scholarly journals SYNTHESIS OF CARBON DOTS (CDS) AND DETERMINATION OF OPTICAL GAP ENERGY WITH TAUC PLOT METHOD

2021 ◽  
Vol 3 (2) ◽  
pp. 73-86
Author(s):  
Jumardin Jumardin ◽  
Akhiruddin Maddu ◽  
Koekoeh Santoso ◽  
Isnaeni Isnaeni
Keyword(s):  
Carbon Dots ◽  
Energy Gap ◽  
Indirect Transition ◽  
Optical Energy Gap ◽  
Time Duration ◽  
Optical Energy ◽  
Laser Ablation Method ◽  
Tauc Plot ◽  
Optical Gap Energy

Carbon Dots (CDs) which have been synthesized using the laser ablation method show the presence of UV-Vis absorption in the wavelength range of 303 nm to 333 nm for absorbance and 495 nm to 503 nm for fluorescence. Changes in the time duration 1, 2, 3 hours of CDs resulted in changes in the optical energy gap. The optical energy gap valuesare distinguished by the type of indirect transition (n=2) is 3.40 eV (1 hour), 3.15 eV (2 hour), 2.85 eV (3 hour) and direct transition (n=1/2) is 2.58 eV (1 hour), 2.31 eV (2 hour), 1.70 eV (1 hour).

scholarly journals PENENTUAN CELAH ENERGI OPTIK EKSTRAK DAUN ALPUKAT (PERSEA AMERICANA MILL) ASAL DESA OINLASI MENGGUNAKAN METODE TAUC PLOT

2018 ◽  
Vol 3 (1) ◽  
pp. 86-90
Author(s):  
Magdalena M. Y. Missa ◽  
Redi K. Pingak ◽  
Hadi Imam Sutaji
Keyword(s):  
Energy Gap ◽  
Electronic Devices ◽  
Persea Americana ◽  
Indirect Transition ◽  
Direct Transition ◽  
Optical Energy Gap ◽  
Tauc Plot ◽  
Forbidden Transition ◽  
Alternative Materials

Abstrak Telah ditentukan celah energi optik ekstrak daun alpukat (Persea Americana Mill) asal Desa Oinlasi menggunakan metode Tauc plot. Penentuan nilai celah energi ditentukan untuk 3 kemungkinan jenis transisi yaitu direct transition, indirect transition, dan direct forbidden transition. Berdasarkan perhitungan menggunakan metode Tauc plot, celah energi rata-rata yang diperoleh untuk masing-masing transisi secara berturut-turut adalah 1,834 eV, 1,829 eV, dan 1,835 eV. Berdasarkan nilai celah energi senyawa hasil ekstrak daun alpukat dapat dikelompokkan sebagai bahan semikonduktor. Oleh karena itu, disimpulkan bahwa ekstrak daun alpukat berpotensi digunakan sebagai bahan alternatif piranti elektronik. Kata kunci : Daun alpukat, celah energi, semikonduktor, Tauc plot Abstract A study on determination optical energy gap of avocado leaves extract (Persea Americana Mill) from Oinlasi Village using Tauc plot method has been done. Determination of energy gap value was done for 3 possible transition types : direct transition, indirect transition, and direct forbidden transition. Based on calculations using Tauc plot method, energy gap average obtained for each transition are 1,834 eV, 1,829 eV, and 1,835 eV, respectively. Based on this energy gap value, the compound of avocado leaves extract can be categorized as a semiconducting material. Therefore, it can be concluded that avocado leaves extract has the potential to be used as alternative materials in electronic devices. Keywords : avocado leaves, energy gap, semiconductor, Tauc plot

Determination of the optical energy gap of Ge1−xSnx alloys with 0

2004 ◽  
Vol 84 (22) ◽  
pp. 4532-4534 ◽  
Author(s):  
H. Pérez Ladrón de Guevara ◽  
A. G. Rodrı́guez ◽  
H. Navarro-Contreras ◽  
M. A. Vidal
Keyword(s):  
Energy Gap ◽  
Optical Energy Gap ◽  
Optical Energy

OPTICAL ENERGY-GAP VARIATION IN InAs–InSb ALLOYS

1964 ◽  
Vol 42 (10) ◽  
pp. 1879-1885 ◽  
Author(s):  
J. C. Woolley ◽  
J. Warner
Keyword(s):  
Room Temperature ◽  
Energy Gap ◽  
Infrared Transmission ◽  
Optical Energy Gap ◽  
Optical Energy ◽  
Transmission Measurements ◽  
Diffuse Reflectivity ◽  
Zone Recrystallization ◽  
Directional Freezing

