研究目的
Investigating the carrier ultrafast dynamics and interfacial transport of bis(4-methylthio)phenyl)amine-based hole transport materials for highly-efficient perovskite solar cells.
研究成果
The study demonstrates that MT-based small-molecule HTLs significantly enhance the performance of perovskite solar cells by facilitating quicker trap filling and hole extraction compared to PEDOT:PSS. This is attributed to faster carrier dynamics and reduced trap state density at the interface between MT-based HTLs and MAPbI3. The findings provide a promising approach for designing new HTLs for highly-efficient solar cells.
研究不足
The study is limited by the specific types of HTLs and perovskite materials used. The deep carrier defect interaction and the broader applicability of the findings to other perovskite solar cell architectures require further investigation.
1：Experimental Design and Method Selection:
The study involved the synthesis of MT-based small-molecule HTLs and their application in planar inverted perovskite solar cells. Femtosecond time-resolved transient absorption spectroscopy (fs-TA) was used to study carrier dynamics.
2：Sample Selection and Data Sources:
Perovskite solar cells with different HTLs (FMT, DBFMT, DBTMT, and PEDOT:PSS) were fabricated. The photovoltaic properties were extracted from 12 identical cells.
3：List of Experimental Equipment and Materials:
Instruments included a Ti:sapphire femtosecond regenerative amplifier, a second harmonic generator (SHG), a high-speed spectrometer (HELIOS, Ultrafast Systems), Hitachi U-3010 UV-vis spectrophotometer, SUPRA8010 scanning electron microscope, Keithley Model 2400 multisource meter, and a solar simulator (500 W Xe lamp).
4：Experimental Procedures and Operational Workflow:
The devices were fabricated by spin-coating HTL materials on ITO/glass substrates, followed by the deposition of perovskite layers, C60/bathocuproine (BCP) double layers, and Ag electrodes. The carrier dynamics were monitored via fs-TA techniques.
5：Data Analysis Methods:
The data were analyzed using exponential fitting of the photo-bleaching decay to determine the critical time components of carrier injection from perovskites to HTLs.
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high-speed spectrometer
HELIOS
Ultrafast Systems
Detection of the probe beam in femtosecond pump-probe transient absorption measurements.
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UV-vis spectrophotometer
U-3010
Hitachi
Recording of transmittance spectra.
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multisource meter
2400
Keithley
Measurement of photovoltaic characteristics under illumination.
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Ti:sapphire femtosecond regenerative amplifier
coherence
Generation of femtosecond laser pulses for pump-probe transient absorption measurements.
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second harmonic generator
SHG
Generation of pump pulse with a wavelength of 400 nm for excitation of samples.
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scanning electron microscope
SUPRA8010
Investigation of structural and morphological characteristics of MAPbI3 films on different HTLs.
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solar simulator
ORIEL Solar 3A94023A
Employment as the light source for photovoltaic measurements.
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electrochemical workstation
IM6ex
Zahner
Recording of electrochemical impedance spectroscopy (EIS) measurements.
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