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Prodi Sarjana dan Pascasarjana Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Institut Teknologi Bandung Gedung Fisika, Jalan Ganesa 10, Bandung 40132, INDONESIA
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INDONESIA
Indonesian Journal of Physics (IJP)
Published by Institut Teknologi Bandung
ISSN : 23018151     EISSN : 29870828     DOI : https://doi.org/10.5614/itb.ijp
Core Subject : Science, Engineering,
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering
Indonesian Journal of Physics welcomes full research articles in the area of Sciences and Engineering from the following subject areas: Physics, Mathematics, Astronomy, Mechanical Engineering, Civil and Structural Engineering, Chemical Engineering, Electrical Engineering, Geotechnical Engineering, Engineering Science, Environmental Science, Materials Science, and Earth-Surface Processes. Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 334 Documents
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Application of a-Si:H in p-i-n Solar Cell by VHF-PECVD Method I. Usman; A. Supu; Mursal Mursal; Sukirno, T. Winata; M. Barmawi
Indonesian Journal of Physics Vol 15 No 2 (2004): Vol. 15 No.2, April 2004
Publisher : Institut Teknologi Bandung

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Abstract

The a-Si:H p-i-n solar cells have been deposited on Corning glass coated with Transparent Conductive Oxide (TCO) by employing the VHF-PECVD method at the substrate temperature of 275 oC. The 10% SiH4 gas diluted in H2 was used as a gas source and the doping process was done by gas admixture of B2H6 and PH3 for p- and n-layer respectively. A careful mono-layer optimization such as power discharge and deposition pressure was done to obtain the best a-Si:H film quality. The deposition rate (rd), optical bandgap (Eopt), and photoconductivity (σph) of i-layer was obtained are 2.04 Å/s, 1.69 eV, and 9.23 x 10-5 S/cm, respectively. Two different solar cells were then fabricated by applying the active layer (i-layer) of 4400Å and 5500Å thickness, while the thicknesses of p- and n-layer were fixed to 150Å and 300Å respectively. The current-voltage measurement under 34 mW/cm2 light illumination shows higher value of VOC, ISC, and efficiency which are of 0.77 Volt, 15.92 mA/cm2, and 9.39%, respectively for the solar cell with thicker i-layer of 5500Å.
Study of Structural and Electrical Properties of Gallium Arsenide Thin Film Grown by MOCVD Using Trisdimethylamino Arsenic I. Hamidah; N. Yuningsih; P. Arifin; M. Budiman; M. Barmawi
Indonesian Journal of Physics Vol 15 No 2 (2004): Vol. 15 No.2, April 2004
Publisher : Institut Teknologi Bandung

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Abstract

Trisdimethylamino Arsenic (TDMAAs) and trimethyl gallium (TMGa) have been successfully used as Arsenic (As) and gallium (Ga) precursors, respectively, for GaAs epitaxial layers growth by metal organic chemical vapor deposition (MOCVD) method. TDMAAs is used as As precursor due to its excellent properties, i.e. nontoxic, low carbon incorporation, low vapor pressure, and no need for precracking. The surface morphology of GaAs is observed by scanning electron microscopy (SEM) method and GaAs atomic fraction is measured by energy dispersive X-ray (EDX) method. From the examination of electrical properties by the standard Hall-van der Pauw measurement, it can be concluded that the film conductivity for all layers are p-type. GaAs with V/III ratio of 4.5 has a growth rate of 0.94 µm/h, mobility of 395 cm2/Vs and room temperature hole concentration of 3.44 x 1015 cm-3
Growth of Amorphous Silicon Germanium (a-SiGe:H) Alloys Thin Film by PECVD Mursal Mursal; A. Supu; I. Usman; T. Winata; Sukirno Sukirno; M. Barmawi
Indonesian Journal of Physics Vol 15 No 2 (2004): Vol. 15 No.2, April 2004
Publisher : Institut Teknologi Bandung

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Abstract

Hydrogenated amorphous silicon-germanium (a-SiGe:H) alloys thin films had been grown by Plasma Enhanced Chemical Vapor Deposition (PECVD) method. The films were grown on corning glass # 7059 from a gas mixture of silane (SiH4) and germane (GeH4) 10% diluted in hydrogen (H2). UV-VIS-NIR spectra analysis of a-SiGe:H alloys thin films showed that the sub-bandgap absorption α(hν) spectra of a-SiGe:H alloys shift to lower photon energy with increasing in GeH4 flow rate. The optical bandgap of a-SiGe:H alloy decreased non linearly from 0.94 eV – 0.75 eV with increasing in GeH4 flow rate from 2.5 sccm – 25 sccm. The photo-sensitivity (σph/σd) of a-SiGe:H thin films were improved as the optical bandgap (Eopt) increased.
Optimization of small and very small long life Pb-Bi Cooled Fast reactors Zaki Su’ud
Indonesian Journal of Physics Vol 15 No 2 (2004): Vol. 15 No.2, April 2004
Publisher : Institut Teknologi Bandung

