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Endhah Purwandari
Jurusan Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Jember
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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Optimasi Tekanan Deposisi dalam Simulasi Efisiensi Sel Surya Berbasis Material a-Si:H Purwandari, Endhah; Winata, Toto
GRADIEN : Jurnal Ilmiah MIPA Vol 8, No 1 (2012): (Januari 2012)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3491.193 KB)

Abstract

Perhitungan efisiensi konversi sel surya tipe persambungan p-i-n dengan berbasis material a-Si:H dilakukan berdasarkan simulasi perhitungan karakteristik I-V dari material. Dalam bentuk 1 dimensi, Persamaan Poisson dan Persamaan Kontinyuitas diselesaikan dengan menggunakan  Femlab Simulation. Data empirik optical band gap Eg pada variasi tekanan deposisi 0-500 mTorr,  yang diperoleh dalam penumbuhan a-Si;H menggunakan teknik HWC-VHF-PECVD, menjadi input kegiatan optimasi. Hasil simulasi menunjukkan terjadinya penurunan efisiensi dengan adanya kenaikan Eg. Efisiensi sel surya tertinggi sebesar 9,88% diperoleh pada tekanan deposisi a-Si:H sebesar 500 mTorr. Perhitungan efisiensi konversi sel surya tipe persambungan p-i-n dengan berbasis material a-Si:H dilakukan berdasarkan simulasi perhitungan karakteristik I-V dari material. Dalam bentuk 1 dimensi, Persamaan Poisson dan Persamaan Kontinyuitas diselesaikan dengan menggunakan  Femlab Simulation. Data empirik optical band gap Eg pada variasi tekanan deposisi 0-500 mTorr,  yang diperoleh dalam penumbuhan a-Si;H menggunakan teknik HWC-VHF-PECVD, menjadi input kegiatan optimasi. Hasil simulasi menunjukkan terjadinya penurunan efisiensi dengan adanya kenaikan Eg. Efisiensi sel surya tertinggi sebesar 9,88% diperoleh pada tekanan deposisi a-Si:H sebesar 500 mTorr.   
Perbandingan Citra Hasil Rekonstruksi Metode Newton-Raphson dan Landweber pada Electrical Capacitance Tomography: Analisis Resolusi dan Akurasi Rifang Pri Asmara; Agung Tjahjo Nugroho; Endhah Purwandari
Jurnal Fisika dan Aplikasinya Vol 16, No 1 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i1.5238

Abstract

Penelitian untuk membuat desain Electrical Capacitance Tomography dilakukan menggunakan metode numerik Finite Difference Method (FDM) untuk forward problem dan ditentukan tingkat akurasinya terhadap metode analitik. Solusi berbasis FDM yang diperoleh, digunakan dalam proses rekonstruksi menggunakan metode Landweber dan Newton-Raphson. Perbandingan citra hasil rekonstruksi dari kedua metode dianalisis berdasarkan resolusi dan akurasi citra yang dihasilkan. Hasil penelitian ini menunjukkan bahwa akurasi Finite Difference Method dengan melakukan pemotongan garis pada objek domain, didapatkan 90,57% pada garis horizontal dan 87,43% pada garis vertikal. Adapun hasil untuk rekonstruksi didapatkan akurasi proses rekonstruksi 98% untuk Newton-Raphson dan 88% untuk Landweber. Resolusi citra yang direkonstruksi dengan menggunakan Newton-Raphson mampu membedakan 2 benda dengan jarak pisah minimal 3 cm, sedangkan Landweber mampu membedakan 2 benda dengan jarak pisah minimal 8 cm.
Pengaruh Fraksi Massa terhadap Sifat Mekanik Material Komposit Binderless dari Ampas Tebu dan Serbuk Kayu Sengon Aan Ubaidillah; Sujito Sujito; Endhah Purwandari
Jurnal Sains Dasar Vol 8, No 2 (2019): October 2019
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v8i2.23676

Abstract

Analisis pengaruh fraksi massa serat ampas tebu dan serbuk kayu sengon terhadap sifat mekanik material komposit binderless dapat dilakukan dengan melakukan pengujian tarik dan pengujian bending terhadap material komposit binderless hasil sintesis. Pengujian dilakukan terhadap material komposit binderless dengan fraksi massa serbuk kayu sengon 0%-100%. Hasil dari pengujian menunjukkan kekuatan tarik paling tinggi berada pada fraksi massa serbuk kayu sengon 100% (tanpa serat ampas tebu) dengan nilai sebesar (8,11 ± 0,69) MPa. Sementara untuk modulus elastisitas paling besar berada pada fraksi massa serbuk kayu sengon 40% dengan nilai sebesar (53,14 ± 1,73) MPa. Hasil pengujian bending menunjukkan kekuatan bending paling besar berada pada fraksi massa serbuk kayu sengon 90% dengan nilai sebesar (15,82 ± 1,90) MPa. Sementara itu untuk nilai modulus bending paling tinggi berada pada fraksi masssa serbuk kayu sengon 100% dengan nilai sebesar (439,88 ± 30,36) MPa.
Simulation of Solar Cell Diode I-V Characteristics Using Finite Element Methode: Influence of p- Layer Thickness Greta Andika Fatma; Endhah Purwandari; Edy Supriyanto
UNEJ e-Proceeding 2016: Proceeding The 1st International Basic Science Conference
Publisher : UPT Penerbitan Universitas Jember

