The information you have is within the lines. Amorphous silicon pv cells exibit less voltage drop at high operating temps. They absorb more ambient light (surface texture with uni, seemingly) and have slightly different absorbtion/conversion characteristics as far as i remember.
Time to brush up On that part!
Amprphous pv is available with glass or polymer covers. Calculators, solar landscape
lights, small panels from inexpensive kits, etc have this thin film technology.
Less high temperature caused, derating of the module and higher pv operating voltage in general, was especially helpful when pv modules could not be operated much higher than battery voltage, usually 12v nominal and all wired in parallel.
Shunt controllers and early pwm had low voltage acceptance and wiring techniques or materials were sometimes lacking, on top of astronomically high price per watt, making every volt/watt count was the name of the game. Still is today, but power electronics...and inexpensive watts.
Monocrystalline cells maintain higher voltages/wattages vs high temp than poly, but its not a deal breaker there either. Possibly the panel will be expected to operate at high temps full time....then a critical detail could evolve.
Now a days, 3 to 6 or more of these 18 volt-ish panels cold be placed in series, 75v up to 600v with readily available controls. Voltage is available.
For practical purposes, the 'stick on' module does keep its volts/power up at high temps, is rugged and it does look nice when installed.