Optimal quantum dot size for photovoltaics with fusion

TL;DR

This paper explores how optimizing quantum dot size in lead sulfide-based solar cells can significantly enhance light fusion efficiency, potentially surpassing current performance records and maintaining compatibility with silicon cells.

Contribution

It introduces a Monte Carlo simulation approach to identify the optimal quantum dot size for efficient light fusion in photovoltaic devices.

Findings

Quantum dot size critically affects fusion efficiency.

Predicted current density exceeds existing records.

Compatibility with silicon solar cells is maintained.

Abstract

Light fusion increases the efficiency of solar cells by converting photons with lower energy than the bandgap into higher energy photons. The solar cell converts the product photons to current. We use Monte Carlo simulation to predict that lead sulfide (PbS) quantum dot sensitizers will enable fusion with a figure of merit on the mA cm$^{-2}$ scale, exceeding current records, while enabling silicon cell compatibility. Performance is highly sensitive to quantum dot size, on the order of mA cm$^{-2}$ nm$^{-1}$.