Is solar energy technology widely accepted today?

Depends on what you mean by "solar energy technology" and "widely".

There are certainly a large number of man made solar power converters in current use. That suggests that it is "widely" in use.

But, compared to fossil energy the amount of energy created using "solar technology" is fairly minor.

But what do you mean by "solar energy technology"? A hydroelectric dam is a "solar energy technology". Dams are widely used and in some places contribute the majority of the electricty.