Yang Fan, Zhang Ye, Hao Yuying, Cui Yanxia, Wang Wenyan, Ji Ting, Shi Fang, Wei Bin
Appl Opt. 2015 Dec 1;54(34):10232-9. doi: 10.1364/AO.54.010232.
We demonstrate a visible transparent organic photovoltaic (OPV) with improved transmission and absorption based on tandem photonic crystals (TPCs) for greenhouse applications. The proposed device has an average transmittance of 40.3% in the visible range of 400-700 nm and a high quality transparency spectrum for plant growth with a crop growth factor of 41.9%, considering the weight of the AM 1.5G solar spectrum. Compared with the corresponding transparent OPV without photonic crystals, an enhancement of 20.7% in the average transmittance and of 24.5% in the crop growth factor are achieved. Detailed investigations reveal that the improved transmittance is attributed to the excitation of the optical Tamm state and the light interference effect in TPC. Concomitantly, the total absorption efficiency in the active layer of the designed TPC based transparent OPV reaches 51.5%, being 1.78% higher than that of the transparent OPV without PC and 76% of that of the opaque counterpart. The improved absorption originates from the Bragg forbidden reflectance of TPC. Overall, our proposal achieves the optimized utilization of sunlight by light manipulation of TPC.
我们展示了一种基于串联光子晶体（TPC）的、具有改善的透射率和吸收率的可见光透明有机光伏（OPV），用于温室应用。所提出的器件在400 - 700 nm可见光范围内的平均透射率为40.3%，考虑到AM 1.5G太阳光谱的权重，具有高质量的植物生长透明光谱，作物生长因子为41.9%。与没有光子晶体的相应透明OPV相比，平均透射率提高了20.7%，作物生长因子提高了24.5%。详细研究表明，透射率的提高归因于光学Tamm态的激发和TPC中的光干涉效应。同时，基于TPC的设计透明OPV有源层的总吸收效率达到51.5%，比没有光子晶体的透明OPV高1.78%，是不透明对应物的76%。吸收的改善源于TPC的布拉格禁戒反射率。总体而言，我们的方案通过TPC的光操纵实现了太阳光的优化利用。
