College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, China.
Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
Nanoscale Res Lett. 2016 Dec;11(1):233. doi: 10.1186/s11671-016-1447-0. Epub 2016 Apr 29.
We report an approach for substantially enhancing the light-trapping and photoconversion efficiency of hydrogenated amorphous silicon (a-Si:H) single-nanowire solar cells (SNSCs) by engineering the cross section of the nanowire from circular into a front-opening crescent shape. The proposed SNSCs show a broadband and highly tunable optical absorption compared to the conventional circular counterparts under both transverse electric and transverse magnetic incidences, enabling an enhancement ratio of over 40 % in both the photocurrent density and the photoconversion efficiency in a-Si:H SNSCs with a diameter of 200 nm. We further show that the superior performance can be well maintained under a wide range of incident angle and is robust to the blunt crescent edges.
我们提出了一种方法，通过将纳米线的横截面从圆形改为前端开口的月牙形，显著提高氢化非晶硅(a-Si:H) 单纳米线太阳能电池(SNSCs)的光捕获和光电转换效率。与传统的圆形相比，在横向电场和横向磁场入射下，所提出的 SNSCs 表现出宽带和高度可调的光吸收，使得直径为 200nm 的 a-Si:H SNSCs 的光电流密度和光电转换效率提高了 40%以上。我们还进一步表明，在宽入射角范围内可以很好地保持优异的性能，并且对钝月牙形边缘具有鲁棒性。
