Aromatic Molecules Unlock Ultrastable Perovskite Quantum Dot Solar Cells, Retaining 93% Efficiency for 6,000 Hours

July 12, 2026

ACS Energy Letters USA

Overview

Researchers have achieved highly stable and efficient perovskite quantum dot (PQD) solar cells by precisely controlling their ripening process with aromatic molecules, significantly reducing surface defects. This breakthrough led to devices maintaining 93% of their initial efficiency after 6,000 hours of storage and approximately 80% after 288 hours of continuous operation, marking a critical advance towards commercializing solution-processable PQDs for next-generation photovoltaics.

In Depth

Background

Perovskite quantum dot solar cells are highly anticipated as next-generation photovoltaics due to their tunable bandgap, high absorption coefficient, and potential for low-cost manufacturing via solution processing. Various applications, including transparent solar cells, flexible solar cells, and even photodetectors, are being explored. However, carrier recombination stemming from quantum dot surface defects and degradation due to environmental factors have been primary challenges hindering their practical use. This study addresses these challenges with an innovative approach of ripening control using aromatic molecules, clearly outlining a pathway for the commercialization of PQD technology.

Key Findings

Researchers have successfully engineered highly efficient and remarkably stable perovskite quantum dot (PQD) solar cells by precisely controlling their ripening process using aromatic molecules. This innovative approach effectively mitigates surface defects, which have historically limited PQD device performance despite their excellent optoelectronic properties and solution processability. By introducing specific aromatic molecules during PQD synthesis, the team created passivation layers on the quantum dot surface. These layers deactivate defect sites and promote the formation of uniform, high-quality crystal structures, thereby suppressing non-radiative recombination and enhancing charge carrier lifetime and extraction efficiency.

The resultant PQD-based devices achieved exceptional performance metrics. Notably, those incorporating TEAA PDI quantum dots demonstrated unprecedented storage stability, retaining an astounding 93% of their initial power conversion efficiency (PCE) after 6,000 hours. Furthermore, the devices exhibited robust operational stability, maintaining approximately 80% efficiency after 288 hours of continuous operation—a significant leap forward in addressing the long-standing instability challenges of PQD technology.

This advance not only boosts the reliability of PQD technology but also paves a clear pathway towards its commercialization. The enhanced efficiency and stability will enable PQD solar cells to power applications previously challenging for photovoltaics, including wearable electronics, smart windows, and IoT devices. Future work will focus on optimizing the technology for large-area fabrication, cost reduction, and extensive validation under diverse environmental conditions, positioning this innovation to meet diverse clean energy needs and expand the frontiers of next-generation solar power.

Source: https://pubs.acs.org/doi/10.1021/acsenergylett.6c01202

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