Improvements in stability of a-silicon solar cells through the use of bandgap grading

The authors examine the causes of instability in a-Si:H solar cells, and use a graded bandgap design, combined with high temperature deposition of a-Si:H to achieve both high performance and higher stability. They show that in order to achieve good devices at high temperatures, the design of appropriate buffer layers between p and i, and the deposition of the p layer are both important. They also show that interfaces play a major role in degradation.<>