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crystallography

crystallography - The design of this cube has The...

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Unformatted text preview: / The design of this cube has The PowerPoint file used to been adpoted directly from construct this figure is the one made by Kris Pister included with the archive ([email protected]). you can download from: I have added color and http://www.ee.ucla.edu/~jju reduced the information dy/classes/crystal__cube/ dISPIayed to oilly ihe . If you have good ideas on crystallographic directions . and planes how to improve the ' usefiilness and instructive It is best if you can print ability of this cube, please this out onto a color make the necessary transparency (ink jet print modifications to the will work fine). When assembling, do so with the ink side of the transparency on the inside of the cube! To use the cube you must read the interior walls... powerPoint file and email it to me. I will attempt to incorporate all if your suggestions. Jack W. Judy, UCLA, 10/98 To hold it together, use a tape that is very transparent, such as Scotch Transparent Tape 600, and tape the flaps onto the outside of the cube. To make it clearer, cut the flaps just inside the dashed line to avoid incorporating them into the final structure. ; L Visualizing Silicon Crystallography — use crystal cube cube (adapted from Kris Fish) — use inkjet transparency — assemble inside out — use clear tape - can visualize directions, orientation. and intersection of all the different planes begin with the unit cube consider the normals to the planes use the relationship between the their dot product: ab = Iallblcosqi consider angle between the normals of the (100) and (1 11) planes (1,0,0)-(1,1,1) = 1 = |1||3‘/-|cos¢ (p = cos4(1l3'/*) = 54.7" 20 4o 20 . 40 55 u: : xon ‘ln nter Vt 1 KOH In water Etch Rate of Si in KOH Depends on Crystallographic Plane .' Obtaining Variable Etch Depths Undercutting and Releasing Vertical access Horizontal access Convex Corners are Etched Rapidly EHT" 200 W L'B- 1E 10 Corner Compensation 1 m H E2 : uilk Etching CAD Tool - UIUC: ACES — handles CIF, GDSII, BMP & outputs to AVI — PC platform — Free download: http:/lgalaxy.ccsm.uiuc.edu/aces4' P+ Etch Stop .mmuaawn:mmmummmemmmfimmmmmmmmm L"uuuuI"_m--II"|_==IIII:=.Illl__=-II-I Eaaan":"fin"_nnnnuuulh___.:ul.==Efl E:nan5u“Ea=_amfl=fimum_fi__an ".mnuunfléauuflésu _____=..l.......|l ___=.III__ .uIIIEF. I Il===ull ___=-III===-Ivn_===ll_=:=II=.=-nn =_==lI:=_unK'===-II_===II_= — =___=-I___“m=-I=___=-I=_____-I E...- ________I:__-________!_______-._______ ...... l'l...-Illll:c.nll'|.=-nlIll-i. ll ...... Ill :--."'..-=." .2..."" ...... IllL-nlllll_==ll' __auuuuh__.fiufl_fi.aum m mmmmmmm =_=-II'~_==III==n-II K I===III _=-l.===-l._==-l- P % -__==-I. _=_-!_=_=-I_=_== m m -_______-I g____m_x_=____m_n__n____ “ _________n “a:"unguauflfiauu _ .mfimmml :-II _= -II_===II_== .l _===II:_=-I'_= =II___= -II._ ______=l__ _=.l______=l_=__=.! Emu ________!_______J_______SEE—i; 1 sum sum 9:33; 1o21 Boron Concentration [c 1013 "1"] 0 5 PM m, w“. 4 EMU mm mm numb/tau n022L¢ 37. f2?) ...
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