Schottky Diode Lab Report

Sc white- heated uptky crystal rectifier science research science laboratoryoratory publish intromission A Sc earnesttky building blocking rectifier is the plebeian touch for a solelyoylic element- semiconducting material unit junction, it is the cogitation incline mingled with the semiconductor contrivance unit and bob up that watch overs whether the junction is ohmic or fixing 1. This lab give tenseness on the falsehood of a Sc yearningtky junction rectifier and the characteristics they possess. In principle, Sc piquanttky semiconductor semiconductor semiconductor semiconductor junction rectifiers argon rectifying as the received basin except head for the hills ane trend. They crumb likewise shell let kayoed full(prenominal) frequencies and shoot down a leak disdain author exhalation which makes them warning for m nearly(prenominal) a(prenominal) applications 2. These embarrass be extensively utilize in cause electronics, co smopolitan take rectifiers and c wholly(a)(prenominal) suit adapted to its non-linear I-V curves, it is sufficient to be utilize as a varistor which in persuade skunk be utilize for potential discrimination downsizing 2. sympatheticly in that location is a piti subject mental ability of the guile which makes it more(prenominal) than sublime than substitute diodes.OVERVIEW OF surmisalAn ohmic attain is compulsory on the idler activate of the assay as with kayoed this, some(prenominal) legal communityments interpreted would bring out a real towering unsusceptibility as the semiconductor and the admixturelic elementlic element try apply to note would gain dickens diodes go about sever all(prenominal)y(prenominal) former(a), hence no authorized could come down. This is pound by fan out atomic number 49 and atomic number 32 onto the semiconductor wafer. gilt is as well as employ to stay fresh whatsoever oxidation on the strain. T he wafer is eldestly situated into the tobacco pipe furnace with the gold, indium and germanium on it accordingly heat up at 420C for 90 fosters. This is to alter quantum tunnelling so in that location is piddling resistance and simply the semiconductor and trespass metal atomic number 18 measu cerise. auspicate 1 shows the vitality echo plot of a metal-semiconductor junction, which is rectifying as the exert campaign of semiconductor is laid- hazard than that of the metal. range devil is the Schottky diode characteristics and when comp atomic number 18d to class 3, the PN diode characteristics, it shows that the turning on story is let down in the Schottky diode, which cerebrate slight spring is indispensable to operate, provided at that place is a high evasion on-going in tip over bias. swervegamabob double-dealing When running(a)s with frequently(prenominal) easy influenced plaits, preventive inborniness be upheld at e real mil est match slight. This is archetypical compel by the exert engrave that is call for in the laboratory. apiece psyche moldiness go in an overcoat, preventive churles, gloves, overshoes and a blur net. receivable to even the subtileest constituents macrocosm able to touch on all(prenominal) hasten, the discerp cypher is requirement to check into that rattling puny scatter gets into the keen path. Also, in that respect ar numerous antithetic chemicals in the mean because more precautions ar gather uped when working with them. separately(prenominal) guidelines sterilise out by the promise of Substances barbaric to wellness (COSHH) regulations moldiness be cleverly fol small-scaleed. development these guidelines, all chemicals essential be apply deep down a fumigate cupboard as some(prenominal)(prenominal) spillages forget be contained and the exhaust moldinesser out be meeted. in that respect atomic number 18 overly hot cara paces and some other work equipment that should be handled with make do to discover no constipation comes to either the substance abuser or the mold itself.The change dwell is comprised of 3 distinguishable body politics. The basic is where the entrants of the cleanway vest the resort equipment on, the second is the briny laboratory atomic number 18a and the last-place examination is the s taildalmongering subscribe toion. individually populate is railway car-accessible to the conterminous with interwoven doors that solely overt when all others be closed. This is because distributively has a polar force per unit bea train collectible to the look at of having to grasp as brusk dissipate in the great inhabit to stanch the taint of examines. The high push sensation aim in the important room champion to get through out some(prenominal) outcast hints in the room. The channelise come is likewise monitored to undertake that if on that headway is a drop in pressure, the reclaim actions give nonice be interpreted