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Abstract

Characteristic of I-V is a key parameter of describing the performance of solar cell diode, specially for Silicon material. One of the effort to get its higher performance can be conducted by investigating the effect of the thickness of p-layer. The thickness becomes important factor because of its function as windows layer, which will determine the number of generation factor, appropiate to the charge carrier producing. Here, we explore them by using computer program, applying finite element methode as the numerical simulation. The geometry of the diode was simulated in one dimensional structure, where the thickness of p-layer varied from 0,7 μm to 1,5 μm, while the n-layer was fixed at a thickness of 3,5 μm. The result showed that the optimum parameters has come out to achieve the best performance of this type of solar cell.
Simulation of I-V Characteristics of Si Diode at Difference Operating Temperature:Effect of Ionized Impurity Scattering Siti Lailatul Arofah; Endhah Purwandari; Edy Supriyanto
UNEJ e-Proceeding 2016: Proceeding The 1st International Basic Science Conference
Publisher : UPT Penerbitan Universitas Jember

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Abstract

The usage quality of Si Diode was influenced by the operating temperature. The increment of temperature caused the increased number of ionized impurities. Coulomb interaction between the impurities and the local charge carrier caused the scattering on the impurity. Furthermore, this scattering causes changes in the velocity and mobility of charge carriers. This gives an effect on the distribution of charge carriers, causing changes in the diffusion current density. In this paper, we perform the I-V characteristic of Si diode, simulated in two dimensional structure. Several temperatures (200K-473K) and also the charge carrier mobility were observed as the input parameter of the equation modelled. The simulation results show that the value of current density diffusion of Si Diodes was maximum at temperature of 200K and decreasing at a higher temperature of 473K.
Mechanical Properties and Biodegradability of Bamboo and Sengon Wood Thin Sheets Reinforced Poly Latic Acid (PLA) Biocomposites) S. Sujito; Hanim Munawaroh; Endhah Purwandari
Jurnal ILMU DASAR Vol 14 No 2 (2013)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (591.423 KB) | DOI: 10.19184/jid.v14i2.513

Abstract

Development of biocomposite materials based on natural fibers and environmentally friendly resins to replace composite materials made from plastic and synthetic fibers give the consideration that the biocomposite materials are environmentally friendly materials. In this paper, we discuss the synthesis and characterization of biocomposite materials using a combination of thin sheets of bamboo reinforcement and resin sengon and poly lactic acid (PLA). As controls were also carried out the synthesis and characterization of biocomposite material with a thin layer of reinforcement only sengon bamboo and wood. Characterization of tensile strength and modulus of elasticity of the material is done by using the Tensile Test Machine ASTM D 638. In the mean time, biodegradability of materials are observed made by the method of burial for 1-4 weeks. Tensile test results show that the biocomposite material reinforced with a thin sheet bamboo has a tensile strength and modulus of elasticity greater than that of the other biocomposite materials produced in this study. Meanwhile, biocomposite materials with thin layers of wood sengon reinforced easily biodegradable (dG = 13.21 ± 0.59)%, compared to a biocomposite material with a thin layer of bamboo reinforcement (dG = 10.69 ± 0.79)%. From these results it can be concluded that the composite material with a thin layer of bamboo boosters are more likely to be applied to replace metallic materials.Keywords: Biocomposites, tensile strength, elastic modulus, biodegradability, bamboo and sengon wood thin layer.
Efficiency Calculation Analysis of A-Si:H Solar Cells for Determination of Optimum Filament Temperature in Material Deposition Endhah Purwandari; Toto Winata
Jurnal ILMU DASAR Vol 14 No 1 (2013)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (726.416 KB) | DOI: 10.19184/jid.v14i1.478

Abstract

Solar cell efficiency as a function of the energy gap has been simulated by calculating the output current characteristics of the devices based on the distribution of charge carriers, obtained from the solution of the Poisson equation and the Continuity equation. The hydrogenated amorphous silicon (a-Si:H) based solar cell, has simulated in the form of one-dimensional single junction p/i/n. The junction structure of a-SiC:H/a-Si:H/a-Si:H designed have the thickness of 0,015 μm/0,550 μm/0,030 μm, respectively. For simulation, the energy gap has considered constant in the p and n layers, whereas the i layer varies according to the empirical data of energy gap obtained from the deposition parameters of filament temperature. Simulations performed using the finite element method supported by FEMLAB software. Based on simulation results, obtained the highest efficiency of 9.35% corresponds to the lowest energy gap data of 1.706 eV for layer i. This appropriates to the filament temperature of 800oC and subsequently used as the optimum deposition parameters of the material. Keyword: Energy gap, efficiency, FEM, solar cell, hydrogenated amorphous silicon
Biobriket Arang Sekam Padi sebagai Sumber Energi Terbarukan untuk Aplikasi Pandai Besi Wenny Maulina; Yudi Aris Sulistiyo; Endhah Purwandari
Warta Pengabdian Vol 14 No 4 (2020): Warta Pengabdian
Publisher : LP2M Universitas Jember

