Multiple Exciton Generation Solar Cells: Numerical Approach of Quantum Yield Extraction and its Limiting Efficiencies

TL;DR

This paper introduces a numerical method using Gaussian distribution functions to analyze quantum yield and efficiency limits in multiple exciton generation solar cells, addressing non-idealities and material imperfections.

Contribution

It presents a novel mathematical approach for quantifying quantum yield and efficiency limits in MEGSCs by incorporating Gaussian distributions to model carrier occupancy.

Findings

Quantitative analysis of nonradiative recombination effects

Determination of theoretical efficiency limits of MEGSCs

Assessment of material imperfections on quantum yield

Abstract

Multiple exciton generation solar cells exhibit a low power conversion efficiency owing to nonradiative recombination even if numerous electron and hole pairs are generated per incident photon. This paper elucidates the non-idealities of multiple exciton generation solar cells (MEGSCs) and alternative approaches for realizing photovoltaic (PV) devices similar to MEGSCs. First, we present mathematical approaches for determining the quantum yield (QY) to discuss the non-idealities of MEGSCs by adjusting the delta function. In particular, we employ the Gaussian distribution function to present the occupancy status of carriers at each energy state by Dirac delta function. By adjusting the Gaussian distribution function for each energy state, we obtain the ideal and non-ideal QYs. Through this approach, we discuss the material imperfections of MEGSCs by analyzing the mathematically obtained QYs. By calculating the ratio between the radiative and nonradiative recombination, we can discuss the status of radiative recombination calculate Furthermore, we apply this approach into the detailed balance limit of MEGSC to investigate the practical limit of MEGSC.