Yes, it is possible to use the sun as a gravitational lens and to achieve better telescopic viewing. As you know space is curved by mass and so light is deflected by mass, it is possible to focus light using gravitational lenses and thus achieving greater telescopic viewing.
However, the sun does have corona fluctuations around it. So, to better exploit the gravitational lensing effect of the Sun, one should try to focus a little bit further away from the sun.
Actually, it was already being planned for a space mission to exploit the sun's gravitational lensing effect to communicate interstellarly. The mission is called FOCAL (For "Fast Outgoing Cyclopean Astronomical Lens").
For more further information, search for either "Dr.Claudio Maccone" or "FOCAL Space Mission"
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