13 research outputs found
Tris (8-Hydroxyquinolinate) metals for solution-processed organic solar cells / Fahmi Fariq Muhammad
No full textThe simple fabrication process involving minimal material usage makes solutionprocessed
organic solar cell (Courses) devices very attractive for harvesting solar
energy. However, production of these devices on a commercial scale has been slow due
to their relatively low power conversion efficiency and stability problems. It is expected
that these obstacles will be surmounted in the future with rigorous studies actively being
done in this field of research. Besides, a complete understanding of some basic
electrical responses of these OSC devices has not been achieved yet. Consequently,
seeking for interesting materials suitable for OSCs application and understanding the
materials contribution are of great importance especially when strategies are targeted for
the enhancement of OSCs. Tris (8-hydroxyquinolinate) metals (Mq3) are well known in
the fabrication of stable organic light emitting diodes (OLEDs) and also for their unique
optoelectronic properties. Very recently, tris (8-hydroxyquinolinate) aluminium (Alq3)
prepared by thermal evaporation has been used as a buffer layer and dopant material to
improve the performance of OSCs. However, its employment in solution-processed
organic solar cells is still rare. Little attention has been paid on the behaviour of this
material when applied in organic solar cells. Therefore, benefiting from the properties of
Mq3 and easy fabrication process of solution-processed organic solar cell, the current
thesis is focused on characterizing the OSCs related physical properties of tris (8-
hydroxyquinolinate) gallium (Gaq3) and aluminium (Alq3) (as representatives of the
Mq3 materials) and then applying them in solution-processed organic solar cells. The
solution-processed OSC devices are based on ternary bulk heterojunction structure
(three components blended all together) of dihexylisexithiophen/Mq3/methanofullerene
(DH6T/Mq3/PCBM). The optoelectronics, spectroscopic, electrochemical, structural,
morphological, and thermal properties of Mq3 materials are first investigated before incorporating them into the photovoltaic active layers of the devices. From the analysis
of physical properties of Mq3 materials as well as the assessment on the electrical
characteristics of the devices, this work suggests that Mq3 can be a good candidate to be
applied in solution-processed OSCs. The photovoltaic and electrical characteristics of
the devices demonstrated that the photocurrent, open circuit voltage, and the
performance of the devices have improved by approximately six times compared to the
devices without Mq3 incorporation. The basic contribution of Mq3 materials for this
improvement is believed to originate from the increase in the number of exciton
generation and their dissociation into free charge carriers. This can be due to the
enlarged area of the donor-acceptors boundaries between each of the DH6T/Mq3 and
DH6T/PCBM moieties, thereby broadening the absorption of photons. Next, Mq3
incorporation can result in the stabilization of the mobility of the charge carriers within
the DH6T donor and Mq3/PCBM acceptors producing a balanced transportation for the
holes and electrons. The results indicated promising approaches for Mq3 materials to be
applied in solution-processed OSCs as incorporation of Mq3 into the devices active
layers considerably enhanced the overall performance and reproducibility of these
devices
Tuning the optical band gap of DH6T by Alq3 dopant
No full textDihexyl-sexithiophene (DH6T) was doped with tris (8-hydroxyquinolinate) aluminum (Alq3) to prepare blends of DH6T/ Alq3 by dissolving the mixture in the chloroform/hexane co-solvent. Solid films with different thickness deposited on quartz substrates were obtained from the blends via casting process. Optical absorption spectroscopy has been performed to measure the optical band gap of pure and doped DH6T as well as variations in the band gap with dopant concentration (weight %). This variation in optical band gap with dopant concentration was determined quantitatively with fitted and extrapolated techniques and observed qualitatively from the red shift appeared along the optical absorption spectra. The results showed that within a specific dopant content, the optical energy gap, Eg of DH6T decreases from 2.69 eV to 1.8 eV with increasing dopant concentration to 23.1%
Rasionalitas tafsir The Message Of The Quran karya Muhammad Asad: Analisis ayat-ayat mukjizat
No full textINDONESIA :
Khawariqul ‘Adah atau diistilahkan dengan peristiwa luar biasa yang Allah anugerahkan kepada para nabisebagai bukti kenabiannya di hadapan umatnya pada waktu nabi di utus. Sesuatu yang diluar nalar atau irasonal (tidak masuk akal), atau khawariqul ‘adah. Seperti halnya Nabi Ibrahim A.s yang tidak terluka sama sekali oleh api ketika dibakar oleh kaumnya dan Nabi Isa As. Yang bisa menghidupkan orang mati, atau ketika Nabi Musa A.s membelah lautan dengan tongkatnya saat di kejar oleh Fir’aun dan pasukannya, dan masih banyak lagi nabi-nabi lain yang mendapatkan mukjizat dari Allah Swt. di satu sisi mukjizat itu adalah kejadian di luar nalar akan tetapi ada mufassir yang mencoba merasionalkan ayat-ayat mukjizat para nabi agar bisa dipahami akal, seperti apa yang dikemukaan oleh Muhammad Asad, bahwa kejadian luar biasa pada masa lalu ( mukjizat) yang dialami oleh para nabi, zaman sekarang harus bisa dipahami secara rasional.
