研究目的
Investigating the two-stage ultraviolet degradation process of perovskite solar cells induced by the oxygen vacancy-Ti4+ states and proposing a method to enhance their UV stability.
研究成果
A two-stage UV degradation process of TiO2-based PSCs was discovered, driven by the transformation of Ti3+-VO states to Ti4+-VO states. Blocking this transformation with a PEIE-modified layer significantly enhanced the UV stability of the PSCs, offering a promising path to achieve high-efficiency devices with excellent UV resistance for commercialization.
研究不足
The ultrathin polymer interfacial layer (PEIE) may not be uniform and compact, which limits its UV resistance and the repeatability of device performance. The deposition process of the PEIE layer should be further optimized.
1：Experimental Design and Method Selection:
The study involved the preparation of planar perovskite solar cells with a structure of glass/FTO/c-TiO2/perovskite/spiro-OMeTAD/Au. The degradation under UV irradiation was monitored in an inert atmosphere.
2：Sample Selection and Data Sources:
Samples were prepared using a one-step solution method, and their performance was monitored under continuous UV irradiation.
3：List of Experimental Equipment and Materials:
Philip UV lamp (λ = 254 nm), SEM, XRD, XPS, UPS, PL, EIS, UV-vis spectrophotometer.
4：Experimental Procedures and Operational Workflow:
PSCs were irradiated with UV light, and their performance was monitored over time. The transformation of Ti3+-VO to Ti4+-VO states was studied, and the effect of a PEIE-modified layer was investigated.
5：Data Analysis Methods:
The data were analyzed using various spectroscopic and electrical characterization techniques to understand the degradation mechanism and the effect of the PEIE layer.
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SEM
FEI SIRION 200
FEI
Used for characterizing the morphologies of the as-prepared MA0.75FA0.25PbI3.
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XRD
Bruker D8 Advance
Bruker
Used for analyzing the chemical compositions and structures of the MA0.75FA0.25PbI3 films.
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XPS
Thermo Fisher Scientific ESCALAB 250Xi
Thermo Fisher Scientific
Used for collecting XPS spectra under 10-9 Torr vacuum using a monochromic Al-Ka X-ray source.
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UPS
ESCSLAB 250Xi
Thermo Fisher Scientific
Used for measuring UPS spectra to estimate the Fermi level of TiO2 films.
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PL spectrometer
Edinburg PLS 980
Edinburg
Used for measuring steady PL spectra of the perovskite films on FTO substrates at 80 K.
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UV-VIS spectrophotometer
UV-2600
Shimadzu
Used for measuring the absorption spectrums of the samples.
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Philip UV lamp
λ = 254 nm
Philip
Used for UV irradiation of perovskite solar cells to study their degradation under UV light.
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EQE measurement system
QE-R systems
Enli Tech
Used for measuring the external quantum efficiency of the PSCs.
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EIS workstation
Zahner Zennium
Zahner
Used for measuring the electrochemical impedance spectrum of the PSCs.
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