Optimizing the Positions of Quantum Dot Layers for Light Absorption Enhancement in Quantum Dot Solar Cells with Light Trapping

8th World Conference on Photovoltaic Energy Conversion; 419-422
We have investigated the effect of light trapping on the photoabsorption in quantum dot (QD) solar cells. Numerical simulations show that optimizing the positions of quantum dot layers can lead to an absorption enhancement using Fabry-Perot (FP) resonance and guided diffracted modes. Further, we experimentally demonstrate that positioning the InAs/GaAs quantum dot layers at the intensity peaks of FP resonance results in an increase of EQE and hence photocurrent. This effect can be used to improve the performance of QD solar cells and also photodetectors.