A new thin film heterojunction structure and fabrication process: dual backcontact CdS/CdTe Photovoltaics

摘要

Three-dimensionally structured solar cells seek to improve upon the efficiency and costof planar devices. For the CdS/CdTe system, published 3D geometries have not yet achievedthese goals, not surprising given the much longer history of research in planar devices. Wepropose a new geometry and process that could accelerate progress. Specifically we: (1)model the performance of devices with dual back contacts that move the CdS layer behind theCdTe and eliminate the front contact; (2) describe processing via inexpensive, scalableelectrodeposition on microscale patterned insulating substrates; and (3) present theperformance of some early devices. The processes and test bed geometries are amenable toan array of deposition techniques for fabrication and measurements of three dimensionallystructured absorbers, contact materials and photovoltaic devices.