Details

Autor(en) / Beteiligte

• Khan, Javid
• Ur Rahman, Naveed
• Khan, Wasim Ullah
• Hayat, Asif
• Yang, Zhiyong
• Ahmed, Gulzar
• Akhtar, Muhammad Nadeem
• Tong, Shengfu
• Chi, Zhenguo
• Wu, Mingmei

Titel

Multi-dimensional anatase TiO2 materials: Synthesis and their application as efficient charge transporter in perovskite solar cells

Ist Teil von

• Solar energy, 2019-05, Vol.184, p.323-330

Ort / Verlag

New York: Elsevier Ltd

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A novel perovskite solar cell was designed based on 3D hierarchical TiO2 spheres as efficient charge extraction thin film, with a high photo-conversion efficiency due to enhance light scattering, light harvesting, better penetration of the perovskite in the porous HTSs network and facilitated charge extraction and electron transport. [Display omitted] •Three morphologically different TiO2 substrates were synthesized hydrothermally.•They were applied as ETLs in PSCs, with and without a TiO2 compact layer.•Fast charge transport, enhanced light absorption and less charge recombination.•The PSCs based on hierarchical TiO2 spheres, yielded an efficiency of 15.08%. Recently, organo-metal halide perovskite (e.g., CH3NH3PbI3) solar cells have shown a significant surge in progress and efficiency. The photovoltaic performance of perovskite solar cells (PSC) extensively depends on the morphology of the materials at nano-level, because the intrinsic electrical, optical and electrochemical properties also change with a change in morphology. Different TiO2 nanostructures with diverse dimensionalities, 0D hollow TiO2 nanoparticles (HTNPs), 3D hollow TiO2 mesospheres (HTMSs) and 3D hierarchical TiO2 spheres (HTSs) were synthesized hydrothermally. The PSCs based on 3D HTSs or 3D HTMSs as electron transport layers (ETLs) shows better performance than the PSCs fabricated with 0D HTNPs as ETL. The enhanced results can be attributed to the better penetration of the perovskite materials in the porous network of the HTSs or HTMSs and decreased interfacial recombination due to superior charge extraction and electron transport at the HTSs/CH3NH3PbI or HTMSs/CH3NH3Pb interfaces. By using a self-assembled TiO2 compact layer (c-TiO2), followed by a mesoporous layer of HTSs, produces PSCs with an excellent efficiency of 15.08%. Such c-TiO2-ETL films may improve PSCs performance by enhancing electron extraction and block the photogenerated holes.