Impact of compact TiO2 interface modification on the crystallinity of perovskite solar cells

Abstract

The effect of TiO2 interfacial morphology on perovskite crystallinity was investigated by modifying the micro and nanoscale surface roughness of compact TiO2. While surface treatments of the compact TiO2 layer are recognized as effective strategies to enhance the photovoltaic performance of perovskite solar cells, the discussion regarding the crystallinity of perovskite atop TiO2 has been limited. In this study, we explored the impact of micro and nano scale interface morphology on perovskite crystal formation and its subsequent effects on device performance. Surprisingly, despite the absence of noticeable voids at the interface between the compact TiO2 and perovskite layers, the perovskite crystal morphology exhibited significant improvement following either micro or nanoscale interfacial modification. This enhancement ultimately led to improved photoconversion efficiency and reduced I–V hysteresis. These results emphasize the importance of underlayer surface morphology in the perovskite crystallization and suggest that the presence of grain boundaries within the perovskite layer may also contribute to I–V hysteresis in perovskite solar cells.

Empirical and Theoretical Relations between the Nano Size and Some Optical and Electrical Properties of Perovskite Cells

“…The change of halide doping (Cl, Br, I) Changes the band gap which becomes lower for I. George G.Njema [18] also obtained the same foundations, since it indicated that increasing crystallization degree increases efficiency which is related to the absorption coefficient and conductivity. The same results were found by Saemi Takahashi [19] where improving degree of crystallization increases the efficiency. Similarly, Ningya Ren [20] showed that increase of crystal orientation increases the efficiency.…”

“…The research done by Saemi Takahashi [19] studied the effects of TiO2 interfacial morphology on perovskite solar cells by modifying micro and Nano surface roughness on the crystallinity of the perovskite layer. He found significant improvement of the crystal morphology.…”

Interface- and Temperature-Sensitive Linear Electric Field Effects on Exciton Absorption of CH3NH3PbI3 Perovskite Films

“…Further, the electronic structure of the MAPbI 3 film has been reported to depend on the substrate on which the MAPbI 3 film is coated, including the possibility of a chemical reaction at the interface. , The present results of EA­(1 f ) spectra imply that the morphology of MAPbI 3 at the interface significantly depends on the contacted substrate and on temperature, even when the morphology of the bulk crystal is independent of the substrate on which the MAPbI 3 film is coated. In a recent paper, the importance of interlayer morphology in perovskite crystallization has been emphasized in relation to photovoltaic performance and I–V hysteresis in perovskite solar cells.…”

The Effect of Changing the Nano Size and Crystal Spacing on the Energy Gap and Other Optical and Electrical Properties of Ba_xFe_(1-x)TiO₄ Perovskite Cells and Their Theoretical Relations

“…But the velocity is related to the frequency the atomic radius and the crystal size according to the relationship. ωa = v 0 (22) Hence one gets the absorption coefficient and the transmission coefficient T to be. ∝ = 2k 2 =1/T (23) where the absorption coefficient takes the form…”

“…The energy bandwidth is dependent on the halide type (Cl, Br, I) and its concentration. work done by Masha Moradbeigi [22] aims to make perovskite cells commercially available. This is done by using simulation.…”