article · IEEE Journal of Photovoltaics
This research examines how nitrogen-doped carbon quantum dots enhance the performance of dye-sensitised solar cells, particularly when operating under diffused and low-light environments. Adding these quantum dots into both the commercial dye and the mesoporous titanium dioxide layer provides a dual beneficial role. Under standard one-sun illumination, the modified cells achieve a maximum power conversion efficiency that is two percent higher than untreated baseline cells. To measure performance under non-ideal lighting, the study establishes two evaluation metrics: the diffused-light coefficient and the low-light intensity coefficient. Testing yielded a diffused-light coefficient of 1.55 and a low-light intensity coefficient of 2. These metrics show that the quantum-dot integration significantly boosts power conversion efficiency in shaded or dim conditions, offering useful pathways for tailoring solar cells to ambient or indoor lighting.
Conventional solar panels work best in direct sunlight, often failing to generate practical power indoors or on overcast days. By demonstrating that carbon quantum dots can significantly enhance light harvesting under diffuse and dim lighting, this work aids the development of photovoltaic devices capable of operating effectively inside buildings or under non-ideal outdoor conditions.
The findings could enable more efficient solar cells for indoor or low-light applications, which may be useful to manufacturers of ambient-light harvesters or specialised electronics. Based strictly on the laboratory metrics and performance gains reported in the abstract, this represents early-stage experimental research that requires further development before reaching commercial deployment.
AI-generated from the published abstract. Always read the original work before citing.
This study investigates the double role of N-doped carbon quantum dots (N-CQDs) in dye-sensitized solar cells (DSSCs) that operate under diffused- and low-light intensity conditions. We demonstrate that the incorporation of N-CQDs leads to a substantial improvement in the performance of DSSCs. Under standard one-sun illumination, the maximum power conversion efficiency (PCE) achieved with N-CQDs is 2% higher than that of the bare cell. Moreover, we introduce two new metrics, the diffused-light coefficient and the low-light intensity coefficient, to evaluate the performance of DSSCs under nonideal illumination conditions. The diffused-light coefficient is recorded at 1.55, which indicates a notable enhancement in diffused-light PCE with N-CQDs. In contrast, the low-light intensity coefficient shows a significant enhancement factor 2, which highlights the superior performance of N-CQD-based DSSCs under low-light conditions. Our findings demonstrate that N-CQDs play a dual role in DSSCs, by being added to both the commercial dye and the mesoporous TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> layer. These results provide valuable insights to develop and optimize DSSCs, especially for applications in indoor or low-light environments. The proposed metrics, the diffused light coefficient, and the low-light intensity coefficient, offer a meaningful assessment of the device's performance under nonideal illumination conditions.
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DOI: 10.1109/jphotov.2023.3336474
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