nanofiber templates into wavy stru...

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“…[4] Recently, it has been reported that the Ag fiber electrode produced by the electrospinning process has a long length and a reduced surface roughness. [5] However, it is difficult to control the surface roughness completely, and therefore, it has limitations in the transmittance and sheet resistance.…”

Section: Objective and Backgroundmentioning

confidence: 99%

P‐211: Late‐News Poster: Extremely Smooth Electrospun Ag Fiber Electrodes Embedded in PVB Flexible Substrate for Organic Light‐Emitting Diodes

Kim

Choi

2019

Symp Digest of Tech Papers

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We purposed to fabricate an organic light-emitting device (OLED) using an Ag fiber electrode embedded in a polyvinyl butyral (PVB) substrate. Since the electrode is embedded in a flexible polymer substrate, the surface roughness is very low. Moreover, since the depth of the electrode can be freely adjusted, the resistance can be very low without decreasing the transmittance. As a result, we demonstrated that a OLED with external quantum efficiency of 10 % was successfully fabricated.

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Junction‐Free Electrospun Ag Fiber Electrodes for Flexible Organic Light‐Emitting Diodes

Cited by 45 publications

References 32 publications

Highly Efficient (>10%) Flexible Organic Solar Cells on PEDOT‐Free and ITO‐Free Transparent Electrodes

Highly Efficient (>10%) Flexible Organic Solar Cells on PEDOT‐Free and ITO‐Free Transparent Electrodes

Solution‐Grown Serpentine Silver Nanofiber Meshes for Stretchable Transparent Conductors

P‐211: Late‐News Poster: Extremely Smooth Electrospun Ag Fiber Electrodes Embedded in PVB Flexible Substrate for Organic Light‐Emitting Diodes

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