Large Active Area phototransistors? And can solar cells be a replacement
For a somewhat larger photodetector, use a 10 mm, through-hole, diffused package (not water-clear), green LED as your sensor.
Something like this one:

The diffusion will provide better sensing when the laser is off-axis to the LED, compared to a water-clear one.
The reason to use a green LED is, LEDs, when used as photodetectors, are most sensitive to their predominant emission wavelength, or actually slightly shorter wavelengths.
See this link for LED as a light sensor, which touches upon the above.