According to solvent-engineering, we design a ternary-mixed-solvent for the growth of high-quality cation-anion-mixed perovskite Cs(MAFA)Pb(IBr) film by introducing N-methyl-2-pyrrolidone（NMP） into the perovskite pr...
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According to solvent-engineering, we design a ternary-mixed-solvent for the growth of high-quality cation-anion-mixed perovskite Cs(MAFA)Pb(IBr) film by introducing N-methyl-2-pyrrolidone（NMP） into the perovskite precursor solvent. The addition of NMP triggers homogeneous nucleation and retards crystallization of perovskite due to the formation of Lewis acid-based adduct. More importantly, by adjusting the NMP/DMSO ratio, we can control the formation of intermediate phase, which affect the formation perovskite films. Based on the ternary-mixed-solvent method, a compacted,large grain, free-pin-hole and long charge carrier lifetime perovskite film is prepared, a perovskite solar cell with an impressive PCE approaching 20% is achieved.
In order to fabricate cost-effective solar cells, some prerequisites such as low-energy consumption, easily technological processes and high efficiency must be achieved. The methodology of low-temperature solution-pro...
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In order to fabricate cost-effective solar cells, some prerequisites such as low-energy consumption, easily technological processes and high efficiency must be achieved. The methodology of low-temperature solution-processed planar perovskite solar cells（PSCs） is desirable for achieving the aims. Although TiO is the most widely used material in preparing electron-transporting layers（ETLs） of PSCs, it usually needs high-temperature sintering process to enhance electron mobility, which is not only energy consumption but also unsuitable for polymer based flexible substrates. Here, we propose a novel strategy to solve the problem. We use the sophisticated solvothermal method with the aid of oleic acid（OA） ligands to synthesize high aspect ratio and well crystalline TiO nanorods. And then,the ligand-exchange treatment is applied to substitute the insulating OA ligands with BFions. These measures are very beneficial for low-temperature solution-processed high-quality TiO ETLs with highly electrical conductivity, fast electron extracting and transporting rates. Finally, the PSC with BF-capped TiO nanorod ETL achieves a high power conversion efficiency of 18.76% and good reproducibility. This work offers a feasible way to achieve high-efficiency low-temperature solution-processed planar PSCs.
The excellent electron transport layer can improve the performance of PSCs. In this paper, the niobium-doped tin oxide（Nb-Sn O2） nanosheets were synthesized by solvothermal method and used as ETL in PSCs. Characteri...
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The excellent electron transport layer can improve the performance of PSCs. In this paper, the niobium-doped tin oxide（Nb-Sn O2） nanosheets were synthesized by solvothermal method and used as ETL in PSCs. Characterization through TEM and SEM tests shows that the Nb-SnO nanosheets are uniformly distributed, which facilitates better contact between the perovskite layer and the electron transport layer and improves the electron mobility from the perovskite layer to the ETL interface. Due to the doping effect of Nb ions, the bandgap and highband energy levels are amplified, resulting in better energy levels aligned with the perovskite, and reduced electronic recombination. The experimental results show that the PSCs based on the Nb-SnO nanosheets ETL have better performance than the SnO-NRs ETL-based PSCs, the hysteresis is significantly reduced,and then the PCE of the PSCs is increased. Nb-SnO ETL-based PSCs achieved a photovoltaic conversion efficiency of 19.68%（19.13%） and a steady state efficiency of 19.38% when measured in reverse（forward） voltage scans.
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