Theoretical Model for Observation of the Conversion Efficiency into Quantum Dot Solar Cells

Abstract

In this work, a theoretical model for investigating the induced photocurrent and the corresponding power conversion efficiency is established. The quantum dot solar cells (QDSCs) model is used to determine the dependence of these figures of merits on its various parameters, such as optical generation lifetime, recombination lifetime, quantum dot size, surface density of quantum dots, effective density state into QDs, and number of QD layers. The spectral response for the power conversion efficiency is theoretically calculated. The obtained results ensure that up to 78% conversion efficiency is obtained due to the intrinsic region in the p-n junction being equipped with QD layers. Additionally, the results ensure that a wide spectrum of efficiency is obtained that is not only concentrated near 200 nm, as considered before, but also extended to longer wavelengths up to 3 μm. As a result, the QDSCs will respond to visible light, yielding a higher performance. Finally, the method overcomes the narrow-band response problem reported in the literature.