Silicon solar cells with homo/heterojunction hybrid structures

• Main Authors: Chih-Wei Chang, 張志維
• Other Authors: Kuo-Feng Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/97054749510679951137

碩士 === 國立高雄應用科技大學 === 光電與通訊工程研究所 === 101 === In this paper, HHHS (Homo-heterojunction hybrid structure) solar cells have better efficiencies than Sanyo HIT (Heterojunction with intrinsic thin layer) solar cells by AFORS-HET numerical simulation software. The hybrid heterogeneous structure is based on single-crystal silicon with two lateral depositions of amorphous silicon. The structure not only avoids patent issues of Sanyo HIT but also dispenses with the troubled production of amorphous silicon intrinsic layer with high purity. The conversion efficiency of 19.48% of HHHS solar cells is higher than that of 19.44% of HIT solar cells. There are two main reasons for HHHS’s outperformance to HIT. First, HHHS operates a better internal quantum efficiency in short wavelength interval than HIT does. Second, the tunneling barrier of HHHS is thinner than that of HIT; therefore, it is easier to reach the P electrode of HHHS compared to HIT. In view of the slope of the conversion efficiency to the thickness of the first middle layer, the slope of HHHS is smaller than HIT, so HHHS has a higher process tolerance during fabricating critical layers. Consequently, HHHS provides a better choice for silicon heterojunction solar cells than HIT which is well-known for a long time.