13 research outputs found
Pengaruh Lapisan Kalsium pada Devais Sel Surya Organik Berbasis Bahan Polimer
No full textOrganic solar cells (OSC) as an emerging photovoltaics devices have potential clean energy source due to their advantages properties, including low-cost production, light weight, and promising for flexible devices. In this study, we investigated the effect of calcium as buffer layer on top photoactive layer of the polymer based solar cell device. Poly-3-hexylthiophene (P3HT) as donor material combining with phenyl-C61-butyric acid methyl ester (PC61BM) were blended to form bulk heterojunction. Calcium was deposited on top of polymer (P3HT) and fullerene derivative (PC61BM) photoactive layer using thermal evaporation inside ultrahigh vacuum chamber. Calcium was selected as buffer layer because of its low-work -function in order to improve performance of polymer solar cells. Our study presented that calcium buffer layer enhanced the performance of solar cells mainly in open circuit voltage, VOC, (0.45 V to 0.61 V) and fill factor, FF, (44% to 65%), increasing power conversion efficiency (PCE) from 1.79% to 3.79%. This result suggested that the improvement of polymer solar cells performance because of the recombination suppression and more efficient charge transfer in cathode. The energy level alignment and work function properties of calcium form an ideal ohmic contact between the active layer and the cathode, thus ensuring effective electron injection from the active layer to the cathode. We also demonstrated the fabrication of polymer solar cells device under ambient atmosphere. However, the devices fabricated under ambient atmosphere have lower performances than fabricated inside nitrogen filled glovebox, because polymer photoactive material and calcium are easily degraded by moisture
Pengaruh Lapisan Kalsium pada Devais Sel Surya Organik Berbasis Bahan Polimer
No full textOrganic solar cells (OSC) as an emerging photovoltaics devices have potential clean energy source due to their advantages properties, including low-cost production, light weight, and promising for flexible devices. In this study, we investigated the effect of calcium as buffer layer on top photoactive layer of the polymer based solar cell device. Poly-3-hexylthiophene (P3HT) as donor material combining with phenyl-C61-butyric acid methyl ester (PC61BM) were blended to form bulk heterojunction. Calcium was deposited on top of polymer (P3HT) and fullerene derivative (PC61BM) photoactive layer using thermal evaporation inside ultrahigh vacuum chamber. Calcium was selected as buffer layer because of its low-work -function in order to improve performance of polymer solar cells. Our study presented that calcium buffer layer enhanced the performance of solar cells mainly in open circuit voltage, VOC, (0.45 V to 0.61 V) and fill factor, FF, (44% to 65%), increasing power conversion efficiency (PCE) from 1.79% to 3.79%. This result suggested that the improvement of polymer solar cells performance because of the recombination suppression and more efficient charge transfer in cathode. The energy level alignment and work function properties of calcium form an ideal ohmic contact between the active layer and the cathode, thus ensuring effective electron injection from the active layer to the cathode. We also demonstrated the fabrication of polymer solar cells device under ambient atmosphere. However, the devices fabricated under ambient atmosphere have lower performances than fabricated inside nitrogen filled glovebox, because polymer photoactive material and calcium are easily degraded by moisture
LUMINESCENCE NANOPARTIKELEMISI CAHAYATAMPAK SEBAGAI TINTAPENGAMAN
No full textLUMINESCENCE NANOPARTIKELEMISI CAHAYATAMPAK SEBAGAI TINTAPENGAMAN. Nanopartikel ZnO disintesis dengan metode sol-gel dengan menggunakan LiOH sebagai agen hidrolisisnya. Hasil sintesis dikarakterisasi dengan difraksi sinar X (XRD) untuk mengkaji kristalinitas dan UV Vis untuk menentukan lebar celah pita energi. Koloid nanopartikel yang dihasilkan memiliki ukuran sekitar 3 nm yang menghasilkan celah pita energi sekitar 3,53 eV. Kristalinitas nanopartikel dipengaruhi oleh konsentrasi LiOH yang digunakan. ZnO berukuran 3 nm dapat menghasilkan luminescence cahaya biru jika disinari ultraviolet. Pembesaran ukuran partikel menyebabkan pergeseran luminescence ke arah merah. Luminescence cahaya tampak pada koloid dimanfaatkan sebagai tinta pengaman. Pada penelitian ini juga dilaporkan uji tinta menggunakan nanopartikel dengan memvariasikan sejumlah parameter seperti jenis kertas, warna kertas dan komposisi tinta
