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All Journal Jurnal Teknologi Terapan Makara Journal of Technology International Journal of Electrical, Computer, and Biomedical Engineering (IJECBE) Jurnal Sains Materi Indonesia
Arief Udhiarto
Universitas Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology

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PENGARUH VARIASI SUHU LAMINATING, WAKTU ULTRASONIC CLEANING, KECEPATAN ROTASI SPIN COATING TERHADAP KARAKTERISASI ORGANIC LIGHT EMITTING DIODE (OLED) Khoerun, Bobi; Udhiarto, Arief
Jurnal Teknologi Terapan Vol 5, No 2 (2019): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (658.101 KB) | DOI: 10.31884/jtt.v5i2.205

Abstract

Organic Light Emitting Diode (OLED) merupakan divais fotonik yang tersusun dari katoda sebagai sisi negatif, anoda sebagai sisi positif, dan sebuah lapisan emissive dari bahan organik yang dapat memancarkan cahaya ketika penghantar diberi arus listrik. Karakteristik arus yang dibutuhkan harus sesuai dengan karakteristik tahanan sehingga dapat menghasilkan fabrikasi OLED yang optimal. Teknik laminasi merupakan salah satu teknik yang digunakan dalam pembuatan Organic Light Emitting Diode (OLED) dengan cara menempatkan struktur OLED pada plastik laminasi. Tahun 2015, Adnan Fatahillah Afiff [1] memfabrikasi Organic Light Emitting Diode (OLED) menggunakan teknik laminasi tetapi hasil fabrikasi belum dapat memancarkan cahaya. Ada beberapa hal yang mempengaruhi karakterisasi OLED saat fabrikasi yaitu suhu laminating, waktu ultrasonic cleaning, dan kecepatan rotasi spin coating. Ketiga faktor tersebut akan mempengaruhi karakteristik arus yang dihasilkan dan dapat memaksimalkan fabrikasi OLED. Oleh karena itu diperlukan penelitian terkait pengaruh ketiga faktor tersebut terhadap karakteristik arus listrik pada OLED. Langkah-langkah yang dilakukan adalah menggunakan teknik laminasi dan memvariasikan waktu ultrasonic cleaning, kecepatan rotasi spin coating, dan suhu laminating. Arus listrik yang mengalir pada Organic Light Emitting Diode OLED dapat mencapai nilai paling tinggi pada saat waktu ultrasonic cleaning selama 15 menit, suhu laminating sebesar 130o C, dan kecepatan rotasi spin coating 4500 rpm.
Observation of Photovoltaic Effect and Single-photon Detection in Nanowire Silicon pn-junction Udhiarto, Arief; Purwiyanti, Sri; Moraru, Daniel; Mizuno, Takeshi; Tabe, Michiharu
Makara Journal of Technology
Publisher : UI Scholars Hub

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Abstract

We study nanowire silicon pin and pn-junctions at room and low temperature. Photovoltaic effects are observed for both devices at room temperature. At low temperature, nanowire pn-junction devices show their ability to detect single photon. This ability was not been observed for pin devices. Phosphorus-boron dopant cluster in the depletion region is considered to have the main role for single-photon detection capability. Fundamental mechanism of dopant-based single-photon detection in nanowire pn-junction is described in details.
Observation of Tunneling Effects in Lateral Nanowire pn Junctions Purwiyanti, Sri; Udhiarto, Arief; Moraru, Daniel; Mizuno, Takeshi; Hartanto, Djoko; Tabe, Michiharu
Makara Journal of Technology Vol. 18, No. 2
Publisher : UI Scholars Hub

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Abstract

As electronic device dimensions are continuously reduced, applied bias conditions significantly change and the transport mechanisms must be reconsidered. Tunneling devices are promising for scaled-down electronics because of expected high-speed operation and relatively low bias. In this work, we investigated the tunneling features in silicon-oninsulator lateral nanowire pn junction and pin junction devices. By controlling the substrate voltage, tunneling features can be observed in the electrical characteristics. We found that the minimum substrate voltage required for tunneling to occur in pn junctions is higher as compared with pin junctions. The main cause of these effects relies in the difference between the doping profiles, since the pn junctions contain a co-doped region, while the pin junctions contain an i-layer.
Fabrication of Organic Light Emitting Diodes (OLEDs) using the Lamination method in a Vacuum-Free Environment Alfafa, Daris; Moraru, Daniel; Udhiarto, Arief
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 1 No. 2 (2023)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v1i2.24

