opt101 (photodiode) adjust voltage output
You need to add external resistance, for example between 4 and 5 pins, with some shunt capacitance. There is a table in the datasheet.

About 10M in parallel with 5pF, which will give you a gain of 11x what you have now, so about 4.4V rather than 0.4V.
It's not advisable to use a breadboard because of stray capacitance, but if you try it, you might want to increase the shunt capacitance to about 10pF or a bit more to ensure stability. The response will be more sluggish as a result.