Investigating the Morphology, Optical, and Thermal Properties of Multiphase-TiO2/MAPbI3 Heterogeneous Thin-Films for Solar Cell Applications

Condensed Matter

Tshwafo E. Motaung¹  Motlalepula R. Mhlongo²  Setumo V. Motloung²  Teboho P. Mokoena²  Thembinkosi D. Malevu²  Lehlohonolo F. Koao³ 

[1] Department of Chemistry, Sefako Makgatho Health Sciences University, P.O. Box 235, Medunsa 0204, South Africa;Department of Physics, Sefako Makgatho Health Sciences University, P.O. Box 94, Medunsa 0204, South Africa;Department of Physics, University of the Free State (Qwa Qwa Campus), Private Bag X13, Phuthaditjhaba 9866, South Africa;

关键词: multiphase TiO₂;    mesoporous TiO₂;    perovskite solar cells;    doctor blade;    conductive silver ink;   

DOI  :  10.3390/condmat7020039

来源: DOAJ

【 摘 要 】

The present study evaluates the effect of mesoporous multiphase titanium dioxide (TiO₂) nanoparticles (NPs) as an electron transporting layer and investigates the influence of phase composition on the perovskite solar cell (PSC) performances. This study also aims to evaluate PSC performance using conductive silver ink as an alternative counter electrode. The heterogeneous PSC thin-film solar cells were successfully fabricated and assembled by using a simple a doctor blade and two-step spin coating methods under ambient conditions. Scanning electron microscopy (SEM) micrograph images investigate methyl ammonium lead iodide (MAPbI₃) crystal formation on the mesoporous TiO₂ surface structure. Energy-dispersive x-ray spectroscopy (EDX) spectra reveal excellent qualitative and quantitative analysis corresponding to the SEM images in the TiO₂/MAPbI₃ heterogeneous thin films. Thermogravimetric analysis (TGA) characterization reveals that the TiO₂/MAPbI₃ thin films are thermally stable recording a maximum of 15.7% mass loss at 800 °C elevated temperatures. Photoluminescence spectroscopy (PL) characterized the effect of multiphase TiO₂ phase transformation on the TiO₂/MAPbI₃ recombination efficiencies. A maximum of 6% power conversion efficiency (PCE) with the open-circuit voltage (Voc) of 0.58 ± 0.02 V and short circuit current (Jsc) of 3.89 ± 0.17 mAcm⁻² was achieved for devices with an active area of 3 × 10⁻⁴ m² demonstrating that the synthesized multiphase TiO₂ nanoparticles are promising for large surface area manufacturing. Therefore, it is apparent that multiphase TiO₂ NPs play a significant role in the performance of the final device.

【 授权许可】

Unknown