Judul: Sel Surya Hibrid Organik/Anorganik berbasis Bulk Heterojunction Nanopartikel TiO2 dan Klorofil dari Spirulina plantesis
Abstrak: Pengembangan besar-besaran untuk mencari sistem pembangkit listrik secara ekonomis untuk memanfaatkan sinar matahari dalam bentuk sel surya masih dilakukan hingga saat ini, namun sel surya konvensional masih terbilang mahal dan dapat memberi dampak buruk untuk lingkungan. Dengan memanfaatkan kemampuan ekstrak klorofil organisme biologis untuk menghasilkan listrik dapat memberikan alternatif tambahan untuk menghasilkan listrik yang lebih ramah lingkungan. Pada penelitian ini, Spirulina plantesis dipilih karena keberadaannya yang cukup mudah ditemukan dan mengandung klorofil yang baik. Selain itu counter-elektroda yang digunakan diperoleh dari jelaga api dan karbon pensil 8B yang sangat mudah didapat. Pemberian variasi counter-elektroda dapat memberikan informasi arus, tegangan, dan daya keluaran listrik yang dihasilkan dari sel surya. Daya keluaran maksimum dan efisiensi yang diperoleh sel surya counterelektrode jelaga berturut-turut sebesar 338,011 × 10-9 Watt dan 0,01%, sementara daya keluaran maksimum dan efisiensi sel surya counter-elektroda karbon pensil 8B berturutturut sebesar 204,254 × 10-9 Watt dan 0,00006%., Massive development to find power generation systems economically to utilize sunlight energy in the form of solar cells is still being done today, but conventional solar cells are still quite expensive and can have a bad impact on the environment. Utilizing the ability of biological organisms' chlorophyll extracts to generate electricity can provide an additional alternative to generating more environmentally friendly electrical energy. In this study, Spirulina plantesis was chosen because of its presence which is quite easy to find and contains good chlorophyll. In addition, the counter-electrodes used are obtained from soot and 8B pencil carbon which are very easy to obtain. The provision of counter-electrode variations can provide information on the current, voltage, and power output of electricity generated from solar cells. The maximum output power and efficiency obtained by the soot counterelectrode solar cell was 338,011 × 10-9 Watts and 0,01%, respectively, while the maximum output power and efficiency of the pencil 8B carbon counter-electrode solar cell was 204,254 × 10-9 Watts and 0,00006% respectively.
Keyword: bulk heterojunction solar cell, Spirulina platensis, iodide/triiodide

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: Zero-inflated negative binomial models in small area estimation.
Abstrak: The problem of over-dispersion in Poisson data is usually solved by introducing prior distributions which lead to negative binomial models. Poisson data sometime is also suffered by excess zero problems, a condition when data contains too many zero or exceeds the distribution's expectation. Zero Inflated Negative Binomial (ZINB) method can be utilized to solve such problems. This paper demonstrates the adaption of ZINB methods in Small Area Estimation with excess zero data. It is shown that the excess zero problem has substantially influenced the Empirical Bayes (EB) estimates, and the adaption of ZINB methods has improved the precision and reliability of the estimates. Key Words: Small Area Estimation, Zero-Inflation, Poisson-Gamma, Negative Binomial Regression, Empirical Bayes
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