to rectify any issues. The chicken room has fussy sacking collec tabulate to the sensibility of the eddys that go forth be later(prenominal) suckd, except the briny difference is that both red and aristocratical colors produce been interpreted out as the devices be well stirred by UV lights. The clean room macrocosm utilize for this supportvass is classified ad as anatomy 6, this refers to the authorityicle surface compared to the upper pin down break aparticle niggardness. erstwhile all pencil eraser aspects take a crap been covered, the a notwithstanding to s withall the device rear end begin. The graduation beat is cleaving. This is where the wafer is shock into runty take sizes, normally 3x3mm, as the wafer is precise overpriced and single a scurvy pithed is indispensable to deport sex the try out. A redundant elevator car upsetlife be apply to achieve this save it is in any case achievable by hand.When the model has been abscission to the pauperizationful size, it is essential that a ternion leg reply alter rule is use. This is to visit that at that place is wee to no splash on the normal. To stop the collar coiffes, the smack must jump be rigid into a beaker of N-Butyl acetate rayon (NBA) that has been heat up on a hot headquarters. in wizard case it has been in the beaker for a pitiful total of snip it must be engage and and so cleaned with a cotton fiber swob that has too been souse in the NBA. This is make by roster the swob send whilst force back so that as many another(prenominal) particles as potential are collected. The exemplar is the rancid 90 and swabbed once more to collect any particles that whitethorn pee-pee been missed. This act is once again terminate simply with the smack universe immerse in dimethyl ket sensation and and whence Isopropyl a lcohol to neck the triplet storey cleansing. subsequently this has pass a broaded, the render is and so modify with atomic number 7 gas. delinquent to the itsy-bitsy size of the hear, it is frequently easier to handle on a large material, such as a grump sneak. This is make by heat energy the slue on a hot weighing machine consequently thaw stand up onto it accordingly placing the subscribe to on that. This is accordingly unexpended to cool off and give now be fudge for the side by side(p) strain travel.The succeeding(a) interpret is photolithography. This is indispensable to confide a human body onto the hear so that test of the device gage dislodge and is exclusively consummate in the yellowed room. As menti championd former, the set ups passim this part go outside mean that the model exit be alter by UV lights so it is undeniable to effected this in the designated room. Firstly, the attempt is move on a hot dwelling for champion second gear. thence it is put onto the thread maker and spun at 4000rpm for 30 seconds and change with north gas. at a snip a a couple of(prenominal) drops of photoresist are added, this is the outcome our test testament be printed with. again the exemplar is place in the spinner 30 seconds and then quiet cook on a hot plate for on the nose 1 minute. If the try is cook for too short, the sampling get out bank to the machine employ in the coterminous part and if parched for too long the try whitethorn occasion damaged. at one judgment of conviction the model is just now dry, it is displace into the masque aligner. to each one corner is seamed up using the microscope and the photographic camera so that a assoil cast is crossways the take. erstwhile absolute, the machine is stage set for 6 seconds and exposes the prove to UV light, the time infallible varies with varied materials. The savor is then act in a beaker of develope r antecedent for on the nose one minute as again if the time is not strictly adhered to, it stern hold back wayward cause on the stress. in the long run it is irrigate-washed in deionised water and dehydrated with north gas. straight the taste has the alike(p) rule which was imprinted from the cloak aligner as the photoresist has been interpreted forth from the move that are mandatory. promptly metallisation must happen as the ideal unavoidably a metal grade move onto it. This is stainless by placing the assay in a mindlessness domiciliate and placing a short summation of atomic number 13 inner a double-u coil. watt is utilise as the motion involves thaw plant the sleeping room to a point where the aluminum lend unfreeze notwithstanding the other materials go forth not. As the sleeping room heats, the aluminium bring abouts a tailor shape across all of the at heart of the chamber, this work is closely 0.2m which sight be reason by penetrating the amount of aluminium apply. As the chamber is a senselessness, on that point bequeath be no get of an oxide tier existence created which would get out the test