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Synthesis and Characterization of Metal Based Chalcogenide Thin Films for Solar Cell Application

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Author

Nisar Ali

Program

PhD

Institute

University of the Punjab

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2013

Thesis Completion Status

Completed

Subject

Physics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/2753/1/2910S.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727451848

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To reduce the cost of expensive solar cells, new, cheap, nontoxic and more abundant new materials have been proposed as suitable to use as absorber/window layers in solar cells. One such new material as absorber layer is tin antimony sulphide. We have attempted two methods for the growth of these films. A two stage process involving combinatorial sputtering of metallic targets tin and antimony followed by sulphurization by heating libraries in the presence of elemental sulphur in vacuum thermal evaporator. The sulphurized films were annealed for 1 hour in sealed quartz ampoule containing argon gas at low pressure (̴ 1 atm) at 425°C, 450°C, 475°C, 500°C and 525°C in tube furnace The 2nd method of combinatorial tin antimony sulphide thin films deposition is vacuum thermal evaporator. Thin films of Sn-Sb-S were synthesized on soda lime glass substrate from SnS and Sb2S3 binary compounds. SnS and Sb2S3 were evaporated in vacuum chamber at 10-4 torr without substrate heating simultaneously. The films were annealed in argon atmosphere at 85 °C, 105°C, 150°C, 275°C and 325°C inside glass ampoules. The elemental composition of the films was characterized by EDX and the XRD analysis was done for crystallographic phase’s confirmation. The XRD pattern of combinatorial tin antimony sulphide thin films shows that the as deposited films are amorphous while the low annealed temperature thin films are poly crystalline. The optical properties and thickness of the films were measured by ellipsometry techniques. Electrical properties were calculated from photoconductivity and hot point probe measurement. The photoconductivity of the library was calculated by photoconductivity spectrometer while hot point probe was used for the type of conductivity. It was found that Sb2Sn5S9 is a good candidate for photovoltaic application with a band gap of 1.15-2.5eV, absorption coefficient above 105cm-1, transmittance above 700nm and whose conductivity changing from n-type to p-type at high annealing temperature (325°C). The effect of air annealing of tin antimony sulphide was also studied in the current study. Tin antimony sulphide (SnSb2S4) thin films were deposited on glass substrate and annealed thermally at 150°C, 200°C and 300°C. The 300°C annealed films have good photoconductivity response and low transmittance. The band gap calculated by ellipsometry technique was found in the range of 2.65eV-1.45eV. The absorption coefficient of the films is ~105cm-1 while the refractive index and other optical properties of the library presented have good results. The influence of temperature dependence on Cadmium Sulfide deposited on corning 7059 glass substrate (1500C to 3000C) was also studied in this study. Transmittance, absorbance, band gap and reflectance were obtained by UV spectroscopy. The transmittance for 300nm to 1100nm thickness was grater then 80%. The resistivity and mobility was calculated by Vander Pauw method which were 10-80 Ωcm and 2-60 cm2V-1S-1 respectively. The thermoelectric properties of the film were measured by hot and cold probe method which shows the n-type nature of the film
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ہر غم ہنسی کے پیچھے چھپانے سے میں رہا