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Abstract

In this paper optimization of small and very small nuclear power plant is discussed. The reactor is subjected to fulfill fourth generation nuclear power plant criteria. For very small nuclear power reactor, constraining the reactivity swing to be smaller than one dollar during operation usually result in small power density, relatively large core and low burnup level. One key concept in the present discussion is by the use of tight lattice and large fuel diameter so that the fuel volume fraction becomes large and pressure drop is still reasonable. The central part of the core is filled by fertile material for minimization of excess reactivity during reactor operation. By using this concept small but effective nucclear power plant can be designed. The core can achieve burnup of about 13 % heavy metal and the height and diameter of the active core is much smaller than 1 meter.
Two percolations model for conductivity-salt concentration in PVC-LiPF6 system R.H.Y. Subban; M.Z.A. Yahya; R. Puteh; A.K. Arof
Indonesian Journal of Physics Vol 15 No 3 (2004): Vol. 15 No. 3, July 2004
Publisher : Institut Teknologi Bandung

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Abstract

Lithium hexafluorophosphate (LiPF6) doped polyvinyl chloride (PVC) polymer electrolytes were prepared by the solution cast technique. LiPF6 has been claimed as the best salt for use in electrolytes for lithium ion batteries. In this work, 1.0 g of PVC and 1.0 g of LiPF6 were dissolved in tetrahydrofuran (THF). The LiPF6 was then substituted with LiCF3SO3 in different weight percentages. The solutions were cast in different petri dishes and left to form films at room temperature. The films were kept in a dessicator for a period of one week to ensure complete dryness. Impedance spectroscopy was used to obtain the bulk resistance from which the conductivity was calculated. The conductivity-salt concentration graph showed two peaks at 0.2g LiCF3SO3 and 0.8 g LiCF3SO3. In glasses, the conductivity is due to the conduction of cations, but in polymers both anions and cations are conducting. In some cases, the transference number of anions is greater than that of the cations. In most cases, the conductivity-salt concentration graph shows only one peak. In such observation, increase in conductivity is explained by the increase in number of free mobile ions and the decrease in conductivity is attributable to ion reassociation. The results in this work cannot be satisfactorily explained by the above mechanism. The two salient peaks observed maybe plausibly explained by the two percolations model in which both positive and negative ions contribute to the conductivity. The first peak is attributed to the lithium ions and the second peak is attributed to the PF6- and CF3SO3- ions. This is also in accordance to the results from transient ionic current experiments, which indicate that the cations have a higher mobility than anions.
Investigation on PVDF Based Solid Polymer Electrolytes for Rechargeable Lithium Batteries N.S. Mohamed; S.A. Hashim Ali; A.K. Arof
Indonesian Journal of Physics Vol 15 No 3 (2004): Vol. 15 No. 3, July 2004
Publisher : Institut Teknologi Bandung

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Abstract

Solid polymer electrolytes consisting of PVDF and LiCF3SO3 plasticized with different amounts of EC plasticizer were prepared by solution casting method. The addition of plasticizer significantly improved the ionic conductivity. The temperature dependence of ionic conductivity of the plasticized PVDF film follows VTF empirical form, i.e the migration of ions depends mainly on the segmental movements of the polymer chain in the amorphous region. The characteristics of the cell employing the highest conducting system are also presented in this paper.
Dependence of Ga1-xMnxN Thin Films Growth on Substrate Temperature in Vertical MOCVD Reactor by Numerical Simulation Budi Mulyanti; Fitri S. Arsyad; P. Arifin; M. Budiman; Sri Jatno W; M. Barmawi
Indonesian Journal of Physics Vol 15 No 3 (2004): Vol. 15 No. 3, July 2004
Publisher : Institut Teknologi Bandung

