研究目的
To design and synthesize novel cost-effective hole transporting materials (HTMs) for perovskite solar cells (PSCs) that can replace the expensive Spiro-OMeTAD, achieving comparable device performance and superior atmospheric stability.
研究成果
The synthesized D-A-D type HTMs (TTz-1 and TPDCN) demonstrated good thermal stability, high hole mobility, and appropriate energy level alignment with perovskite, leading to PCEs comparable to Spiro-OMeTAD. TTz-1-based devices showed superior performance and atmospheric stability, suggesting these materials as promising candidates for cost-effective and efficient PSCs.
研究不足
The study acknowledges the light soaking effect observed in devices with TTz-1 and TPDCN, which may affect the precise evaluation of device performance. The exact mechanism behind this phenomenon is not fully understood.
1:Experimental Design and Method Selection
The study involved the synthesis of two D-A-D type HTMs (TTz-1 and TPDCN) using a Pd-free synthetic route and their integration into planar PSC devices. The photophysical, electrochemical, and thermal properties of the HTMs were characterized, and their performance in PSCs was evaluated.
2:Sample Selection and Data Sources
The HTMs were synthesized from commercially available chemicals. Perovskite solar cells were fabricated using these HTMs, and their performance was compared with devices using Spiro-OMeTAD.
3:List of Experimental Equipment and Materials
Equipment included Bruker Avance 500 NMR, WATERS-Q-TOF Premier-ESI-MS, Agilent technologies Cary 7000 spectrophotometer, Horiba Jobin Yvon Fluorolog-3 spectrofluorometer, SDTQ600 for TGA, and Keithley 2400 source meter for photovoltaic device characterization. Materials included aniline, copper iodide, Spiro-OMeTAD, titanium isopropoxide, and others as listed in the Materials section.
4:Experimental Procedures and Operational Workflow
The synthesis of HTMs involved multi-step chemical reactions followed by purification. PSC devices were fabricated by spin-coating layers of compact TiO2, perovskite, HTM, and gold electrodes. Characterization included UV-Vis absorption, emission spectra, cyclic voltammetry, TGA, AFM, and photovoltaic performance testing.
5:Data Analysis Methods
Data analysis included calculating HOMO/LUMO levels from cyclic voltammetry, optical band gaps from absorption spectra, hole mobility using the SCLC method, and photovoltaic parameters from J-V curves.
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Bruker Avance 500
500 MHz
Bruker
NMR spectroscopy
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Agilent technologies Cary 7000 spectrophotometer
Cary 7000
Agilent
UV-Vis absorption spectra measurement
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Keithley 2400 source meter
2400
Keithley
Current-voltage characteristics measurement
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WATERS-Q-TOF Premier-ESI-MS
Waters
High-resolution mass spectrometry
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Horiba Jobin Yvon Fluorolog-3 spectrofluorometer
Fluorolog-3
Horiba Jobin Yvon
Fluorescence spectra measurement
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SDTQ600
Thermogravimetric analysis
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