You can buy solar cells off aliexpress at ~$0.33 / watt (this is the lowest price atm). The most efficient cells are at 23-25% efficiency, but these are a bit more expensive (closer to $0.5).

Here's the first example I could find (https://www.aliexpress.com/item/10-Pcs-17-6-125-x-125MM-Mono...).

In the real world you cannot expect to need less than around 5 square meters for 1kW of peak power (using the most efficient panels), the standard "rule of the thumb" being 7 sq meters per 1 kW, some lower efficiency panels (not used anymore) will stretch that up to nearly 9 square meters per 1kW.

This puts the efficiency in a range between 1/9 and 1/5, i.e. between 11 and 20%.

So if this new panel has a 1/10-1/8 of the best above, it plainly means that you will need in your typical single home installation more space than your roof has.

Let's take a 6 kW installation, with best current panels it will be 30 square meters or however at the most 45, with these printed thingies more like 240-300 sqm or more.

And 2-3 years of expected life!

Maybe the principle is fine but it must be modified/bettered to raise the efficiency and to increase the durability.