Judul: DFT Study on the Effect of In Vacancy-Point Defect and Ag+ Doping on Properties of Cs2ScInCl6 Double Perovskite as Solar Cell Candidate
Abstrak: Perkembangan konsumsi energi global yang terus meningkat mendorong pemanfaatan sumber energi terbarukan seperti energi matahari dalam transformasi menjadi energi listrik, seperti teknologi fotovoltaik dinamakan sel surya. Pemanenan energi surya dengan teknologi ini dapat menggunakan Double Perovskite (DP) sebagai material yang dapat menyerupai kinerja perovskit berbasis timbal (Pb). Akibat Pb yang memiliki permasalahan dari sisi toksisitasnya, kemudian dilakukan uji DP Cs2ScInCl6 dengan mengeksplorasi sifat elektronik dan optiknya secara komputasi menggunakan DFT. Selain itu, untuk mendapat perbaikan performansi dapat dilakukan dengan memodifikasi strukturnya berupa pengadaan vacancy-point defect (x = 0,25) dan kombinasi vacancy-point defect dan doping ion Ag+ serta variasi metode Spin Orbit Coupling (SOC) dan tanpa SOC. Cs2ScIn1-0,25Cl6 tanpa SOC memiliki performansi yang baik ditinjau dari sifat elektroniknya. Sedangkan ditinjau dari keseluruhan terlepas dari transisinya Cs2ScIn1-0,25Ag0,25Cl6 tanpa SOC memberikan performansi paling baik sebagai kandidat sel surya DP Cs2ScInCl6 dilihat dari gap-nya yang berkaitan dengan kemampuan absorbsi foton dengan spektrum yang lebar., The development of global energy consumption that continues to increase encourages the use of renewable energy sources such as solar energy in the transformation into electrical energy, such as photovoltaic technology called solar cells. Solar energy harvesting with this technology can use Double Perovskite (DP) as a material that can resemble the performance of lead-based perovskite (Pb). As a result of Pb which has problems in terms of toxicity, then the DP Cs2ScInCl6 test was carried out by exploring its electronic and optical properties computationally using DFT. In addition, to get improved performance can be done by modifying the structure in the form of procurement vacancy-point defect (x = 0,25) and a combination of vacancy-point defect and doping ion Ag+ and variations of Spin Orbit Coupling (SOC) and no SOC methods. Cs2ScIn1-0,25Cl6 without SOC has good performance in terms of its electronic properties. While in terms of overall regardless of the transition Cs2ScIn1-0,25Ag0,25Cl6 without SOC gives the best performance as a candidate DP solar cell Cs2ScInCl6 seen from itsgap related to the absorption ability of photons with a wide spectrum.
Keyword: Bandgap, DFT, Double Perovskite, Transition, Vacancy-Point

Judul: Synthesis and Characterization of Bulk- Heterojunction Hybrid Solar Cell Components Based on P3OT:PbS QDs
Abstrak: Energi fosil memiliki ketersediaan terbatas, disisi lain kebutuhan energi semakin meningkat. Hal ini menjadi alasan untuk mengembangkan energi alternatif yang bisa menggantikan energi fosil. Kandidat kuat dalam penyediaan energi alternatif adalah energi surya. Energi surya diubah menjadi energi listrik melalui proses efek fotovoltaik. Penelitian ini menyintesis dan karakterisasi komponen sel surya hibrid berbasis poly(3-octyltiophene) (organik) dan lead sulfide quantum dots (anorganik). Metode spin coating dipilih dalam pembuatan lapisan komponen sel surya karena beberapa kelebihannya. Penggunaan metode spin coating memiliki kelebihan diantaranya kontrol komponen kimia yang mudah, biaya operasi yang rendah, dan proses yang cepat. Hasil penelitian berupa data XRD dan properti optik. Berdasarkan data properti optik penambahan material organik dapat menggeser puncak serapan ke arah panjang gelombang lebih besar. Penambahan material organik juga memperlebar rentang serapan sel surya. Penelitian ini menandai langkah penting dalam upaya meningkatkan efisiensi dan ketersediaan teknologi sel surya dalam mendukung transisi menuju energi terbarukan yang lebih berkelanjutan., Fossil energy has limited availability, on the other hand, energy demand is increasing. This is a reason to develop alternative energy that can replace fossil energy. A strong candidate for providing alternative energy is solar energy. Solar energy is converted into electrical energy through the photovoltaic effect process. This research synthesizes and characterizes hybrid solar cell components based on poly(3-octylthiophene) (organic) and lead sulfide quantum dots (inorganic). The spin coating method was chosen to manufacture layers of solar cell components because of its several advantages. Using the spin coating method has advantages including easy control of chemical components, low operating costs, and a fast process. The research results are in the form of XRD data and optical properties. Based on optical property data, the addition of organic material can shift the absorption peak towards a larger wavelength. The addition of organic materials also widens the absorption range of solar cells. This research marks an important step in efforts to increase the efficiency and availability of solar cell technology to support the transition to more sustainable renewable energy.
Keyword: Bulk-Heterojunction, P3OT, PbS QDs, Hybrid Solar Cells, ZnO

Judul: Bakteri Flora Paling Umum Ditemukan Di Rongga Mulut Python Retikulatus Liar
Abstrak: Reticulated python is a non-venomous snake native to South and Southeast Asia. It is the world's longest snake. The purpose of this literature review study is to investigate the common bacterial flora found in oral cavity of the reticulated python. The data for this case study was obtained from several articles, journals, books and credible websites. Based on existing data, there are a wide variety of bacteria in the oral cavity of free-living reticulated pythons. The majority of the organisms were Gram-negative. Pseudomonas spp. were the most commonly isolated bacterial species, being found in 50% of the snakes sampled, and was followed by Staphylococcus sciuri.
Keyword: Reticulated python, snake bites, bacterial flora, oral cavity, microbiology