During the last decade, different structures of photovoltaic (PV) cells fabricated from organic semiconductors have drawn tremendous economic and scientific interest due to their high optical absorption efficiency, low fabrication cost, lightweight, high mechanical flexibility and continuous growth of their power conversion efficiencies. Bulk heterojunction organic solar cells can be fabricated by simple processing techniques, such as, screen printing, spin casting, etc., and, therefore, are potential candidates for the mass production of flexible and cost-effective devices. In this dissertation, based on the soluble macrocyclic organic semiconductors 5,10,15,20- tetraphenyl-21H,23H-porphine zinc (ZnTPP) and copper (II) tetrakis (4-cumylphenoxy) phthalocyanine (Tc-CuPc) bulk heterjunction structures of ITO/PEDOT:PSS/ZnTPP:PCBM/Al and ITO/PEDOT:PSS/Tc-CuPc:PCBM/Al were fabricated employing spin casting and vacuum thermal evaporation techniques. The effect of donor to acceptor (D:A) mass ratio was investigated on photovoltaic properties of the ZnTPP:PCBM BHJ solar cell and the optimum D:A ratio was identified. Effect of the thickness and surface morphology of the active layer on the photovoltaic properties of this porphyrin-fullerne BHJ was also studied and the optimum active layer thickness was identified. Bulk and hybrid-bilayer heterojunctions of copper (II) tetrakis (4- cumylphenoxy) phthalocyanine (Tc-CuPc) and vanadyl 2,9,16,23-tetraphenoxy- 29H,31H-phthalocyanine (VOPcPhO) heterojunctions were also fabricated. Temperature dependent electrical properties of these devices and optical performance of the Tc- CuPc:PCBM bulk heterojunction was also investigated. Macrocyclic semiconductors e.g. metallo-phthalocyanines (MPcs) and metallo- porphyrins (MPPs), are restricted to dry processing techniques due to their insolubility in common organic solvents. Thus MPcs and MPPs are used in typical thermally evaporated donor-acceptor bi-layered solar cells. The performance of bi-layer solar cells is low due to small exciton diffusion length; only the excitons generated within 10 nm from the D/A interface are expected to contribute to photocurrent. This issue is resolved in BHJ architecture, in which the D-A interfacial area is distributed throughout the volume (bulk) viiiof the active layer. In other words the D-A interface is brought near to the exciton generation site. Soluble versions of MPcs and MPPs can be helpful to study their opto- electronic characteristics in BHJ solar cell architecture. In BHJ architecture there is a lot of flexibility and ease for rapid research e.g. changing solvent, varying concentration, using different D to A mass ratios, changing active layer thicknesses by spin coating at different speeds, incorporating different exciton-blocking layers etc. A lot of variations can be studied in a very short time and with less cost. However, as more and more research groups start studying soluble macrocyclic organic semiconductors in BHJ solar cells, further efficiency improvements and availability of new soluble macrocyclic materials are worthwhile. Since the microstructure of bulk heterojunction layer is strongly dependent on the donor to acceptor (D:A) mass ratio, an optimum D:A ratio improves device performance by improving the charge separation, transport and collection process. As one aspect of this research work, porphyrin-fullerne BHJ solar cells with ITO/PEDOT:PSS/ZnTPP:PCBM/Al structure were fabricated with different D:A mass ratios and their optical parameters were measured both under simulated solar spectrum AM 1.5G and monochromatic illuminations. The active layer thicknesses were extracted from their respective optical reflection and transmission measurements using average absorption coefficient. Scanning electron microscope (SEM) image of the device cross section was studied to verify layer thicknesses and examine the quality of layers. Effect of thermal annealing on performance of some devices was also studied. Incident photon- to-current conversion efficiency (IPCE) spectra at different D:A ratios was determined. On basis of the measured optical parameters such as fill factor FF, open circuit voltage V OC , short circuit current density J SC , and power conversion efficiency η , the optimum D:A ratio was identified. Maximum IPCE value of 21% was obtained for D:A ratio of 1:9 which lead to PCE of 0.21% which was 36 times better than a previously reported value in which C 60 was used as acceptor. Also incorporating PCBM as the acceptor instead of C 60 improved the open circuit voltage (V OC ) for all the D:A ratios. The reason for high V OC is greater difference between the ZnTPP HOMO and PCBM LUMO . Furthermore the 1:9 devices showed consistency in optical parameters when reproduced.
