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Solvent engineering of SnO2 ETL for enhanced performance of carbon-based CsPbIBr2 PSCs
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Solvent engineering of SnO2 ETL for enhanced performance of carbon-based CsPbIBr2 PSCs
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Journal Article
Solvent engineering of SnO2 ETL for enhanced performance of carbon-based CsPbIBr2 PSCs
2025
Overview
This study thoroughly investigates the effects of different solvent engineering strategies on the structure and properties of SnO
2
electron transport layers (ETLs) and evaluates their performance-enhancing effects on carbon-based all-inorganic CsPbIBr
2
perovskite solar cells (PSCs). By comparing the SnO
2
ETLs prepared with ethanol (ET-SnO
2
) and isopropanol (IPA-SnO
2
) solvents and constructing corresponding CsPbIBr
2
PSCs devices, we comprehensively analysed the structure, morphology, wettability, light transmittance and electronic transport properties of the SnO
2
ETLs using characterization methods such as XRD, SEM, contact angle measurement, transmission spectroscopy, steady-state fluorescence spectroscopy and electrochemical impedance spectroscopy. Combined with the J-V characteristics of the device, we revealed the mechanism of the effect of solvent engineering on the performance of PSCs. The results showed that IPA-SnO
2
exhibited better performance with lower contact angle and higher compactness, which is conducive to electron transport and reduces interfacial defects. IPA-SnO
2
also promoted the growth of CsPbIBr
2
crystals, forming larger and denser crystal structures and reducing pinhole defects. In addition, IPA-SnO
2
improves the light transmittance of the FTO substrate and the light absorption of the CsPbIBr
2
film, thereby increasing the light trapping efficiency. Finally, the IPA-SnO
2
-based PSCs achieved a PCE of 5.95%, an improvement of 25% compared to ET-SnO
2
, demonstrating good application prospects. This study provides an important experimental basis for optimizing the preparation process of SnO
2
ETL and improving the performance of carbon-based CsPbIBr
2
PSCs.
Graphical Abstract
Highlights
Investigation of the effects of different solvent engineering strategies (ethanol and isopropanol) on the structure and properties of SnO
2
ETLs.
Fabrication and characterization of carbon-based CsPbIBr
2
PSCs with SnO
2
ETLs prepared using different solvents.
Analysis of the effect of solvent engineering on the performance of PSCs, including device structure, energy level arrangement and material properties.
Publisher
Springer US,Springer Nature B.V
