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A facile route of preparing nickel(II) oxide thin films for high-performance inverted perovskite solar cells
摘要： Perovskite solar cells (PSCs) have been very popular in the field of photovoltaics. In the inverted PSC structure, the hole transport layer deposited before perovskite photoactive layer plays a crucial role in power conversion efficiencies (PCE) and ambient stability of device. Here, we developed a facile method of preparing NiO hole transport layers aided by polymethyl methacrylate (PMMA) for inverted perovskite solar cells. Compared with reported fabrication methods, this route has the advantages of simple, low temperature, and low-cost processing. The corresponding devices exhibited a champion power conversion efficiency (PCE) of 17.78% and good stability. Various characterizations, XRD, Raman, AFM, SEM, PL etc were carried out to confirm the superior effect of the NiO film prepared by new method. We believe that this facile route will be a significant contribution for preparing high performance inverted perovskite solar cells.
关键词： NiO hole transport layers,Perovskite solar cells,low-temperature processing,PMMA,power conversion efficiency
更新于2025-09-23 15:19:57
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Enhancing the charge extraction and stability of perovskite solar cells using strontium titanate (SrTiO3) electron transport layer
摘要： Charge transport layers strongly influence the performance of perovskite solar cells (PSCs). To date, compact layers and mesoporous scaffolds of titanium dioxide have emerged as good electron transport layers (ETL), enabling record power conversion efficiencies (PCE). However, these ETLs require sintering above 400 °C, which excludes them from low-temperature applications such as flexible devices and silicon-heterojunction tandems. Furthermore, instability of TiO2 under prolonged exposure to sun light appears to be a critical issue. Here, we present the promising characteristics of low-temperature processed strontium titanate (STO) as an ETL to realize PSCs with 19% PCE. STO is a wide bandgap transparent inorganic perovskite. Compared to other low-temperature processed interlayers, STO reduces the parasitic absorption in the ultraviolet and visible range, improves the electron transport and greatly increases the stability of the devices, retaining ~80% of their initial efficiency after 1000 hours of constant white light illumination.
关键词： perovskite solar cells,stability,low-temperature processing,strontium titanate,electron transport layer
更新于2025-09-12 10:27:22
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A low temperature approach for photo/cathodoluminescent Gd <sub/>2</sub> O <sub/>2</sub> S:Tb (GOS:Tb) nanophosphors
摘要： Titrating the aqueous solution of equimolar RE(NO3)3 and (NH4)2SO4 with NH4OH to pH~9 at ~4 °C produced an amorphous precursor that yielded phase-pure and well dispersed RE2O2S nanopowder (RE=Gd0.99Tb0.01; GOS:Tb) via a RE2O2SO4 intermediate upon annealing in H2. The powders calcined at the typical temperatures of 700/1200 °C exhibited unimodal size distributions and have the average crystallize sizes of ~17/55 nm, average particle sizes of ~284/420 nm, and specific surface areas of ~14.62/4.53 m2/g (equivalent particle sizes: ~56/180 nm). The 1200 °C product exhibited sharp green luminescence at ~544 nm (FWHM = 2.3 nm; λex = 275 nm), with an absolute quantum yield of ~24.8% and a fluorescence lifetime of ~1.34 ms at room temperature. It was also shown that the powder possesses favorable thermal stability (the activation energy for thermal quenching of luminescence ~0.305 eV) and is stable under electron beam irradiation up to 7 kV and 50 μA. The synthetic technique has the advantages of scalability and favorable dispersion and high chemical/phase purity for GOS powder, which may allow the sintering of scintillation ceramics at lower temperatures.
关键词： low-temperature processing,oxysulfide,GOS,luminescence,nanopowder
更新于2025-09-04 15:30:14