研究目的
To investigate the role of individual cation and halide components on the intrinsic long-term stability of perovskite solar cells (PSCs) and to pursue devices with high efficiency and superior long-term stability simultaneously.
研究成果
The incorporation of a small amount of MA into the FAPbI3-based PSCs is harmful to the long-term stability due to defect-induced degradation, while Br incorporation is beneficial to enhance the stability of FAPbI3-based PSCs via suppressing the trap density in the perovskite films. This work emphasizes the importance of compositional engineering and defects management for improving the long-term stability of PSCs.
研究不足
The study focuses on the intrinsic stability of PSCs under controlled conditions (without moisture and oxygen), which may not fully represent the stability under real-world operating conditions. Additionally, the effect of higher dopant content on the stability of PSCs was not extensively explored.
1：Experimental Design and Method Selection:
A low dopant content (1%) doping strategy was employed to reveal the role of individual bromide and methylammoniun (MA) on the intrinsic operational stability of formamidinium lead iodide (FAPbI3-based) PSCs.
2：Sample Selection and Data Sources:
Cs-doped FAPbI3 (Cs
3：05FA95PbI3) was used as the pristine sample. Incorporating 1% of CsPbBr3 into the pristine CsFA formed Br-doped perovskite, and incorporating 1% of MAPbBr3 into the pristine CsFA formed Br- and MA-doped perovskite. List of Experimental Equipment and Materials:
Perovskite films were prepared by spin-coating the corresponding precursor solution onto the substrate of FTO/c-TiO2/m-TiO2 via the typical one-step method.
4：Experimental Procedures and Operational Workflow:
The surface morphology, bandgaps, photoluminescence spectra, and X-ray diffraction (XRD) of the perovskite films were examined. Space-charge-limited current (SCLC) measurements were performed to estimate the trap density in the as-prepared perovskite films.
5：Data Analysis Methods:
The trap state density was calculated using the trap-filled limit voltage VTFL. The performance and intrinsic long-term operational stability of PSCs were investigated by monitoring the evolution of their device performance with the operation time under maximum power point (MPP) tracking.
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