| Summary: | 博士 === 國立成功大學 === 微電子工程研究所 === 104 === In the dissertation we approached the higher efficiency and reliable thin film tandem silicon solar cell with amorphous intrinsic layer tuning process.
For silicon thin-film solar cell, it is well known that one of the most important methods for preparing amorphous silicon doped with hydrogen (a-Si:H) with good stability against light soaking degradation is by properly tuning H2 dilution ratio in the intrinsic i-layer. However, it is hard to improve the longevity of Gen. 5 silicon thin-film tandem module by manipulating the H2 ratio within one i-layer alone because hydrogen treatment could easily compromise the front P-layer by PECVD. To solve this problem, we propose the “graded i-layer” method which incorporates multiple i-layers with different of hydrogen dilution ratios in place of the original single i-layer . By this method, the solar cell could provide higher initial power and the degradation ratio of the module could be reduced by approximately 2% comparing to the module with single i-layer. However, it has been observed that increasing hydrogen dilution has the undesirable effect of slowing down the deposition rate of the intrinsic layer, which reduce the efficiency of production. To counter this problem, we have designed a systematic approach to enhance the utilization rate of the feedstock gas, Silane. By our method, consumption of feedstock gas can be reduced by more than 40% and deposition rate of the intrinsic layer can be increased by 30% compared to the method of only increasing the hydrogen dilution without sacrificing module performance and stability.
For see through module, we found adding hardener into the conventional see-through tandem modules, that the efficiency degraded only by 6.0% for the see-through tandem modules with hardener, after 6 IEC cycles.
|
|---|