Abstract

Organic Light Emitting Diodes (OLEDs) have recently become one of the fastest-growing technologies in the world. The challenge in OLED fabrication, especially larger-area OLEDs, is its relatively high costs and complexity. The lamination method at a vacuum-free environment is an approach to simplify and reduce the cost of fabrication. This paper reports our latest progress on OLEDs fabricated using the said method and condition. The processing parameters were explored and optimized. Spin coating the emissive Layer (PFO) at 1300 rpm and the anode (TC-07-S) at 3000 rpm yield the best results in terms of current conduction and success rate. Laminating the OLEDs at 160 °C, with 245 N of force, and for 30 seconds, gave the best results in terms of previously stated parameters. Furthermore, the constituting materials of the OLEDs were explored. It was found that TC-07-S as an anode, PFO as the light-emitting material, a 30-micrometer thick aluminum foil as the cathode, and Kapton as the dielectric and adhesive material yielded the best results. These results may pave the way for other innovative methods to fabricate OLEDs with a simple and affordable processes.
Glucose Detection Using a Surface Plasmon Resonance Biosensor Functionalized by Glucose Oxidase Atikah Qonitah; Arief Udhiarto; Sabar Pambudi; Ratno Nuryadi; Lia Aprilia
Jurnal Sains Materi Indonesia Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2026.12209

Abstract

Surface plasmon resonance (SPR) is a well-established optical method for biosensing, allowing real-time monitoring of biomolecular interactions without the need for labeling. In this study, an SPR biosensor was designed for glucose detection by modifying a gold thin film with a self-assembled monolayer (SAM) of 16-mercaptohexadecanoic acid (16-MHA). The SAM layer was chemically activated using (1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride /N-hydroxysuccinimide (EDC/NHS), enabling covalent attachment of glucose oxidase (GOx) for selective interaction with glucose molecules. The sensor was tested with glucose solutions at various concentrations (100–300 mM) and corn syrup, which contains both glucose and fructose, to evaluate selectivity. Detection relied on measuring shifts in the resonance angle of the attenuated total reflection curve, which reflects changes in the local refractive index. The sensor exhibited a clear linear correlation between glucose concentration and resonance angle shift, indicating high sensitivity. In contrast, corn syrup produced much smaller shifts, confirming the selectivity of the biosensor due to GOx’s specificity for β-D-glucose. Performance evaluation showed higher sensitivity (S), narrower full width at half maximum (FWHM), and superior figure of merit (FOM) for glucose compared to corn syrup. These results highlight the potential of SPR for reliable and selective glucose detection in biomedical fields.
Implementation and Hardware-Level Validation of a 36 V BLDC Motor Drive Using Artix-7 FPGA Rafi Kamil Arief; Fajar Rahino Triputra; Arief Udhiarto
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 4 No. 1 (2026)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v4i1.244

Abstract

This paper presents an Artix-7 FPGA-based implementation and validation of a 36 V BLDC motor drive for open-loop no-load operation. The proposed controller combines Hall-sensor sixstep commutation, counter-based PWM generation, bidirectional phase sequencing, and deadtime-protected gate output logic in programmable hardware. The study emphasizes hardwarelevel validation, including the consistency of Hall-sector decoding, PWM scaling, and inverter output behavior, rather than closed-loop speed regulation. The design was verified using Verilog simulation and experimentally tested with a three-phase inverter, a 20 kHz PWM carrier, and a 10 - bit duty cycle. The measurements confirmed the expected PWM-driven phase, low-side return path, and floating phase behavior for adjacent Hall states. No-load characterization was then performed in both clockwise and counterclockwise directions. The measured speed increased almost linearly with duty cycle and reached approximately 2425 r/min at full duty cycle, while the supply current increased to about 0.49 A. The minimum start duty was 2% in both directions, and the minimum sustain duty was 1.8% and 1.7% for clockwise and counterclockwise rotation, respectively.
Co-Authors Alfafa, Daris Anak Agung Ngurah Gde Sapteka Atikah Qonitah Daniel Moraru Daniel Moraru Djoko Hartanto Fajar Rahino Triputra Harry Sudibyo Hoang Nhat Tan, Hoang Nhat Khoerun, Bobi Lia Aprilia Michiharu Tabe Michiharu Tabe Mohammad Ali Tamam Rafi Kamil Arief Ratno Nuryadi Ratno Nuryadi Ryousuke Unno, Ryousuke Sabar Pambudi Sri Purwiyanti Takeshi Mizuno Takeshi Mizuno