09:30 〜 11:30
▲ [18a-PB01-17] A Study of Modified Metal Halide Template and Dipping Temperature Control for Improvement of the Two-step Method
キーワード：perovskite solar cell, two-step method, metal halide template
Last few years, organometal halide perovskite solar cells (PSCs) have attracted huge attention based on their remarkable achievements in the photovoltaic field. Recently, they have achieved a power conversion efficiency (PCE) of 25.7%. The two-step method is one of the fabrication techniques of the PSCs and has been improved consistently. In the two-step method, porous metal halide templates are certainly favorable because of the efficient intercalation of the organic part however the porosity of the templates also induces defects in the organometal halide perovskite. To minimize the negative effects caused by the porosity of the metal halide templates, we introduce a new two-step method adopting a dense metal halide template and enhancing the intercalation of the organic part into the dense metal halide by controlling dipping solution temperature.
In this research, CH3NH3PbI3 (MAPbI3) PSCs (FTO glass/compact & mesoporous TiO2/MAPbI3/ Spiro-OMeTAD/Ag) were fabricated with the new two-step method. The dense metal halide templates (PbI2) were obtained via anti-solvent drop (AS-dr) method newly introduced and the dipping solution temperature of the organic part (MAI) was controlled at room temp. (RT), 30℃, 50℃, 70℃.
As is expected, the dense PbI2 templates deposited by the AS-dr method were not properly converted to MAPbI3, different from the PbI2 templates formed by the conventional method. The conversion problem was solved by increasing the dipping solution temperature and, consequently, we achieved a PCE of 17.14% with the AS-dr method and 70℃ dipping solution temperature, the highest result in this research.
In this research, CH3NH3PbI3 (MAPbI3) PSCs (FTO glass/compact & mesoporous TiO2/MAPbI3/ Spiro-OMeTAD/Ag) were fabricated with the new two-step method. The dense metal halide templates (PbI2) were obtained via anti-solvent drop (AS-dr) method newly introduced and the dipping solution temperature of the organic part (MAI) was controlled at room temp. (RT), 30℃, 50℃, 70℃.
As is expected, the dense PbI2 templates deposited by the AS-dr method were not properly converted to MAPbI3, different from the PbI2 templates formed by the conventional method. The conversion problem was solved by increasing the dipping solution temperature and, consequently, we achieved a PCE of 17.14% with the AS-dr method and 70℃ dipping solution temperature, the highest result in this research.