Judul: Analysis of Saturation Current, Barrier  Voltage, and Electron Mobility of Ferium-Doped Barium Titanate Thin Films
Abstrak: Perkembangan teknologi khususnya elektronika gencar dilakukan untuk menciptakan inovasi devais berukuran kecil dengan performa yang maksimal, seperti film tipis. Film tipis Barium Titanat (BaTiO3) didadah Ferium dengan variasi konsentrasi pendadah (0%; 0,5%; dan 1%) berhasil dibuat. Larutan sampel disaring menggunakan filter PVDF kemudian dideposisi menggunakan metode chemical solution deposition (CSD) di atas substrat silikon tipe-p (100) dengan teknik spin coating pada kecepatan putar 3000 rpm selama 60 detik. Proses annealing dilakukan pada suhu 850°C dan ditahan selama 8 jam. Berdasarkan pengujian I-V meter, film tipis memiliki karakteristik dioda dan responsif terhadap perubahan intensitas iradiasi cahaya. Peningkatan intensitas iradiasi cahaya menyebabkan nilai arus saturasi meningkat namun nilai potensial penghalang menurun. Mobilitas elektron Barium Titanat pada konsentrasi pendadah Ferium 0%, 0,5%, dan 1% didapatkan berturut-turut 2,02×10-6cm2/Vs, 3,16×10-6cm2/Vs, dan 3,03×10-6cm2/Vs. Hasil sifat listrik ini menunjukkan bahwa film tipis BaTiO3 didadah Fe berpotensi sebagai sensor cahaya., The development of technology, especially in electronics, is actively pursued to create innovative devices that are small in size yet deliver maximum performance, such as thin films. Ferium-doped Barium Titanate (BaTiO3) thin films with varying dopant concentrations (0%, 0,5%, and 1%) have been successfully fabricated. The sample solution was filtered using a PVDF filter and then deposited on p-type silicon (100) substrates using the chemical solution deposition (CSD) method with spin coating technique at a spin speed of 3000 rpm for 60 seconds. The annealing process was performed at a temperature of 850°C and held for 8 hours. Based on I-V meter testing, the thin films exhibited diode characteristics and were responsive to changes in light irradiation intensity. Increasing the intensity of light irradiation resulted in an increase in saturation current while the barrier potential decreased. The electron mobility of Barium Titanate with Ferium dopant concentrations of 0%, 0,5%, and 1% were found to be 2,02×10-6cm2/Vs, 3,16×10-6 cm2/Vs, and 3,03×10-6cm2/Vs, respectively. These electrical properties indicate that Fe-doped BaTiO3 thin films have the potential to be used as light sensors.
Keyword: Barium Titanate, CSD, Dopant, I-V meter, Thin films

Judul: Optical Properties and Crystal Structure  of Ferrum-doped Barium Titanate (BaTiO3) thin film.
Abstrak: Film tipis Barium Titanat didadah Ferrum telah berhasil disintesis menggunakan metode chemical solution depositioni (CSD) dan teknik spin coating. Film dibuat dengan mendeposisikan laruta kimia 2M pada substrat Si (100) tipe-p, lalu diputar menggunakan piringan spin coater pada kecepatan 3000 rpm dalam waktu 60 detik dan proses pendeposisian ini dilakukan sebanyak 5 kali. Sifat optik berdasarkan karakterisasi UV-Vis menunjukkan bahwa semakin tinggi konsentrasi Ferrum di dalam film Barium Titanat (0%; 0,5%; 1%) nilai reflektansinya akan semakin meningkat dan nilai band gap yang diperoleh menurun dari 2,8 eV – 2,4 eV. Jarak antara fonon optik longitudinal dan optik transversal mengecil seiring bertambahnya konsentrasi Ferrum. Hasil karakterisasi XRD menunjukkan parameter kisi yang menurun seiring dengan meningkatnya konsentrasi Ferrum di dalam film Barium Titanat, karena jari-jarik ionik atom Ferrum (0,77 Å) lebih kecil dibandingkan jari-jari Barium (1,36 Å)., Fe-doped Barium Titanate thin film in has been successfully synthesized using chemical solution deposition (CSD) method and spin coating technique. The film was made by depositing a 2M chemical solution on a p-type Si(100) substrate, then spin it using a spin coater plate at 3000 rpm for 60 seconds and this deposition process was carried out 5 times. The optical properties based on UV-Vis characterization show that the higher the concentration of Ferrum in the Barium Titanate film (0%; 0,5%; 1%) the reflectance value will increase and the band gap value decrease from 2,8 eV – 2,4 eV. The distance between the longitudinal and transverse optical phonons decrease on increasing the concentration of Ferrum. The XRD characterization results show that the lattice parameters decrease on increasing Ferrum concentration in the Barium Titanate film, because the ionic radius of the Ferrum atom (0,77 Å) is smaller than that of Barium atom (1,36 Å).
Keyword: barium titanat, energi bandgap, mode fonon, parameter kisi, bandgap energy, barium titanate, lattice parameters, phonon mode

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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