MULTILAYER THIN-FILM BACK CONTACT SYSTEM FOR FLEXIBLE PHOTOVOLTAIC DEVICES ON POLYMER SUBSTRATES

摘要

A photovoltaic element includes a polymer substrate having opposing device and back sides, and having a coefficient of thermal expansion of at least 4 parts per million per degree Celsius but not exceeding 12 parts per million per degree Celsius. A metal structure is disposed on the device side of the polymer substrate, and the metal structure includes (a) a transition-metal-based layer disposed on the polymer substrate, (b) an aluminum-based barrier layer disposed on the transition-metal-based layer, and (c) a molybdenum-based cap layer disposed on the aluminum-based barrier layer. A CIGS photovoltaic structure is disposed on the molybdenum-based cap layer.

主权项

1. A photovoltaic element, comprising:
a polymer substrate having opposing device and back sides, and having a coefficient of thermal expansion of at least 4 parts per million per degree Celsius but not exceeding 12 parts per million per degree Celsius; a metal structure disposed on the device side of the polymer substrate, the metal structure comprising:
a transition-metal-based layer disposed on the polymer substrate,an aluminum-based barrier layer disposed on the transition-metal-based layer, anda molybdenum-based cap layer disposed on the aluminum-based barrier layer; and a CIGS photovoltaic structure disposed on the molybdenum-based cap layer.