研究目的
Developing strategies for compensating for the losses in light harvesting to achieve a further enhancement in device efficiencies of perovskite solar cells (PSCs).
研究成果
The application of CQD@PMMA coating on PSC devices showed an improved photocurrent and fill factor, resulting in an overall performance increase. The method is simple and straightforward to apply and can afford further fine-tuning and/or modification to fabricate functional thin films with the desired properties and morphology.
研究不足
The study does not address the long-term stability of the CQD@PMMA coating under operational conditions. Additionally, the effect of varying environmental conditions on the performance of the coated PSCs was not investigated.
1：Experimental Design and Method Selection:
The down-conversion effect of carbon quantum dots (CQDs) was employed to convert the UV fraction of the incident light into visible light. Thin films of poly(methyl methacrylate) with embedded carbon quantum dots (CQD@PMMA) were deposited on the illumination side of PSCs.
2：Sample Selection and Data Sources:
High-purity materials were purchased from Alfa Aesar or Sigma-Aldrich and used as received. The FTO-coated glass substrates (~7 ohm/sq) were obtained from OPV-tech (Yingkou City, China). The organic precursors for synthesis of perovskite thin films were obtained from the GreatCell Solar.
3：List of Experimental Equipment and Materials:
Transmission electron microscope (TEM) (JEM 2010F, JEOL Ltd., Tokyo, Japan), Cary Eclipse Fluorescence Spectrophotometer (Agilent Technologies Inc., Santa Clara, CA, USA), Lambda 1050 spectrophotometer (Perkin Elmer Inc., Waltham, MA, USA), Keithley 2400 sourcemeter (Tektronix Inc., Beaverrton, OR, USA), AAA class ORIEL Sol3A solar simulator (Newport Corporation, Irvine, CA, USA).
4：Experimental Procedures and Operational Workflow:
Phosphorus-doped CQDs were prepared and mixed with PMMA in chlorobenzene. The resulting mixture was sonicated and stirred. The CQD@PMMA solution was spin-coated on the illumination side of prefabricated PSCs. The performance of the devices was measured before and after application of the CQD@PMMA coating.
5：Data Analysis Methods:
The J–V characteristics of the devices were measured under an AAA class ORIEL Sol3A solar simulator equipped with an Air Mass (AM) 1.5 filter at 100 mW/cm2. The light intensity was calibrated by a Si reference cell from Newport.
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