Energy Conversion Devices was an American photovoltaics manufacturer of thin-film solar cells made of amorphous silicon used in flexible laminates and in building-integrated photovoltaics. The company was also a manufacturer of rechargeable batteries and other renewable energy related products. ECD was headquartered in Rochester Hills, Michigan.On February 14, 2012, Energy Conversion Devices, Inc. and its subsidiaries, United Solar Ovonic LLC and Solar Integrated Technologies, Inc.