tag:blogger.com,1999:blog-401164737462963207.post7427218875927752038..comments2024-03-28T00:14:10.834-07:00Comments on Ben Krasnow: Making patterned mirrors and ITO glass with a thermal evaporator Ben Krasnowhttp://www.blogger.com/profile/04234629396863486242noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-401164737462963207.post-74442180042765893722013-10-12T11:51:36.646-07:002013-10-12T11:51:36.646-07:00David, it seems that your contact info is not visi...David, it seems that your contact info is not visible via G+. I can't even send a message? Strange. Feel free to email me ben.krasnow@gmail.com.Ben Krasnowhttps://www.blogger.com/profile/04234629396863486242noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-44693510006740202672013-10-07T18:56:53.294-07:002013-10-07T18:56:53.294-07:00Shoot me an email on Google+. I have some single m...Shoot me an email on Google+. I have some single molecule semiconductors that can be drop cast, or evaporated, and at least a small vial of one of the polythiophenes. Some single molecules I have make good OLEDs, others make good transistors. I might have some MEH-PPV that you can make OLEDs or OLECs from. I'll dig around. Chemists never get rid of anything.Robin St. Johnhttps://www.blogger.com/profile/18079748114787155061noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-21755991348287042302013-10-07T15:03:25.152-07:002013-10-07T15:03:25.152-07:00David, I really appreciate the advice. I've gi...David, I really appreciate the advice. I've given up on the idea of evaporating ITO, and I'm surprised that places like Lesker sell ITO pellets intended for evaporation. I've already started on the sputter gun, but I'm hoping to use DC since I don't have a high power RF power supply yet. I don't have a ResearchGate account, but I'd be interested in hearing about your research and using your organic semiconductors. Talk to you later -BenBen Krasnowhttps://www.blogger.com/profile/04234629396863486242noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-17752043092045449252013-10-07T09:39:15.569-07:002013-10-07T09:39:15.569-07:00OK, Ben, this is what I learned about evaporating ...OK, Ben, this is what I learned about evaporating ITO: one of the biggest issues with evaporation is that complex targets do not maintain stoichiometry. At the high temperatures involved, often phase segregation occurs and you are stuck with the relative evaporation rates of the different elements/materials. Also, oxygen vacancies are the major “dopant” in ITO generating charge carriers, so controlling the oxygen stoichiometry is critical to getting transparent coatings that are still conductive. I'm not sure evaporation will work unless someone has all the details dialed in. Time to build an RF sputtering chamber...<br /><br />Robin St. Johnhttps://www.blogger.com/profile/18079748114787155061noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-20374510773142204382013-10-07T06:39:09.340-07:002013-10-07T06:39:09.340-07:00ITO is not usually evaporated- I'll ask some c...ITO is not usually evaporated- I'll ask some coatings guys I know about what might be happening. I saw some recommendations on your YouTube feed. Annealing in oxygen would probably make things no better; good ITO heated in air loses conductivity. There is a critical amount of 'oxygen vacancies' you need. Nitrogen might be better, but I am dubious that this is the problem.<br /><br />I have some organic semiconductors I can send you if you want to make some films and experiment. A good first experiment, before you try TFTs or OLEDs, is to make a film and watch its conductivity change in response to light. Do you have a ResearchGate profile? I have about a dozen publications in the area of organic semiconductors and devices, if you want to see them.Robin St. Johnhttps://www.blogger.com/profile/18079748114787155061noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-30157117574557897212013-08-16T21:00:43.820-07:002013-08-16T21:00:43.820-07:00Be aware that you will slowly apply a thin film to...Be aware that you will slowly apply a thin film to your vacuum bell jar! Perhaps surrounding the work area with plate glass or a mason jar (propped up for vacuum) you can avoid altering your bell jar.<br />TechGuynoreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-1458685680693459342013-08-07T11:41:41.015-07:002013-08-07T11:41:41.015-07:00maybe you could apply an external magnetic field t...maybe you could apply an external magnetic field to the MOT laminations, thereby decreasing its inductance and limiting the current output.exekutivehttps://www.blogger.com/profile/12205332141561526433noreply@blogger.comtag:blogger.com,1999:blog-401164737462963207.post-60238008161322491752013-08-06T21:43:02.059-07:002013-08-06T21:43:02.059-07:00I love the elegance of your solutions, Ben, and I ...I love the elegance of your solutions, Ben, and I live down at 1e-11! Any plans for a quartz microbalance?jarvisjdhttps://www.blogger.com/profile/07492352982602656870noreply@blogger.com