The cost aspects of Samsung/Toshiba's vertical channel 3D NAND approaches were published last month in the IEEE Transactions on Semiconductor Manufacturing (see the following link for free download: http://bit.ly/1imVpBb)
A description of these cost challenges along with other technical issues can be found here at 3DIncites: http://bit.ly/17c1DPw
The main points are:
(1) If those vertical holes and slits are beyond a few tenths of a degree from the normal (in other words, if they are slightly slanted), the whole concept is no longer economically viable and can be undercut in cost by other approaches.
(2) The string currents rapidly decline as densities/capacities increase to the point where the question arises whether such approaches are indeed foundations for several generations to come or are simply one-offs.
Full disclosure - Both the IEEE paper and the 3DIncites piece were written by me.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.