TWO NEW RECORDS OF ANTHIINE FISHES GENUS PLECTRANTHIAS (PERCIFORMES: SERRANIDAE) FROM INDONESIA
No full textThree specimens of Plectranthias retrofasciatus Fourmanoir and Randall, 1979 and one specimen of P. randalli Fourmanoir and Rivaton, 1980 were collected by first author from fish market, Bitung, North Sulawesi on June and September 2010. The specimens were deposited at LBRC-F, the reference collection of LIPI Bitung, Technical Implementation Unit for Marine Biota Conservation, Research Centre for Oceanography, Indonesian Institute of Sciences, Bitung, Indonesia. Plectranthias retrofasciatus is closely related to P. megalophthalmus and P. knappi, in sharing some morphological characters as snout length and interorbital width, while P. randalli differs to other species by having a moderate deep body proportion. Initially these species known only from New Caledonia for P. retrofasciatus and Chesterfield Islands and southern Taiwan for P. randalli respectively. The two species of anthiine fishes collected from Bitung, Indonesia bringing the total number of species of this genus known in Indonesia to six
Synergistic Improvements in Stability and Performance of Lead Iodide Perovskite Solar Cells Incorporating Salt Additives
No full text[[sponsorship]]應用科學研究中心[[note]]已出版;[SCI];有審查制度;具代表性[[note]]http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Drexel&SrcApp=hagerty_opac&KeyRecord=2050-7488&DestApp=JCR&RQ=IF_CAT_BOXPLO
Fabrication of flexible indium tin oxide-free polymer solar cells with silver nanowire transparent electrode
No full textWell-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells
No full textThe stability improvements of dye-sensitized solar cell with natural template for photoanode using lignin extracted from rice husk
No full textIn response to escalating global concerns over environmental pollution, the development of green dye-sensitized solar cells (DSSCs) has emerged as a promising technology for solar energy conversion. This study harnesses the potential of rice husk, an abundant agricultural waste in Indonesia, by extracting lignin through a simple recycling method. Lignin acts as a natural, non-toxic dopant and template for TiO₂ composites, enhancing the stability of the photoanode in DSSCs. A TiO₂ photoanode modified with 5 % lignin achieved a power conversion efficiency (PCE) of 4.81 %. After a 90-day stability test, the TiO2/lignin 5 % composite retained 78 % of its initial PCE, significantly outperforming pristine TiO₂ in terms of short-circuit current density (JSC) and open-circuit voltage (VOC). This improved stability is attributed to increased porosity, better lignin dispersion within the TiO₂ matrix, prevention of agglomeration, enhanced surface area for dye adsorption, and reduced electrolyte leakage. Furthermore, lignin's high thermal stability on the TiO₂ surface provides additional protection against dye degradation and electrolyte evaporation during repeated light exposure
Enhanced Organic Solar Cell Performance by Lateral Side Chain Engineering on Benzodithiophene-Based Small Molecules
No full textThe
three novel acceptor–donor–acceptor (A–D–A)
conjugated small molecules were synthesized, each featuring a benzodithiophene
(BDT) core presenting lateral flexible side chains: TB-BDT6T substituted with 2-ethynyl-5-octylthiophene, TS-BDT6T substituted with 2-(octylthio)thiophene, and TT-BDT6T substituted with 2-(2-ethylhexyl)thieno[3,2-b]thiophene
groups. The lateral incorporation of functionalized π-conjugated
flexible side chains, without altering the end-capped acceptor (cyanoacetate)
moieties, amended the optoelectronic properties of these BDT-based
small molecules. X-ray diffraction spectroscopy revealed that these
small molecules possess high crystallinity; moreover, the optimized
blend film morphologies, recorded using atomic force microscopy, revealed
miscibility with PC61BM, and turn out nanoscale phase separations.
The energy levels of the highest occupied and lowest unoccupied molecular
orbitals of these small molecules were allowed, leading to high open-circuit
voltages (Voc) for their solar cell devices.
The bulk heterojunction small-molecule solar cell based on TT-BDT6T:PC61BM blend presented the highest power conversion efficiency
(5.80%) with a high value of Voc of 0.98
V, a short circuit density of 9.49 mA cm–2, and
a fill factor of 62.44% under AM 1.5G irradiation (100 mW cm–2)
