研究目的
Investigating the role of morphology of surfactant-free nanoparticles in organic photovoltaics to achieve thermally stable NP-OPV devices with higher photocurrents and efficiencies.
研究成果
The study concludes that precipitated NPs provide a pathway to thermally stable NP-OPV devices with higher photocurrents and efficiencies, approaching those of optimal BHJ OPV devices. The molecularly blended morphology observed in precipitated NPs may serve as a pathway to NP-OPV devices with both high thermal stability and efficiencies approaching those of BHJ OPV devices.
研究不足
The study highlights the inherent instability of precipitated inks and the necessity for multiple deposition steps to achieve an active layer devoid of pinholes and thick enough for consistent device performance.
1：Experimental Design and Method Selection:
The study utilized the precipitation method for the formation of nanoparticle suspensions, optimizing the ink as a function of the nanoparticulate weight loading in the ethanol matrix.
2：Sample Selection and Data Sources:
P3HT and PC61BM were used as active materials, dissolved in chloroform, and then added to ethanol to produce nanoparticle suspensions.
3：List of Experimental Equipment and Materials:
Instruments included dynamic light scattering (DLS), SEM, TEM, AFM, GIXRD, UV–Vis spectrophotometer, PL spectrophotometer, and OPV device characterization methods.
4：Experimental Procedures and Operational Workflow:
Nanoparticle suspensions were prepared and characterized for stability, morphology, and performance in OPV devices.
5：Data Analysis Methods:
Performance and active layer morphology were assessed using various techniques including GIXRD, AFM, TEM, SEM, UV–Vis spectroscopy, PL spectroscopy, and OPV device characterization methods.
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Zeiss Sigma VP
Sigma VP
Zeiss
Perform SEM measurements.
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JEOL 1200EX TEM
1200EX
JEOL
Record TEM images of the NPs.
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Keithley 2400 source meter
2400
Keithley
Record current–voltage (I–V) data.
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Zetasizer Nano-ZS
Nano-ZS
Malvern Instruments
Measure the distribution of particle sizes in the aqueous dispersions.
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Varian Cary 6000i
Cary 6000i
Varian
Study the absorption of the nanoparticulate dispersions and ?lms.
Cary 60 UV-Vis Spectrophotometer
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Cary Eclipse
Eclipse
Varian
Conduct PL measurements.
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Cypher
Cypher
Asylum Research
Perform AFM in alternating-current (AC) mode.
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Phillips X’PertPRO MPD XRD
X’PertPRO MPD
Phillips
Perform grazing-incidence x-ray diffraction analysis.
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Newport Class A solar simulator
Class A
Newport
Conduct current–voltage (I–V) measurements.
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Oriel Cornerstone 130 monochromator
Cornerstone 130
Oriel
Record EQE spectra.
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