研究目的
To investigate the performance of carbon-based planar CsPbBr3 perovskite solar cells with room-temperature sputtered Nb2O5 electron transport layer compared to those with crystalline Nb2O5 and TiO2 electron transport layers.
研究成果
The a-Nb2O5-based CsPbBr3 PSC achieved a champion efficiency of 5.74%, outperforming those with c-Nb2O5 (5.12%) and c-TiO2 (4.67%) ETLs. The improved performance is attributed to the suitable work function, high optical transmittance, low charge recombination, and superior crystallinity of CsPbBr3 film on a-Nb2O5. The unencapsulated devices also exhibited excellent long-term stability, suggesting a promising direction for high-performance inorganic PSCs.
研究不足
The study focuses on inorganic CsPbBr3 PSCs and does not explore organic-inorganic hybrid PSCs. The performance comparison is limited to a-Nb2O5, c-Nb2O5, and c-TiO2 ETLs. The long-term stability test was conducted without encapsulation, which may not fully represent real-world application conditions.
1：Experimental Design and Method Selection:
The study involved the preparation of amorphous Nb2O5 (a-Nb2O5) ETL through a room-temperature sputtering method for inorganic planar CsPbBr3 PSC. Comparative studies were conducted with crystalline Nb2O5 (c-Nb2O5) and TiO2 (c-TiO2) ETLs prepared by high-temperature annealing.
2：Sample Selection and Data Sources:
FTO substrates were used as the base for depositing Nb2O5 and TiO2 layers. CsPbBr3 perovskite films were deposited on these substrates.
3：List of Experimental Equipment and Materials:
Equipment included RF magnetron sputtering for Nb2O5 deposition, spin coating for perovskite layer application, and vacuum evaporation for CuPc layer deposition. Materials included Nb2O5 target, PbBr2, CsBr, DMF, methanol, isopropanol, and conductive carbon paste.
4：Experimental Procedures and Operational Workflow:
The process involved cleaning FTO substrates, depositing Nb2O5 or TiO2 layers, spin-coating CsPbBr3 perovskite films, depositing CuPc layer, and applying carbon electrodes.
5：Data Analysis Methods:
Characterization techniques included XRD, SEM, AFM, XPS, PL, TRPL, UV-VIS spectrophotometry, Hall-effect measurement, IPCE, and J-V curve testing.
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