研究目的
To elucidate the reason behind the low efficiency of normal structure SnPb perovskite solar cells (PSCs) and to overcome the problem through surface passivation.
研究成果
The introduction of a fullerene monolayer on the TiO2 surface successfully avoided the formation of Ti-O-Sn bonds, leading to an efficiency increase from 5.14% to 7.91% in normal structure SnPb PSCs. This provides a direction for improving the device performance of such solar cells through heterojunction engineering.
研究不足
The study focuses on the interface between TiO2 and SnPb perovskite layers, and the efficiency improvement is limited to the specific passivation method used.
1：Experimental Design and Method Selection:
The study involved passivating the TiO2 surface with carboxylic acid C60 to avoid direct contact between titania and SnPb perovskite layer, aiming to reduce carrier traps.
2：Sample Selection and Data Sources:
SnPb mixed metal perovskites were used as light absorption materials.
3：List of Experimental Equipment and Materials:
Materials included Titanium diisopropoxide bis(acetylacetonate), TiO2 paste, Lead (II) iodide, Tin (II) iodide, Methylammonium iodide, and others. Equipment included Quartz Crystal Microbalance (QCM) measurement, X-ray Photoelectron Spectroscopy (XPS) analysis, and Photoluminescence-spectroscopy.
4：Experimental Procedures and Operational Workflow:
The porous TiO2 substrates were dipped in the passivation solution, spin-coated, and annealed. Perovskite films were prepared and annealed in two steps.
5：Data Analysis Methods:
The adsorption of fullerene on TiO2 was measured using QCM. XPS analysis, PL decay curves, and photovoltaic performance were analyzed.
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Titanium diisopropoxide bis(acetylacetonate)
Sigma Aldrich
Used in the preparation of compact TiO2 layers.
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TiO2 paste
PST-30NRD
JGC Catalysts and Chemicals Ltd.
Used in the preparation of mesoporous TiO2 layers.
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Lead (II) iodide
TCI
Used in the preparation of perovskite solution.
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Tin (II) iodide
Sigma Aldrich
Used in the preparation of perovskite solution.
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Methylammonium iodide
TCI
Used in the preparation of perovskite solution.
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Quartz Crystal Microbalance
Meywafosus Co. LTD
Used to measure the adsorption of fullerene on TiO2.
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X-ray Photoelectron Spectroscopy
Used for surface analysis.
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