Di dalam penelitian tesis ini memakai analisis-deskriftif yang berkaitan dengan pendapat penafsiran Muhammad Asad mengenai ayat-ayat yang berkaitan dengan mukjizat para nabi di dalam al-Qur’an, langkah yang diambil oleh penulis di dalam proses pengumpulan data adalah dengan mencari kata mukjizat dalam al-Qu’ran, seterusnya menncoba melihat pembahasan mukjizat para nabi dalam al-Qur’an, kemudian langkah selanjutnya adalah mencoba menganaslisis penafsiran Muhammad Asad dan membandingkan dengan penafsiran-penafsiran yang sudah ada baik penafsiran sebelum Muhammad Asad atau penafsiran setelah Muhammad Asad.
Semua ayat yang berkaitan dengan kejadian luar biasa, yang menimpa para nabi. Muhammad Asad terkadang merujuk pada penafsiran-penafsiran sebelum dirinya yang sependapat dengan penafsirannya, mengutif dari Bibel, mencari makna kata dll, agar penafsirannya rasional.
Muhammad Asad, dalam menafsirkan ayat-ayat alqur’an mengenai mukjizat para nabi, menggunakan pendekatan ilmiah yaitu peristiwa-peristiwa alam dan banyak juga menggunakan bentuk-bentuk penafsiran alegoris. Sehingga muncul sebuah penafsiran yang rasional.
ENGLISH :
Khawariqul 'Adah or it is termed an extraordinary event that Allah gave to the prophets as proof of his prophethood before his people when the prophet was sent. Something that is beyond reason or irrational (does not make sense), or khawariqul 'adah. Like Prophet Ibrahim A.s, who was not injured at all by fire when burned by his people and Prophet Isa As. Who can bring the dead to life, or when the Prophet Musa A.s split the sea with his staff while being chased by Fir'awn and his troops, and many other prophets who received miracles from Allah SWT. on the one hand the miracle is an unreasonable incident but there are commentators who try to rationalize the miracle verses of the prophets so that reason can be understood, like what Muhammad Asad disclosed, that extraordinary events in the past (miracles) were experienced by the prophet, today must be understood rationally.
In this thesis research, using descriptive analysis related to Muhammad Asad's interpretation of the verses related to the miracles of the prophets in the Koran, the steps taken by the author in the data collection process were to look for the word miracle in al-Qu'ran, then tries to look at the discussion of miracles of the prophets in the Koran, then the next step is to try to analyze Muhammad Asad's interpretation and compare it with existing interpretations, either pre-Muhammad Asad or after Muhammad Asad.
All the verses relate to the extraordinary events that befell the prophets. Muhammad Asad sometimes refers to his prior interpretations that agree with his interpretation, curse from the Bible, look for the meaning of words etc., so that the interpretation is rational.
Muhammad Asad in interpreting the verses of the alquran regarding the miracles of the prophets, used a scientific approach, namely natural events and also used many forms of allegorical interpretation.
ARAB :
خوارق اعادة أو ما يسمى بحدث غير عادي أعطاه الله للأنبياء كدليل على نبوته على قومه عند إرسال النبي. ما هو فوق العقل أو غير منطقي ، أو خوارق الصلاة. مثل النبي إبراهيم عليه السلام ، الذي لم يصب إطلاقاً بنيران أحرقه قومه ونبيه عيسى عليه السلام من يستطيع إحياء الموتى ، أو عندما شق النبي موسى البحر بعصاه أثناء مطاردته من قبل فرعون وجنوده ، والعديد من الأنبياء الآخرين الذين تلقوا المعجزات من الله سبحانه وتعالى. من ناحية ، المعجزة حادثة غير معقولة ، لكن هناك مفسرين يحاولون تبرير آيات
معجزات الأنبياء بحيث يمكن فهم العقل ، مثل ما كشفه محمد أسد ، تلك الأحداث غير العادية في الماضي (المعجزات) التي مرت بها. الأنبياء اليوم يجب فهمهم بعقلانية.
