It should be noted that this is a technology for producing a semiconductor material with very high performance, but also with very high cost, a cost that is impossible to reduce, because both indium and selenium are among the least abundant elements on Earth (both having an abundance similar to silver, but being much more difficult to mine than silver, because they are very dispersed).
This material will never replace cheap materials, like silicon or silicon carbide, or even gallium nitride, in the bulk of semiconductor devices, e.g. in CPUs and memories, or in power semiconductor devices.
It will be reserved for a few high-speed devices, in special instruments that need high-speed signal processing or in radars or communication devices used in high-frequency bands (obviously these include military applications).
Selenium gets washed down residential shower drains every day in the form of dandruff shampoo. Surely if we can afford that, there's enough to go around for the semiconductor industry?
According to TFA, they have succeed to produce 2-inch wafers of indium selenide with a small enough density of defects, which nobody did previously.
The first roadblock on the use of new semiconductor materials is that in the beginning nobody succeeds to make crystals that are both big enough and free enough of defects. For size, usually achieving to make 2-inch wafers is the threshold for enabling commercial applications.
The second problem is finding metallization systems that can achieve ohmic contacts and rectifying contacts on the semiconductor crystal and the third is finding impurities that allow to modify the polarity and the concentration of the charge carriers in wide enough ranges.
These 2 problems are particularly difficult for wide-bandgap semiconductors, like gallium nitride, but they are unlikely to be difficult for indium selenide, which should behave similarly to zinc selenide or indium phosphide, for which there is much more experience.
This material will never replace cheap materials, like silicon or silicon carbide, or even gallium nitride, in the bulk of semiconductor devices, e.g. in CPUs and memories, or in power semiconductor devices.
It will be reserved for a few high-speed devices, in special instruments that need high-speed signal processing or in radars or communication devices used in high-frequency bands (obviously these include military applications).