Improving the Efficiency of Perovskite Solar Cell through the Addition of Compact Layer under TiO₂ Electron Transfer Material

Abstract:

In the fabrication of perovskite solar cells, the perovskite layer is typically deposited onto the TiO₂ semiconductor layer. The TiO₂ layer serves as an electron transport material (ETM). In order to form the perovskite layer firmly and evenly, a structured mesoporous (MS) TiO₂ surface is required. A porous layer could also make the electrons move more quickly through the pores to reach the contact. However, the electron-hole recombination and electron trapping in the dead end pore are still occurred. One of the solutions to overcome this problem is to add a thin compact layer (CL)-TiO₂ under MS-TiO₂ layer. The CL-TiO₂ is expected as to prevent recombination and attract electrons trapped in the MS-TiO₂ layer. In this paper, we report the addition of a thin compact layer (CL)-TiO₂ under MS-TiO₂ layer in the fabrication of perovskite solar cells based on methyl ammonium lead iodide (CH₃NH₃PbI₃). The compact layer TiO₂ was grown under mesoporous TiO₂ layer by dip-coating in TiCl₄ solution. The time of the dip coating was varied to obtain an optimum efficiency improvement. The structure of the device is glass/FTO/CL-TiO₂/MS-TiO₂/ CH₃NH₃PbI₃/Spiro-OMeTAD/Ag/FTO/glass. It was concluded that the addition of CL-TiO₂ can improve the perovskite solar cells power conversion efficiencies. The best efficiency was obtained from the 15 minutes dip-coating, which corresponded to the thinnest CL-TiO₂ out of all samples. The electrical characterization performed under irradiation with an intensity of 50 mW/cm² at 25 °C generated an open circuit voltage of 0.28 V, a short circuit current density of 0.25 mA/cm² and a power conversion efficiency of 0.60 %.

• Periodical: Materials Science Forum (Volume 929)
• Pages: 218-224
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.929.218
• Online since: August 2018
• Authors: Erlyta Septa Rosa*, Natalita Maulani Nursam, Shobih Shobih, Rizky Abdillah
• Keywords: CH₃NH₃PbI₃, Compact Layer, Mesoporous, Perovskite, Solar Cells, TiO₂

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