研究目的
To enhance photoresponse of common-used perovskite materials in the near-infrared (NIR) region by integrating a fused-ring electron acceptor (F8IC) with a narrow-bandgap polymer donor (PTB7-Th) to construct organic bulk heterojunction (OBHJ) and then integrating this OBHJ with perovskite solar cells.
研究成果
The integrated perovskite/OBHJ solar cells exhibit strong photoresponse approaching 1000 nm and an ultrahigh short-circuit current density of 28.2 mA cm-2. Despite the ultrahigh photocurrent, the power conversion efficiencies are low due to low fill factor. Future work needs to improve fill factor while maintaining ultrahigh photocurrent via device engineering.
研究不足
The power conversion efficiencies of the integrated solar cells are still low due to low fill factor. The up-shifted LUMO level of F8IC near the perovskite layer prevents efficient electron transport, leading to low fill factor.
1：Experimental Design and Method Selection:
The study involved the fabrication of integrated perovskite/OBHJ solar cells with a conventional n–i–p planar architecture. The OBHJ layer was spin-coated onto the perovskite layer using orthogonal solvents to simplify the fabrication process.
2：Sample Selection and Data Sources:
The materials used include F8IC, PTB7-Th, PCBM, PbI2, and others, with specific concentrations and solvents for film preparation.
3：List of Experimental Equipment and Materials:
Equipment includes a solar simulator, UV-visible spectrophotometer, scanning electron microscope, and others. Materials include ITO glass, SnO2, CH3NH3I, CH3NH3Cl, MoO3, and Ag.
4：Experimental Procedures and Operational Workflow:
The fabrication process involved cleaning ITO glass, spin-coating SnO2 and perovskite layers, spin-coating the OBHJ layer, and evaporating MoO3 and Ag electrodes.
5：Data Analysis Methods:
The performance of the solar cells was evaluated using J-V curves, EQE spectra, and other measurements to analyze photocurrent, voltage, fill factor, and power conversion efficiency.
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B2912A Precision Source/Measure Unit
B2912A
Agilent Technologies
Measurement of J-V curves
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Hitachi S4800 scanning electron microscope
S4800
Hitachi
Cross-sectional SEM imaging
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Hitachi UH4150 UV-visible spectrophotometer
UH4150
Hitachi
UV-visible absorption spectra measurement
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FLS980
FLS980
Edinburgh Instruments Ltd
Steady-state PL and TRPL measurements
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ITO glass
sheet resistance = 15 Ω
Substrate for solar cell fabrication
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SnO2
Electron transport layer
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PbI2
99.9985%
Alfa Aesar
Perovskite precursor
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PTB7-Th
1-material Inc.
Organic donor material
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F8IC
Fused-ring electron acceptor
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PCBM
purity > 99.0%
American Dye Inc.
Fullerene acceptor
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MoO3
Hole transport layer
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Ag
Electrode material
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XES-70S1 solar simulator
XES-70S1
SAN-EI Electric Co., Ltd.
Light source for solar cell testing
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SRC–1000-TC-QZ monocrystalline silicon reference cell
SRC–1000-TC-QZ
VLSI Standards Inc.
Reference cell for light intensity calibration
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QE-R3011 Solar Cell Spectral Response Measurement System
QE-R3011
Enlitech Co., Ltd.
Measurement of EQE spectra
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