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All Journal JFA (Jurnal Fisika dan Aplikasinya)
Retno Asih Retno Asih
Department of Physics, Institut Teknologi Sepuluh Nopember, Kampus ITS-Sukolilo Surabaya
Physics

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Determining the Deposition Rate of Semiconducting Intrinsic Layer Prepared by Nanospray Method: Aulia Anisa Firdaus, Endhah Purwandari, Retno Asih, Ahmad Sholih, Darminto Darminto Aulia Anisa Firdaus Aulia Anisa Firdaus; Endhah Purwandari Endhah Purwandari; Retno Asih Retno Asih; Ahmad Sholih Ahmad Sholih; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 19 No 2 (2023): June 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i2.16559

Abstract

Amorphous carbon (a-C) film provides potential ability as an i-type layer in semiconductor material for photovoltaic purposes due to its tunable properties. Here, we investigate how to get the deposition rate estimation of the thickness and homogenous surface of a-C film as an i-type in solar cell applications. The a-C was prepared from palmyra liquid sugar using nebulizer as a nanospray method. The thick palmyra liquid sugar was carbonized at 250 C for 2.5 hours then continued at 300 C for 2 hours to obtain high-carbon charcoal. The thickness was examined using a SEM cross section, and the amorphous phase was measured using XRD. The amorphous characteristic of a-C is confirmed by broad peaks in XRD patterns. The thickness of a-C films was found to be thinner than in a previous study that used a similar materials and methods but different equipment in the deposition process. The average thickness of a-C films is in the range of 200 to 450 nm, followed by an increase in the deposition time of 5 to 25 s. By these value, the deposition rate estimation was obtained using extrapolation linier method from the SEM result around 11.62 nm/s. This result can be used as a reference to make various thicknesses for the i-layer in order to find the maximum thickness that gives high efficiency to amorphous carbon film.
Physical Properties Comparison of rGO-like phase prepared from Coconut Shell and the Commercial Product: Retno Asih, Maya Mahirotul Septya, Erik Bhekti Yutomo, Fahmi Astuti, Malik Anjelh Baqiya, Darminto Darminto Retno Asih Retno Asih; Maya Mahirotul Septya Maya Mahirotul Septya; Erik Bhekti Yutomo Erik Bhekti Yutomo; Fahmi Astuti Fahmi Astuti; Malik Anjelh Baqiya Malik Anjelh Baqiya; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.6712

Abstract

Physical properties of reduced graphene oxide (rGO) prepared from two different raw materials, namely coconut shell (rGO-s) and graphite mineral (rGO-c, produced by Graphenea Inc.), have been investigated. While both samples have the same density of about 1.9 g/cm3, rGO-c has more porous of about 1.3 cc/g with diameter of 10.8 nm compared to rGO-s which has 0.2 cc/g porous with diameter of 2.4 nm. Specific surface area in rGO-c was also obtained much larger than that of rGO-s. rGO-c and rGO-s have specific surface area of ~298 m2/g and ~475 m2/g, respectively. Examinations on particle size and surface morphology show that rGO-c has homogenous particles which consist of transparent thin sheets, while rGO-s has rather heterogenous particles that look like dens stacked sheets. The presence of C and O was confirmed at the observed morphology. The difference in physical features were then found to influence the obtained electrical conductivity of the samples. rGO-c has higher conductivity than rGO-s. Estimation on gap energy (Eg) indicates that rGO-c and rGO-s have Eg in the range of semiconducting materials. The study provides a better understanding on physical properties of coconut shell-derived rGO to further revise synthesis method to improve quality of the obtained rGO.
Study of the Formation of Amorphous Carbon and rGO-like Phases from Palmyra Sugar by Variation of Calcination Temperature: Fahmi Astuti, Novita Sari, Vera Laviara Maghfirohtuzzoimah, Retno Asih, Malik Anjelh Baqiya, Darminto Darminto Fahmi Astuti Fahmi Astuti; Novita Sari Novita Sari; Vera Laviara Maghfirohtuzzoimah Vera Laviara Maghfirohtuzzoimah; Retno Asih Retno Asih; Malik Anjelh Baqiya Malik Anjelh Baqiya; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.6706

Abstract

We have processed biomass from palmyra sugar to produce allotrope carbon by heating process with the variation of calcination temperature. The formation of amorphous carbon (a-C) was confirmed from the XRD result heated at 400°C with the observation of the peak at the position of ~24o. By increasing the temperature at 700°C, the presence of two peaks at 24o and 43o were observed, indicating the formation of rGO-like phase. The functional groups detected by FTIR spectra consist of C=C, C-O, C=O, C-H and O-H. The result of conductivity measurement exhibits that the material can be classified as semiconducting materials.
Co-Authors Ahmad Sholih Ahmad Sholih Aulia Anisa Firdaus Aulia Anisa Firdaus Darminto Darminto Darminto Darminto Endhah Purwandari Endhah Purwandari Erik Bhekti Yutomo Erik Bhekti Yutomo Fahmi Astuti Fahmi Astuti Fahmi Astuti Fahmi Astuti Malik Anjelh Baqiya Malik Anjelh Baqiya Maya Mahirotul Septya Maya Mahirotul Septya Novita Sari Novita Sari Vera Laviara Maghfirohtuzzoimah Vera Laviara Maghfirohtuzzoimah