TRANSLUCENT SUPPORT FOR A SEMICONDUCTIVE THIN FILM STRUCTURE, AND METHOD FOR PRODUCING AND USING THE TRANSLUCENT SUPPORT

摘要

Special light-trapping structures for increasing absorption are required for light-absorbing semiconductor thin films. Flat light-trapping structures only have good electric properties, and rough light-trapping structures only have good optical properties. The support (01) according to the invention has a light-trapping structure (02) which is smooth ("SMART" (SMooth Anti-Reflective Three-dimensional) texture). Additionally, the structured three-dimensional layer (09) is designed with a homogenous and periodic nanostructure (07) and is filled and covered at least with a first anti-reflective layer (10). In this manner, the height of the nanostructure (07) of the structured layer (09) is reduced by at least 30%. The surface angles of the light-trapping structure (02) relative to the superstrate (03) are not greater than 60°. The light-trapping structure (02) of the support (01) according to the invention has both very good optical properties as well as very good electric properties. On the basis of the selected materials, a temperature stability of the support (01) is provided for a liquid-phase crystallization. In a simple and large-scale production method, a nanostructure (07) produced using a nanoimprint process is first smoothed with the anti-reflective layer (10) by means of a spin coating method. In a preferred use, the subsequent thin film structure (14) can be processed by means of a liquid-phase crystallization process.