A Framework for Process-to-Module Modeling of a-Si/c-Si (HIT) Heterojunction Solar Cells to Investigate the Cell-to-Module Efficiency Gap

作者：Chavali Raghu Vamsi Krishna; Johlin Eric C; Gray Jeffery Lynn; Buonassisi Tonio; Alam Muhammad Ashraful

来源：IEEE Journal of Photovoltaics, 2016, 6(4): 875-887.

DOI：10.1109/JPHOTOV.2016.2557060

• Current-voltage characteristics
• heterojunctions (HJs)
• modeling and simulation
• process control
• silicon
• solar cells
• amorphous semiconductors

The cell-to-module efficiency gap observed in a-Si/cSi heterojunction solar cells is a key challenge to the broad adoption of this technology. To systematically address this issue, we describe an end-to-end modeling framework to explore the implications of process and device variations at the module level. First, a process model is developed to connect the a-Si deposition parameters to the material properties. Next, a physics-based device model is presented; the model uses the thermionic emission/diffusion theory to capture the essential features of photocurrent and diode injection current. Using the process and device models, the effects of process conditions on cell performance are explored. Finally, the performance of the module, as a function of device and process parameters, is explored to establish the cell-to-module efficiency gap. The insights developed through this process-to-module modeling framework will help close the cell-to-module efficiency gap of this commercially promising technology.

• 出版日期2016-7
• 单位MIT