研究目的
Investigating the performance enhancement of wide-bandgap perovskite solar cells (PSCs) through the use of a 2D/3D perovskite heterostructure passivation and their application in four-terminal tandem solar cells with silicon and CIGS bottom cells.
研究成果
The study demonstrates that a 2D/3D perovskite heterostructure passivation is effective across a broad bandgap range, significantly enhancing the performance of wide-bandgap PSCs. This strategy enables the development of high-efficiency four-terminal tandem solar cells with silicon and CIGS bottom cells, achieving stabilized PCEs of up to 25.7% and 25.0%, respectively. The findings highlight the importance of surface passivation and the robustness of the four-terminal tandem configuration across a range of perovskite bandgaps.
研究不足
The study notes that the PCE for semitransparent PSCs with higher Br content (Eg > 1.74 eV) remains stable for only around 30 min before decreasing, possibly due to enhanced phase segregation. Additionally, the PCEs reported are still below feasible PCEs of perovskite-based tandems, indicating room for improvement in reducing optical and electrical losses.
1：Experimental Design and Method Selection:
The study employs a 2D/3D perovskite heterostructure passivation strategy for double-cation wide-bandgap PSCs with engineered bandgap. The methodology includes spin-coating n-butylammonium bromide (BABr) on top of the perovskite absorbers to form the heterostructure.
2：Sample Selection and Data Sources:
Semitransparent PSCs with engineered bandgap are fabricated and characterized. The study uses high-efficiency c-Si and CIGS bottom solar cells for tandem configurations.
3：List of Experimental Equipment and Materials:
Equipment includes a solar simulator for J-V measurements, SEM for imaging, XRD for crystal structure analysis, and UV-Vis spectrophotometry for optical characterization. Materials include ITO-coated glass, SnO2, perovskite precursors, spiro-MeOTAD, and Au or MoOx/ITO electrodes.
4：Experimental Procedures and Operational Workflow:
The fabrication process involves depositing layers sequentially, including the perovskite absorber, 2D/3D heterostructure, and electrodes. Characterization involves J-V measurements, EQE measurements, and stability tests.
5：Data Analysis Methods:
Data analysis includes comparing photovoltaic parameters of devices with and without the 2D/3D heterostructure, analyzing EQE and transmittance spectra, and calculating tandem PCEs.
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ITO-coated glass
Luminescence Technology
Substrate for solar cells
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SnO2 nanoparticles
Alfa Aesar
Electron transport layer
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Formamidinium iodide
Dyesol
Perovskite precursor
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CsI
Alfa Aesar
Perovskite precursor
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PbI2
Alfa Aesar
Perovskite precursor
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PbBr2
Alfa Aesar
Perovskite precursor
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N,N-dimethylformamide
Sigma Aldrich
Solvent
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Dimethylsulfoxide
Sigma Aldrich
Solvent
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Chlorobenzene
Sigma Aldrich
Solvent
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n-butylammonium bromide
Dyesol
2D passivation agent
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Spiro-OMeTAD
Luminescence Technology
Hole transport layer
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Lithium bis(trifluoromethanesulfonyl) imide
Sigma Aldrich
Additive for spiro-OMeTAD
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4-tert butylpyridine
Sigma Aldrich
Additive for spiro-OMeTAD
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Au
Electrode
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MoOx
Sigma Aldrich
Buffer layer
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MgF2
Anti-reflection coating
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