ہر غم ہنسی کے پیچھے چھپانے سے میں رہا
اس بار زندگی کو نبھانے سے میں رہا

دیتا بھلے ہے تیری جفا کا دھواں یہ اب
پھر بھی چراغ ِ عشق بجھانے سے میں رہا

اب ماند پڑ گئی ہیں مری سب حرارتیں
اس شخص کو تو روز منانے سے میں رہا

جن میں ہے تیرے لمس کی خوشبو بسی ہوئی
اے یار! اُن خطوں کو جلانے سے میں رہا

گر تیری شرط ہے کہ یہ حل ہوں گی اشک سے
ان مشکلوں پہ اشک بہانے سے میں رہا

ان سب اذیتوں نے تو پاگل ہی کر دیا
ہوش اپنے اب ٹھکانے پہ لانے سے میں رہا

حساسیت سے چیخ کے یہ کہہ رہا ہوں میں
گر یہ زمانہ ہے تو زمانے سے میں رہا

مانا کہ فہد ؔزندگی بھی ہے بہت کٹھن
پر آسماں تو سر پہ اُٹھانے سے میں رہا

امام محمد اور ان کی قرآن فہمی

If any nation has right to be proud of its inheritance of concern and religion so followers of Islam deserve of its glorious inheritance of concern or concentration which is according to international investment enlists the unique and individual employment in the history of human. Its infrastructure, core concern, flexibility, exclusive law ideology, judiciary, common and uncommon solution contains unique supremacy. The base of such amazing and awesome international investment depends on fundamental legislative of Quran. Therefore, such accumulated ideology of all investment, although having opposition and distance owes the struggle and efforts of plenty of religious scholars (Fuqha) who proved surpassing sincerity for the services of knowledge. Imam Muhammad Bin Hassan Shebani the first of these (Fiqah People)eligious scholars who compressed (Islamic Fiqah) Islamic scholars teaching in such an educational way as none of other did it. He left us such a memorable priceless and valuable inheritance which crystal clear proof that he was having the thoughtful legislative mind and had profuse passion of gaining knowledge though he faced massive difficulties even spent his money to acquire knowledge. Besides such prestige and wisdom he was well-versed in Fiqah (deep thinking). His knowledge and services of Fiqah can be manipulated by his figurative and descriptive books which are real assets and fundamental ideology of followers of Imam Abu Abdullah Muhammad bin alhasan alshaibai recently in the explanation ofKitab ullah Imam Muhammad was not uncommon writer that is why he was as much famous but Imam Muhammad was supposed to be best scholar of it.

Molecular Characterization of Resistant and Susceptible Sugarcane Saccharum Hybrids L. Cultivars to Smut Disease

Sugarcane (Saccharum hybrids L.) is a highly treasured perennial crop and happens to be the economic backbone of many countries including Pakistan. Apart from abiotic factors, diseases inflicted by fungal, bacterial or viral pathogens have the most damaging effect over the growth of sugarcane. Whip smut of sugarcane is one such disease caused by fungus Sporisorium scitamineum which posses a major threat to cane yield. The most effectual remedy to tackle the problem is to develop resistant cultivars that stand a far greater chance of surviving the disease outbreak.The advent of molecular marker techniques has massively enhanced the process of selection for disease resistance in sugarcane employed in breeding programs. The current work was a small contribution towards the same goal and exploited the potential of molecular markers to distinguish between smut resistant and susceptible cultivars of sugarcane. Moreover, identification of Resistance Gene Analogues (RGAs) was another strategy to understand the defense mechanism utilized by the crop. The initial screening experiments to differentiate between two completely resistant and two completely susceptible Pakistani cultivars involved detection of DNA polymorphism among the respective samples using 200 RAPD primers. Forty four of these primers turned out to be highly polymorphic, 20 of which produced trait specific loci in the four sugarcane genotypes. Furthermore, it was discovered that decamers A-20, E-05 and OPAV-10 produced 4 loci linked with resistant cultivars, while 4 loci were generated by primers B-17, OPAD-01, OPAD-13 and OPAX-14 specific to susceptible cultivars. However, primer A-09 amplified 2 markers of 1200 bp and 500 bp from resistant and susceptible cultivars, respectively. The disparity between resistant and susceptible cultivars was further highlighted when cluster analysis separated the two genotypes into two discrete groups. In order to detect RAPD markers associated with smut resistance phenotype in sugarcane, six pooled bulks of DNA from Pakistani cultivars (i.e. comprising 2 completely resistant, 2 completely susceptible, 4 moderately resistant and 4 moderately susceptible genotypes) and USA cultivar (i.e. containing 5 resistant and 5 susceptible clones of LCP85-84 F2 mapping population) were prepared. The screening of the six DNA bulks with 500 arbitrary decamers eventually revealed two RAPD markers (B-17 and I-20) linked with smut responses in Pakistani and USA cultivars, respectively. The marker B-17 produced a reproducible polymorphic fragment which appeared to cosegregate in repulsion with sugarcane smut resistance in Pakistani cultivars. On the other hand, RAPD decamer I-20 was tightly linked with resistance in smut resistant clones of USA cultivar LCP85-384 F2 population. Two Sequence Characterized Amplified Region (SCAR) markers were designed from the sequences of B-17 and I-20 products and were found to be specific to resistant cultivars of Pakistan and resistant clones of LCP85-384 F2 population, respectively. The SCAR marker developed from B-17 sequence was used to screen seven additional sugarcane cultivars of Pakistan with SCAR marker, verified the earlier findings by showing essentially similar results.In order to conduct further study, ten sets of oligonucleotides were designed to tag the nucleotide-binding site attached to leucine-rich repeat (NBS-LRR) domain of RGAs (resistance gene analogues) and other related sequences reported in the members of family Poaceae (maize, rice, sorghum and foxtail millet). The PCR amplifications of Pakistani and USA cultivars using these 10 primers resulted in the identification of three RGAs (MRGA3, MRGA5 and MRGA2) showing discriminating products with respect to smut resistance trait in sugarcane. The sequences of three isolated RGAs were analyzed and compared with that of documented R genes. The results of NCBI blast, multiple sequence alignment and phylogenetic analysis showed sequence homology of the three RGAs with reported R genes and RGA-like sequences. The final study was based on targeting sequences in sugarcane genome which may have a part to play in the resistance mechanism of plants against fungal attack. These sequences included a reported SCAR marker linked with covered smut resistance in barley and a canecystatin partial mRNA sequence. In a nut-shell, our study provided molecular basis to distinguish between smut resistant and smut susceptible sugarcane cultivars of both Pakistan and USA.