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Abstract

Growth of Ga1-xMnxN thin film in the vertical MOCVD (Metal Organic Chemical Vapor Depositions) reactor as a function of substrate temperature is analyzed by numerical simulation. Gases that are used as a source of Ga, N and Mn are trimethylgallium (TMGa), nitrogen (N2) and cyclopentadienyl manganese tricarbonyl (CpMnTc), respectively. Hydrogen (H2) is used as a carrier gas for both TMGa and CpMnTc. The objective of simulation is to obtain an optimal growth parameter, in which the growth rate is high and uniform. From the simulation results, it can be concluded that to achieve a highest growth rate, the substrate temperature should be maintained at about 1173 K and with this temperature the growth rate is nearly constant when the susceptor radial distance is between 3.5 cm and 4.5 cm.
Stretching hydrolysis in LiI-Li2WO4-Li3PO4 by infrared spectroscopy A.H. Ahmad; M.Z.A. Yahya; R. Puteh; A.K. Arof
Indonesian Journal of Physics Vol 15 No 3 (2004): Vol. 15 No. 3, July 2004
Publisher : Institut Teknologi Bandung

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Abstract

Infrared spectroscopy is a useful tool to probe the formation of polyhedral structures in alkali halide-oxysalts. LiI-Li2WO4- Li3PO4 is an example of alkali halide-oxysalt. These materials have been proposed as superionic materials for use as electrolytes in electrochemical devices. One of the pertinent problems in lithiated superionic materials is their hygroscopic property that can seriously affect the conductivity of the materials. In the present work, LiI-Li2WO4- Li3PO4 has been prepared by the sintering method in order to ensure removal of water from the samples. Fourier Transform Infrared (FTIR) spectra show that the band at 1634 cm-1 due to lithium tungstate, the band at 1628 cm-1 due to lithium iodide has overlapped to form a single band at around 1640 cm-1. The two bands at 1050 and 590 cm-1are assigned to pure lithium phosphate. The FTIR spectrum of the ternary system is almost similar to that of the binary system and they are quite similar to the spectrum of lithium tungstate. FTIR shows there is a strong broad band centered at 3400 cm-1 in the binary sample but the band decreases in width on addition of Li3PO4. This band is an indication of stretching hydrolysis. A medium band is also observed at 1505 cm-1, which is due to H-O-H bending motion This band almost disappears as the amount of Li3PO4 is increased to 30 wt.%. These results indicate that with further treatment the sample LiI-Li2WO4- Li3PO4 has potential for use in lithium batteries.
Design Study on Ship Based Small Nuclear Power Reactors Zaki Su'ud; Dian Fitriyani
Indonesian Journal of Physics Vol 15 No 3 (2004): Vol. 15 No. 3, July 2004
Publisher : Institut Teknologi Bandung

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Abstract

The results of conceptual design study on ship based small nuclear power reactors are presented. The reactors are basically lead-bismuth cooled fast power reactors with long refueling interval and low reactivity swing. Here we optimized the designs to achieve the feasibility to be operated under sea wave movement. The system use loop type with relatively large coolant pipe above reactor core. The reactors do not use IHX, so that the heat from primary coolant system directly transferred to water-steam loop through steam generator. The reactors are capable to be operated in difference power level during night and noon. This feature is necessary because in some rural area the main use of the reactors is just to support home electricity. The reactors however can also be used totally or partially to produce clean water through desalination of seawater. Due to the influence of sea wave movement the analysis have to be performed in three dimensional analysis. We found that the effect of the seawater movement is significant in changing flow pattern distribution and outlet temperature distribution.
Electrical Properties of Fatty Acid in Salted Chitosan Membranes M.Z.A. Yahya; R. Puteh; A.K. Arof
Indonesian Journal of Physics Vol 15 No 4 (2004): Vol. 15 No. 4, October 2004
Publisher : Institut Teknologi Bandung

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Abstract

Films of chitosan polymer doped with lithium acetate (LiOAc) and placticized with oleic acid (OA) and palmitic acid (PA) were prepared by the solution cast technique. Impedance spectroscopy and XRD techniques have been used for the analysis. The film containing 40 wt.% LiOAc and 10.0 wt.% of OA exhibit a room temperature conductivity of ~ 10-5 S cm-1 and the film containing 41.0 wt.% LiOAc and 7.7 wt.% of PA has conductivity ~ 10-6 S cm-1. The plot of ln(σT) versus 103/T for the highest conducting samples obey an Arrhenian relationship in the temperature range between 300 and 363 K implying that the conductivity is thermally assisted. From conductivity-temperature studies the samples with high conductivity has low activation energies and vice-versa. The materials are ion conductors and the complex modulus formalism is further proof that the materials are ionic conductors.

Page 11 of 34 | Total Record : 334

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