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Comparison of effects of ZnO and TiO2 compact layer on performance of perovskite solar cells
摘要： In this work, organic?inorganic perovskite solar cells using compact layers of TiO2 and ZnO have been constructed. The ZnO compact layer was synthesized through the chemical hydrolysis process. The TiO2 compact layer was formed by spin-coating C16H28O6Ti in n-butanol. AFM and light absorption studies showed that the surface roughness and optical property of TiO2 and ZnO are nearly identical. However, according to the energy level diagram, the conduction band edge of ZnO is lower than that of TiO2, which is beneficial for electron transfer from the light absorption material to the FTO substrate and thus reducing electron-hole recombination. As a result, employing ZnO in the cell improved both the photocurrent and photovoltaic performance in comparison to TiO2. The best conversion efficiency obtained from the device using ZnO as the compact layer is 17.1%, which is attributed to facilitated photo-generated electron transport in the perovskite solar cell.
关键词： Electronic Transmission,Energy Level.,Compact Layer
更新于2025-09-23 15:19:57
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Investigating the Role of Reduced Graphene Oxide as a Universal Additive in Planar Perovskite Solar Cells
摘要： In this work we present the effects of the incorporation of reduced graphene oxide (rGO) nanoflakes into the titania compact layer, the methylammonium lead iodide (CH3NH3PbI3) absorber and the Spiro-MeOTAD hole transporter which are typical components of a planar perovskite solar cell (PSC). The addition of rGO within the TiO2 electron transport layer (ETL) offers fast electron transport rates toward the anode and favors the growth of large, uniform perovskite crystals. When added in MAPbI3, rGO further increases the perovskite grains size and creates a more homogenous and smooth film with enhanced crystallinity, thus improving the power conversion efficiency (PCE) of the corresponding PSC. On the contrary, its presence in Spiro-MeOTAD is detrimental for the cells performance. For the first time in the literature a graphene derivative favors the performance of a MAPbI3–based PSC when incorporated as an additive in both the ETL and the perovskite absorber. As a result, we obtained devices with optimized electrical characteristics, resulting to stabilized 13.6% PCE, outperforming by 20% the reference (rGO-free) ones. Moreover, the presence of rGO offered additional stability to the solar cells which retained 40% of their initial PCE after 50 days of storage in mildly humid, dark environment.
关键词： Reduced graphene oxide,Lead acetate,Planar perovskite solar cells,MAPbI3 absorber,Titania compact layer
更新于2025-09-16 10:30:52
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Preparation of TiO2 compact layer by heat treatment of electrospun TiO2 composite for dye-sensitized solar cells
摘要： The power conversion efficiency (PCE) of the dye-sensitized solar cell was improved by using titanium dioxide (TiO2) compact layer prepared via heat treatment assisted electrospinning. Titanium tetraisopropoxide mixed with polyvinyl-alcohol was used as the electrospun solution. In this study, TiO2 photoanode with TiO2 compact layer was compared with TiO2 photoanode without TiO2 compact layer where the PCE was improved by 76.88%. Electrochemical impedance spectroscopy proved that the TiO2 compact layer can reduce the series resistance and improved the short circuit current density, resulting in a low recombination effect that leads to a higher PCE. The electron lifetime and charge collection efficiency of TiO2 nanoparticles with TiO2 compact layer displayed a higher value compared to TiO2 nanoparticles without TiO2 compact layer.
关键词： titanium isopropoxide,polyvinyl alcohol,dye-sensitized solar cell,compact layer,electrospinning
更新于2025-09-11 14:15:04
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Highly efficient perovskite solar cells based on a Zn2SnO4 compact layer
摘要： In the present work, a new reflux condensation route has been developed for synthesizing Zn2SnO4 film, which was first used as a compact layer in a perovskite solar cell (PSC), and achieved an efficiency of 20.1%. The high efficiency of PSC could be contributed to the following: i) As a compact layer in a PSC, Zn2SnO4 exhibits high electron mobility and has an appropriate energy band structure, resulting in the efficient extraction of carriers and transport of electrons; ii) the surface of the FTO substrate is completely covered by a Zn2SnO4 compact layer, and the direct contact between a perovskite layer and FTO is prevented, leading to significantly efficiently suppression of charge recombination. Consequently, the cell consisting of a Zn2SnO4 compact layer exhibits excellent photovoltaic performance.
关键词： Zn2SnO4,photovoltaic property,compact layer,perovskite solar cells,charge recombination,energy band structure
更新于2025-09-11 14:15:04