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Electrical Characteristics and Annealing Effect on Al/n-GaSb Schottky Diode Doped Using DMTe Ari Handono Ramelan; Harjana Harjana; Pepen Arifin; Ewa Goldys
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

The electrical properties of Al/n-GaSb Schottky diodes, doped with 1.4 × 1018 cm−3 (tellurium) were examined.  C-V (capacitance-voltage) measurements at 300 K show barrier heights of 0.63 eV, compared to 0.59 eV determined from room temperature I-V (current-voltage)  measurements. The voltage and frequency dependence on the capacitance is due to the ideality factor of the Schottky barrier and due to a high series resistance.  At low frequency the measured capacitance is dominated by the depletion capacitance of the Al/n-GaSb Schottky diode which is bias-dependent and frequency-dependent. The diode shows a strong temperature dependence of ideality factor from approximately 3.6 at room temperature to as high as 6.7 at 140 K.  There may be a small portion of the device nonideality attributable to generation-recombination currents due to deep levels in GaSb. The barrier height decreased from 0.57 eV to 0.35 eV for the sample annealed at 300oC for 1 minute.
OPTIMIZING OF TiO2 SEPARATION FROM BANGKA ILMENITE BY LEACHING PROCESS USING HCl Wahyuningsih, Sayekti; Hidayatullah, Hari; Pramono, Edi; Rahardjo, Sentot Budi; Ramelan, Ari Handono; Firdiyono, Florentinus; Sulistiyono, Eko
Alchemy Jurnal Penelitian Kimia Vol 10, No 1 (2014)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

Separation of titanium dioxide (TiO2) from ilmenite Bangka has been done byleaching processusing HCl. Before the leaching process, ilmenite was roastedat 900oC for pre-oxidation (preliminary - oxidation). Leaching process carried out by variation of HCl concentration and Fe0reducing agents. While the re-deposition of dissolved Ti4 +ionachieved by hydrolysis - condensation using 2- propanol - H2O solvents.Leaching the pre-oxidazed ilmenite shows the phase change of  pseudobrokite (Fe2TiO5 ) into hematite ( Fe2O3) and synthetic rutile ( TiO2 ). Formation of the synthetic rutile was characterized by the loss of intensity of Fe2TiO5 at 26.65 º and the increasing intensity of rutile TiO2 at 27.49 º.The dissolution rate of both titanium and iron wasfound to be increased, generally, by increasing acid concentration in case of HCl as well as by increasing ilmenite:Fe0 ratio. Precipitation ofthe dissolved titania with 2-propanol -H2Oof 8:2(v /v) produced anataseTiO2 due to the hydrolysis and condensation of Ti-tetraisopropoxide complexes.
Optimasi Parameter Sintesis Nanopartikel TiO2 untuk Dye Sensitized Solar Cell Amalia Puji Winarni; Kusumandari Kusumandari; Ari Handono Ramelan
Jurnal Fisika dan Aplikasinya Vol 10, No 2 (2014)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (269.931 KB) | DOI: 10.12962/j24604682.v10i2.812

Abstract

Penelitian ini bertujuan untuk mengoptimalisasi struktur nano partikel TiO2 sebagai upaya meningkatkan performa Dye Sensitized Solar Cell (DSSC). Sintesis TiO2 menggunakan metode sol-gel dengan variasi waktu proses aging 6 dan 7 hari serta temperatur kalsinasi 550C dan 650C. Dari pengujian XRD diperoleh bahwa sampel TiO2 550C- 7hari memiliki ukuran butir terkecil yaitu 10,30 nm dengan fase anatase. Sedangkan sampel TiO2 650C- 6 hari memiliki ukuran butir terbesar yaitu 15,69 nm dengan struktur bi-fase anatase-rutile. Dari pengujian dengan I-V meter Keithley diperoleh hasil efisiensi terbesar pada sampel TiO2 650C- 7 harisebesar 0,09% dan terkecil pada sampel TiO2 550C- 6 hari sebesar 0,012%.
Sintesa Titanium dioxide (TiO2) untuk Dye-Sensitized Solar Cell dengan Antosianin Bunga Rosella (Hibiscus sabdariffa) Adhitya, Elsa Ayu; Ramelan, Ari Handono; S, Suharyana
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 3, No 02 (2013): IJAP VOLUME 03 ISSUE 02 YEAR 2013
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v3i02.1268

Abstract

Synthesis of titanium dioxide (TiO2) for dye sensitized solar cell (DSSC) with anthocyanins rosella (Hibisccus Sabdariffa) has succesfully been done using sol-gel technique. The semiconductor layer is a very important part of the DSSC since it gives a high surface area for dye absorption which gives rise to high currents. DSSC was formed structually two electrodes sandwiching the electrolyte. The working electrode is TiO2 layer coating on a Fluorine doped Tin Oxide (FTO) glass substrat and sensitified with anthocyanin dye. A counter electrode is carbon coating on the FTO. The fabricated solar cells have an area of 1.5 cm2, soaked in the anthocyanin dye for 24 hours and 48 hours. The sample was characteriz with X-ray diffraction method. The X-ray diffractogram indicates that the sample possesses rutile and anatase phase. The dye absorption measured using spektrofotometer UV-Visible Lambda 25 showed theabsorption occurs in the range 440-620 nm. The efficiencies of the solar cells measured by I-V meter Keithley for 24 and 48 hours soaking are 0.0064(6)%, and 0.0151(4)%, respectively.
Aplikasi Geolistrik Resistivitas Konfigurasi Wenner-Schlumberger untuk Pemetaan Sebaran Leachate di Sekitar TPA Putri Cempo Surakarta Chiranjeevi Nugroho; D Darsono; Ari Handono Ramelan
Jurnal Fisika dan Aplikasinya Vol 14, No 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (692.509 KB) | DOI: 10.12962/j24604682.v14i1.2864

Abstract

Mapping leachate’s distribution using geoelectrical resistivity has been done at Plesungan village, Gondang Rejo, Karanganyar regency. Acquisition using Wenner-Schlumberger configuration with space of the smallest electrode is 15 meters away. This research using resistivitymeter OYO McOHM-EL for current injection and measure the potential difference. Inversion process using Res2dInv software for 2 dimensions model and RockWorks16 software for 3 dimensions model. The location of the research has geology old alluvium with characteristics conglomerate, sandstone, silt and clay. Leachate mapping estimated resistivity value <5.55 ohm meter with the direction away from the final disposal site where the main constituent of reseach sites is clay.
Hubungan Sifat Optik terhadap Performa Kinerja Sel Surya DSSC Transparan Berbahan Dye DN-F01 sebagai Sensitizer Agus Supriyanto; Ari Handono Ramelan; Mohd Khairul Bin Ahmad; Febrina Ramadhani; Diani Galih Saputri
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 2 (2020): IJAP Volume 10 ISSUE 02 YEAR 2020
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v10i2.46261

Abstract

Dye sensitized solar cell (DSSC) is the third generation of solar cells that currently developing by researchers to get the best performance. The selection of dye as a component of DSSC has a big influence in the light absorption process. In this study, DN-F01 organic dye was used as a sensitizer with various concentrations. The optical properties test was carried out on the DN-F01 dye solution by UV-Vis spectrophotometer (Shimadzu UV-1800) and the DSSC fabricated performance was tested by portable solar simulator (ORIEL Sol1A). From the results, the DN-F01 absorbance has ability to absorb light in the 300-500 nm wavelength range. The greatest efficiency value in this research is 2.44% obtained from the sample was immersed with the largest concentration of dye DN-F01 which has the smallest band gap energy of 2.38 eV.