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Abstract

Sumber energi terbarukan berbasis biomassa merupakan sumber daya potensial menggantikan kayu bakar atau batu bara yang persediannya semakin menipis sebagai bahan bakar industri pandai besi. Salah satu potensi biomassa adalah sekam padi yang dapat dijadikan bahan baku pembuatan biobriket. Oleh karena itu, tujuan pelaksanaan kegiatan ini adalah untuk menghasilkan biobriket arang sekam padi sebagai bahan bakar alternatif pada industri pandai besi. Kegiatan ini dilakukan dalam beberapa tahapan yaitu 1) pembuatan alat pencetak yang mampu menghasilkan 4 buah biobriket sekali produksi, 2) pembuatan biobriket arang sekam dan diuji sifat dan karakteristiknya, dan 3) pelatihan pembuatan dan penerapan langsung biobriket untuk proses pemanasan besi pada industri pandai besi. Karakteristik biobriket arang sekam diuji berdasarkan nilai kapasitas kalor, kadar air, kadar abu, dan volatile matter berturut–turut adalah 3709,47 kalori per gram; 4,27%; 3,93%; dan 59,20%. Hasil pengujian pembakaran secara langsung menghasilkan nyala api berwarna biru dengan suhu berkisar 533,8 – 704,3 oC. Hasil biobriket telah diimplementasikan dan mampu diterima untuk menggantikan kayu bakar yang selama ini digunakan pada sentra pengrajin pandai besi di Desa Suger Kidul, Kec. Jelbuk, Kab. Jember.
Study of J-V Characteristics of Microcrystalline Silicon Solar Cell on The Structure of P-I-N Homojunction Dewi, Yuningtyas Nely Kusuma; Purwandari, Endhah; Anwar, Khoirul; Misto, Misto
Computational And Experimental Research In Materials And Renewable Energy Vol 3 No 1 (2020): May
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v3i1.26416

Abstract

Microcrystalline silicon (μc-Si) is a silicon semiconductor material with a crystalline structure in the amorphous phase. Here, the transport phenomenon in this phase has been modeled to produce charge carrier distribution profile and current density-voltage characteristics. The calculations were obtained by solving Poisson and Continuity equations on crystal and amorphous materials which are modeled in one-dimensional p-i-n homojunction, using finite element method. The simulation results of the charge carrier distribution profile show that the highest electron concentration in the n-layer of 1018 cm-1, and the highest hole concentration in the p-layer of 1018 cm-1. The result current density-voltage (J-V) characteristics curve show that the open circuitt voltage of 0,6 volts and short-circuit current density of 26.4 mA/cm. The energy conversion efficiency of 9.02% with a fill factor of 0.569.
Built in Potential of a-Si:H Based p-i-n Solar Cell at Different Energy Gap of Intrinsic Layer Yuniarsih, Rahayu Setyo; Purwandari, Endhah; Misto, Misto; Supriyanto, Edi; Supriyadi, Supriyadi
Computational And Experimental Research In Materials And Renewable Energy Vol 1 No 1 (2018): November
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v1i1.19547

Abstract

The photovoltaic process inside a solar cell can be described using the distribution of electrostatic potential in the material. In this paper, the magnitude of the electrostatic potential of the solar cell for the p-i-n junction type is analyzed as the built in potential due to the diffusion activity of electrons and holes. The magnitude of the electrostatic potential is obtained by solving the Poisson and Continuity equations, which are applied to a-Si: H based materials. The difference in built in potential at the p-i and i-n junctions is obtained as a function of the energy gap of the intrinsic layer.
Co-Authors Aan Ubaidillah Agung Tjahjo Nugroho Ardi, Pramudya Arry Y. Nurhayati Artoto Arkundato Bintoro Siswo Nugroho Darminto . Dewi, Yuningtyas Nely Kusuma Edi Supriyanto, Edi Edy Supriyanto Endang Haryati, Endang Fachry Abda El Rahman Firdaus, Aulia Anisa Greta Andika Fatma Hanim Munawaroh Hidayat, Umar Sahiful Ihtiari Prastyaningrum, Ihtiari Imam Wahyudi Indrawan, Imam Wahyudi Imanullah, Muhammad Abdul Bashar Karomah, Iklimatul Khoirul Anwar Lutfi Rohman Misto Misto Misto Musyarofah, L. Ni’mah, Khiptiatun Putra, Fikri Abdi Retno Asih, Retno Rifang Pri Asmara Sari, Silfiana Puspita Sholih, Ahmad Siti Lailatul Arofah Soleha, Imroatus Sujito Sujito Supriyadi Supriyadi Syarifah, Ratna Dewi Toto Winata Trianti, Nuri Wahyu Hidayat Wenny Maulina Wenny Maulina, Wenny Yudi Aris Sulistiyo, Yudi Aris Yuniarsih, Rahayu Setyo