ڈاکٹر سید محی الدین زور قادری اردو زبان کے مشہور خدمت گذار اور نامور صاحبِ قلم ڈاکٹر سید محی الدین زور قادری کی وفات دنیائے اردو کا بڑا سانحہ ہے، انھوں نے علمی اور عملی دونوں حیثیتوں سے اردو زبان و ادب کی بڑی خدمت کی، وہ دکن کے مولوی عبدالحق اور دکنیات کے خصوصیت کے ساتھ بڑے ماہر تھے، قدیم دکھنی اردو کی بہت سی نادر کتابیں انھوں نے شائع کیں، ان کاسب سے بڑا کارنامہ ادارۂ ادبیاتِ اردو حیدرآباد ہے، اس ادارہ نے اردو زبان و ادب کی جو گوناگوں خدمات انجام دیں، اس کی مثال اردو کے اس کی عمر کے اداروں میں نہیں مل سکتی، اس کی․․․․․․․ حیثیت دکن میں وہی ہے، جو شمالی ہند میں انجمن ترقی اردو ہند کی ہے اور آج اندھراپردیش میں اردو کا وجود اور اس کا وقار اسی ادارے کے دم سے قائم ہے، ڈاکٹر زور کی مستقل تصانیف اور ان کی مرتب اور شائع کردہ کتابوں کی تعداد ایک درجن سے زیادہ ہوگی، وہ حیدرآباد کے ایک خانوادۂ مشائخ سے تعلق رکھتے تھے، اسی نسبت سے اپنے نام کے ساتھ قادری لکھتے تھے، اور اس سلسلہ کو انھوں نے قائم بھی رکھا تھا، چناچہ ان کے بڑے صاحبزادے ان کی خاندانی خانقاہ کے سجادہ نشین ہیں، مگر ان کی علمی و ادبی شہرت نے ان کی اس حیثیت کو اتنا چھپا دیا تھا کہ اس کا علم بھی بہتوں کو نہیں ہے، اﷲ تعالیٰ ان کی مغفرت فرمائے۔ (شاہ معین الدین ندوی، اکتوبر ۱۹۶۲ء)
It is incontrovertibly true that Islam advocates peaceful coexistence with the adherents of other creeds. The holy Qur’an, the primary source of Islamic Shari‘ah, vividly recommends freedom of conscience and religion. Similarly, the prophet (SAW), being the perfect role model for the entire humanity, preached and practiced the lofty ideals propounded by the holy Qur’an and peacefully coexisted with the followers of Judaism and Christianity. Furthermore, the four rightly guided caliphs exhibited tolerant attitude towards their Jews and Christian subjects. In the presence of these models, nonetheless, many contemporary critics of Islam are disinclined to admit this explicit reality. Robert Spencer also sees eye to eye with them. Robert Spencer is an American author and he has published twelve books. He is a member of Melkite Greek Catholic Church. He looks on Islam as a highly intolerant religion. In this connection, he singles out Muhammad’s (SAW) treatment of various Jewish tribes. He maintains that all Jewish tribes viz. Banu Na╔hir, Banu Qaiʽn┴q┐ʽ and Banu Qurai╔ah “received the wrath of Muhammad”. This brief study aims to prove that the treatment meted out to the Jews was not founded on religious prejudice and malice; it was rather commensurate with their wicked demeanor.
The study was conducted to compare public and private sector college practitioners’ professional identity and professional learning practices. The objectives of the study were: to compare college practitioners’ professional identity in public and private sector, to compare their professional learning practices, to examine practitioners’ views about the value of professional learning practices, to compare discrepancies in practitioners’ professional identity and professional learning practices, to compare discrepancies in practitioners’ learning practices and the level of values they give to these practices, to investigate practitioners’ views about effect nal identity with the reference of professional learning practices on institutional environment, to compare college practitioners’ views about continuous professional development activities for professional growth. The population of the study comprised male and female college practitioners serving in public and private colleges located in District Jehlum. The whole population was taken as sample of the study. Data were collected from 633 public and private sector college practitioners through disproportionate stratified sampling technique by using selfdeveloped questionnaire. Data were analyzed through Statistical Package of Social Sciences (SPSS) by applying independent sample t-test, paired sample t-test and One way ANOVA. Major findings of study were that there was no significant difference in professional identity of public and private sector practitioners; however, private sector college practitioners were found more concerned about in improving themselves; they were more interested in professional learning practices and gave more value to professional learning practices than public sector practitioners. Male practitioners’ professional identity level was found higher than females. No gender differences were found in professional leaning practices. It was concluded due to job security, public sector practitioners were no more interested in improving their practices. However, as the survival of private sector practitioners in organization depend upon their performance, so they were more interested in improving performance through professional learning practices. It was suggested that college practitioners, especially of public sector, may be provided training for enhancing professional identity and professional learning practices through collaboration with universities and Higher Education Commission, Pakistan.