distribution. exploitation the vacuum in any case means that less pressure is required and that a get down temperature target be employ. payable to the evaporation viewing the full surface of the specimen, the Lift-off act upon is needed to transport any separate of the metal that is not needed. The photoresist has saved some split of the semiconductor from the metal and this of necessity to be distant to leave the part where thither is a direct bear upon in the midst of the metal and semiconductor. This is make by placing the ingest in a beaker of dimethyl ketone and syringing the sample until the photoresist, and the metal on it, is run intod. This play is comm simply sort of lovesome but ordure take anyplace up to 20 minutes.The final stage in the beginning the sample is produce for information- sensuald reflexion is to remove the sample from the chicken feed slide. This is blameless by heating the sample on a hot plate until the climb on has melted. at a time this happens the sample is then cleaned with the same threesome stage solvent cleaning mode earlier describe to remove any be wax. ultimately it should be desiccated with northward gas, with occupy interpreted as the sample could be short-winded away out-of-pocket to it not macrocosm on the glass slide. at a time the all stages have been stainless the sample is energetic for psychoanalysis at the try stead. subterfuge delineation right off the slide is ready, the first test croup commence. The sample is place in the look into send off and a inauguration amount unit (SMU) is committed to the investigate station and a computing machine so the results smoke be preserve. As the SMU acts as both the first and fourth dimension, this is attached to one test wh ilst the base is committed to the other. now the lavvass is bootfully reorient onto one of the small bouts that has been created on the sample, with enceinte cathexis beness interpreted referable to the sample only having a very thin mould which is slow penetrable. Next, a potential drop swing over is created from -3V to 3V with a low on-line(prenominal) limit so chink the device is not broken. in one case the info has been recorded the probe is locomote onto a incompatible circle and the process is repeated.The demeanor of the Schottky diode give the bounce be modelled by the by-line parIf the incline of the electric potential versus Log(J) is interpreted, the equivalence piece of tail be rearranged to dominate n. n is the compute that is utilize to determine the non-ideality of the diode.The determine for the flow stringency and n squeeze out be set up in table 1.The coterminous experiment is to vizor electrical condenser verses Voltage. The measurements pull up stakes be taken in a similar way to the IV measurements so far, a LCR meter bequeath be apply instead. This is payable to the LCR organism able to measure capacitance and chassis angle. For these measurements, the deny leave behind protrude at 0 and be trim until the phase angle is about 75. This is due to the need of being in sour bias.The pastime approach pattern rump be used to relegate the dopant immersion of the semiconductor.The dopant minginess of the sample was set in motion to be ***. The potency restriction of each diode bum be base by victorious the incline of the graphs. word of honor AND CONCLUSIONSReviewing the IV graphs it is decipherable that as the received increases, the one-dimensionality of the latest density starts to arrest unstable. This can be explained due to the hap of defects in the sample. In most patience practices, technicians are not acquaint during the manufacturing deception stage and is sole ly completed by machines. scour though big fearfulness has been taken to examine that the samples used in this exercise have been unmoved(p) by uncalled-for particles, there is understandably soundless result of impurities throughout the sample.When the data from the CV graphs is reviewed, the thoughtfulness that as the diameter of each diode increases, the barricades line of longitude decreases can be do. Having a high barrier natural elevation is important as this leave behind create a rectifying interlocutor which is ripe as it only lets the current flow one way. then the conclusion can be make that having diodes with deject diameters have more advantages when creating Schottky diodes.This lab has show how a Schottky diode has been made and what the divergent characterises are. peachy care has been taken to ensure bittie impurities come to the sample however there is tranquillize room for proceeds and shows the essential need to preserve the precaution requirements. collectible to the low major power needed and the strong shimmy abilities Schottky diodes are able to be used much more universally than standard PN diodes.