Homogeneous samples of InAs–InSb alloys have been produced by very slow directional freezing and zone recrystallization methods, and used for the determination of values of the optical energy gap Eg by standard infrared transmission measurements. Room-temperature values of Eg have been obtained in the composition ranges 0–20 and 55–100 mol % InSb and the variation of Eg with temperature from 90 °K to 360 °K for alloys in the composition ranges 0–20 and 80–100 mol % InSb. Approximate room-temperature values of Eg for alloys in the range 20–55 mol % InSb have been obtained by diffuse reflectivity measurements on annealed powders.The value of Eg is found to fall as either compound is added to the other and the room-temperature values show a minimum of 0.10 eV at approximately 60 mol % InSb.

scholarly journals ESTIMASI CELAH ENERGI SENYAWA HASIL EKSTRAK DAUN SIRSAK (ANNONA MURICATA L.) MENGGUNAKAN METODE TAUC PLOT

2019 ◽  
Vol 4 (1) ◽  
pp. 48-51
Author(s):  
Marselinus E. Dandara ◽  
Redi Kristian Pingak ◽  
Albert Zicko Johannes
Keyword(s):  
Absorption Spectrum ◽  
Leaf Extract ◽  
Energy Gap ◽  
Annona Muricata ◽  
Optical Energy Gap ◽  
Optical Energy ◽  
Tauc Plot ◽  
Vis Spectroscopy ◽  
Viscous Solution

Abstrak  Dalam artikel ini, celah energi optik senyawa hasil ekstrak daun Annona Muricata L. diestimasi menggunakan metode Tauc plot. Daun sirsak yang diambil dari Kabupaten Sumba Barat Daya dikeringkan dan dihaluskan kemudian diekstraksi secara maserasi. Selanjutnya, hasil ekstrak ini dievaporasi untuk menghasilkan larutan kental ekstrak daun sirsak. Larutan kental ini kemudian diencerkan kembali untuk memperoleh larutan dengan konsentrasi 100 ppm, 200 ppm dan 300 ppm, yang selanjutnya dikarakterisasi menggunakan spektrofotometer UV-Vis. Spektrum serapan UV-Vis yang diperoleh kemudian dianalisis untuk menentukan celah energi optik senyawa hasil ekstrak daun sirsak. Dengan menggunakan metode Tauc plot, diperoleh nilai celah energi optik rata-rata sebesar 1,830 eV.  Kata kunci: celah energi; daun sirsak; spektroskopi UV-Vis, Tauc plot   Abstract  Estimation of energy gap of compounds extracted from Annona Muricata L. Leaves using Tauc Plot. In this article, optical energy gap of compounds from Annona Muricata L. leaves is estimated using Tauc plot. The leaves taken from Sumba Barat Daya are dried and mashed to become powder, which is then extracted by maceration. The extract is then evaporated to obtain a viscous solution of the leaf extract. The solution is further diluted to obtain solutions with concentration of 100 ppm, 200 ppm and 300 ppm. The solutions are then characterized using UV-Vis spectrophotometer. UV-Vis absorption spectrum obtained is then analyzed to obtain optical energy gap of the material. Using Tauc plot method, the average optical energy gap of the extract is found to be 1,830 eV Keywords: energy gap; Annona Muricata L; UV-Vis Spectroscopy; Tauc Plot

scholarly journals The role of annealing temperature on the optical energy gap and Urbach energy of Se:2%Sb thin films

2008 ◽  
Vol 5 (2) ◽  
pp. 249-252
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thin Films ◽  
Annealing Temperature ◽  
Urbach Energy ◽  
Energy Gap ◽  
Localized States ◽  
Structural Defects ◽  
Indirect Transition ◽  
Optical Energy Gap ◽  
Optical Energy

The optical energy gap(Eopt) and the width of the tails of localized states in the band gap (?E) for Se:2%Sb thin films prepared by thermal co-evaporation method as a function of annealing temperature are studied in the photon energy range ( 1 to 5.4)eV.Se2%Sb film was found to be indirect transition with energy gap of (1.973,2.077, 2.096, 2.17) eV at annealing temperature (295,370,445,520)K respectively. The Eopt and ?E of Se:2%Sb films as a function of annealing temperature showed an increase in Eopt and a decrease in ?E with increasing the annealing temperature. This behavior may be related to structural defects and dangling bonds.

Temperature Dependence of Optical Energy Gap of Gallium Selenide

2001 ◽  
Vol 8 (3-4) ◽  
pp. 251-259 ◽  
Author(s):  
M. Kepinska ◽  
M. Nowak ◽  
Z. Kovalyuk ◽  
R. Murri
Keyword(s):  
Temperature Dependence ◽  
Energy Gap ◽  
Gallium Selenide ◽  
Optical Energy Gap ◽  
Optical Energy

T(Z) diagram and optical energy gap values of (AgIn)2(1–z)(CdIn2)zTe4 alloys

1994 ◽  
Vol 144 (2) ◽  
pp. 311-316 ◽  
Author(s):  
R. Cadenas ◽  
M. Quintero ◽  
J. C. Woolley
Keyword(s):  
Energy Gap ◽  
Optical Energy Gap ◽  
Optical Energy ◽  
Gap Values
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