يستخدم البحث في هذه الرسالة التحليل الوصفي المتعلق بتفسير محمد أسد للآيات المتعلقة بإعجاز الأنبياء في القرآن ، والخطوات التي اتخذها المؤلف في عملية جمع البيانات هي البحث عن كلمة معجزة في ثم يحاول القرآن أن ينظر في مناقشة معجزات الأنبياء في القرآن ، ثم الخطوة التالية هي محاولة تحليل تفسير محمد أسد ومقارنته بالتفسيرات الموجودة ، سواء قبل محمد الأسد أو بعد محمد أسد.
كل الآيات تتعلق بالأحداث غير العادية التي حلت بالأنبياء. يشير محمد أسد أحيانًا إلى تفسيراته السابقة التي تتفق مع التفسير ، ويلعن من الكتاب المقدس ، ويبحث عن معنى الكلمات ، وما إلى ذلك ، حتى يكون التفسير عقلانيًا.
استخدم محمد أسد في تفسير آيات القرآن الخاصة بمعجزات الأنبياء منهجًا علميًا ، أي الأحداث الطبيعية ، كما استخدم العديد من أشكال التفسير المجازي
Design Approaches to Improve Organic Solar Cells
No full textOrganic solar cells (OSC)s are valuable economical and environmental friendly devices capable to generate electricity from sunlight. This is because of their simple fabrication process and minimal material usage in comparison to the inorganic solar cells. OSCs have not been widely commercialized yet because of their relatively low power conversion efficiency and stability problem. It is expected that these obstacles will be surmounted in a foreseeable future upon rigorous research studies performed in the field. This paper is devoted to reviewing the design related strategies that can be taken to enhance OSC performance. These strategies can be accomplished through modulating the architecture of the devices and by considering the alignment of the molecular energy levels between their active layer components
Effect of Surface Modification on the Absorption and Luminescence Response in tris(8-Hydroxyquinoline) Gallium Films Achieved by Thermal Treatment
No full textThis work reports on the impact of surface modification on the optical absorption and luminescence response of vacuum deposited tris(8-hydroxyquinoline) gallium (Gaq3) films. This surface modification was achieved by means of thermal treatment under nitrogen gas in the temperature range from 85 oC to 255 oC. The results of field emission scanning electron microscopy (FESEM) and x-ray diffraction (XRD) technique ascertained the formation of amorphous nano-rods along the surface of Gaq3 films. Considerable improvement in the absorption and luminescence characteristics of Gaq3 films was observed upon surface modification, which has been resulted from this treatment process
Utilizing a simple and reliable method to investigate the optical functions of small molecular organic films – Alq3 and Gaq3 as examples
No full textTuning the optical band gap of DH6T by Alq3 dopant
No full textDihexyl-sexithiophene (DH6T) was doped with tris (8-hydroxyquinolinate) aluminum (Alq3) to prepare blends of DH6T/Alq3 by dissolving the mixture in the chloroform/hexane co-solvent. Solid films with different thickness deposited on quartz substrates were obtained from the blends via casting process. Optical absorption spectroscopy has been performed to measure the optical band gap of pure and doped DH6T as well as variations in the band gap with dopant concentration (weight %). This variation in optical band gap with dopant concentration was determined quantitatively with fitted and extrapolated techniques and observed qualitatively from the red shift appeared along the optical absorption spectra.The results showed that within a specific dopant content, the optical energy gap, Eg of DH6T decreases from 2.69 eV to 1.8 eV with increasing dopant concentration to 23.1%
Effects of thermal annealing on the optical, spectroscopic, and structural properties of tris (8-hydroxyquinolinate) gallium films grown on quartz substrates
No full textPhotovoltaic performance of organic solar cells based on DH6T/PCBM thin film active layers
No full textOptical Response and Photovoltaic Performance of Organic Solar Cells Based on DH6T:Alq3 Active Layer
No full textThis research work reports on the optical and photovoltaic performance of dihexyl-sexithiophene (DH6T) doped with various molar percentages of tris-8-hydroxyquinolinate aluminium (Alq3) dissolved in chloroform/hexane co-solvent. Films of DH6T(1-x)Alq3(x) composite have been produced by casting technique aiming at investigating their absorption edge energies (Eabs) and hence identifying the optimum content of Alq3. It was found that by introducing a controlled amount of Alq3, the value of Eabs can be tuned from 2.69 eV to 1.76 eV. An empirical equation was derived to fit the obtained experimental data, by which an optimum Eabs at molar concentration of (x ≈ 25%) was predicted. Finally, organic solar cells based on the optimum active layer content were fabricated and tested. Comparably, it was observed that the photovoltaic performance of the DH6T:Alq3 based devices is much better than that achieved for the DH6T:PCBM based ones. Efficiency and fill factor for the devices based on DH6T(0.75)Alq3(0.25) active layer were found to be 0.22% and 26.5%, respectively, while those for DH6T:PCBM based devices were about 0.01% and 24%, respectively
