Institute of Modern Optical Technologies & Collaborative Innovation Center of Suzhou Nano Science and Technology, Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China.
Nanoscale Res Lett. 2014 Feb 12;9(1):73. doi: 10.1186/1556-276X-9-73.
Tandem solar cells consisting of amorphous and microcrystalline silicon junctions with the top junction nanopatterned as a two-dimensional photonic crystal are studied. Broadband light trapping, detailed electron/hole transport, and photocurrent matching modulation are considered. It is found that the absorptances of both junctions can be significantly increased by properly engineering the duty cycles and pitches of the photonic crystal; however, the photocurrent enhancement is always unevenly distributed in the junctions, leading to a relatively high photocurrent mismatch. Further considering an optimized intermediate layer and device resistances, the optimally matched photocurrent approximately 12.74 mA/cm2 is achieved with a light-conversion efficiency predicted to be 12.67%, exhibiting an enhancement of over 27.72% compared to conventional planar configuration.
我们研究了由非晶硅和微晶硅结组成的串联太阳能电池，其顶部结被纳米图案化为二维光子晶体。我们考虑了宽带光捕获、详细的电子/空穴输运和光电流匹配调制。研究发现，通过适当设计光子晶体的占空比和周期，可以显著提高两个结的吸收率；然而，光电流增强在结中总是不均匀分布，导致相对较高的光电流失配。进一步考虑优化的中间层和器件电阻，实现了最佳匹配的光电流约为 12.74 mA/cm2，预测的光-电转换效率为 12.67%，与传统的平面结构相比，增强了超过 27.72%。
