The solar company backed by energy groups Total and Chevron as well as Japan-based imaging company Konica Minolta has raised more than $170m in its history.

Konarka, a US-based solar company part-founded by Nobel prize winner Alan Heeger and backed by energy groups Total  and Chevron as well as Japan-based imaging company Konica Minolta,, has filed for bankruptcy protection.

Howard Berke, executive chairman of Konarka, said: "Konarka has been unable to obtain additional financing, and given its current financial condition, it is unable to continue operations. This is a tragedy for Konarka’s shareholders and employees and for the development of alternative energy in the United…