Dr. Takashi Minemoto Profile

Dr. Takashi Minemoto

at Ritsumeikan Univ

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Publications (4)

Proceedings Article | 20 August 2020 Presentation

Pb free Sn- perovskite solar cells with over 13% efficiency

Kohei Nishimura, Muhammad Akmal Kamarudin, Daisuke Hirotani, Qing Shen, Takashi Minemoto, Kenji Yoshino, Shuzi Hayase

Proceedings Volume 11474, 114740X (2020) https://doi.org/10.1117/12.2566181

KEYWORDS: Solar cells, Perovskite, Lead, Tin, Germanium, Ions, Energy efficiency, Electron transport, Crystals

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Proceedings Article | 18 September 2018 Presentation

Pb free perovskite solar cells consisting of mixed metal SnGe perovskite as light absorber (Conference Presentation)

Shuzi Hayase, Nozomi Ito, Muhammad Akmal Kamarudin Kamarudin, Qing Shen, Yuhei Ogomi, Satoshi Iikubo, Kenji Yoshino, Takashi Minemoto, Taro Toyoda

Proceedings Volume 10737, 107371F (2018) https://doi.org/10.1117/12.2321061

KEYWORDS: Perovskite, Solar cells, Lead, Metals, Germanium, Tin, Doping, Solar energy, Chemical species, Photovoltaics

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Despite the high-efficiency of these lead-based perovskite solar cells, the problem associated from the toxic nature of lead has open a new research direction which focuses on lead-free perovskite materials. As an alternative, tin has been proposed to replace lead. The highest efficiency obtained with Sn only perovskite was 9 % which was based on 2D and 3D mixture of FASnI3. However, Sn-based perovskites are known to have low stability in air. The use of germanium-based perovskite in solar cell was first realized by Krishnamoorthy et. al. The measured solar cell performance was notably low, 0.11 % for CsGeI3 and 0.20 % for MAGeI3. A theoretical study exploring hybrid tin and germanium perovskite showed that it is possible to prepare a stable Sn-Ge perovskite material that absorbs the sunlight spectrum. In this study, a new type of SnGe mixed metal perovskite solar cells are reported with enhanced efficiency and stability. In this report, FA0.75MA0.25Sn1-xGexI3 (abbreviated as SnGe(x)-PVK) were used for the mixed metal SnGe perovskite. XRD spectra showed that the structure is perovskite. The structure of Ge-doped Sn perovskite was also discussed from the view point of band gap, conduction and valence band level, XPS analysis, and the urbach energy. It can be concluded that most of the Ge atoms passivate the surface of the Sn perovskite (graded structure).For SnGe(0)-PVK device, the averageJsc was 17.61 mA/cm2, VOC was 0.46 V, FF was 0.41 and PCE of 3.31 %. Upon doping with 5 wt% of Ge, the JSC increased up to 19.80 mA/cm2, FF improved up to 0.55 with an overall efficiency of 4.48 %. Upon increasing the Ge content more than 10wt%, all the photovoltaic parameters decreased significantly which resulted in an efficiency as low as 0.80 % for SnGe(0.2)-PVK device. After optimization, 7.75% of SnGe(5)-PVK device is reported. Significant effect on Ge doping was seen in the enhancement of the stability. The stability in air has been improved significantly with the Ge doping, retaining 80 % of its original performance, remarkable stability enhancement, compared with 10 % retention for non-doped sample. This work provides a platform for further research on lead-free Sn-Ge based perovskite solar cells.

Proceedings Article | 19 September 2017 Presentation

Enhancement of efficiency for mixed metal Sn/Pb perovskite solar cells from the view point of hetero-interface traps (Conference Presentation)

Yuhei Ogomi, Daiki Yamasuso, Ayumu Yonaha, Kengo Hamada, Erina Yamaguchi, Qing Shen, Taro Toyoda, Kenji Yoshino, Takashi Minemoto, Shuzi Hayase

Proceedings Volume 10363, 1036313 (2017) https://doi.org/10.1117/12.2274760

KEYWORDS: Interfaces, Solar cells, Metals, Light harvesting, Photovoltaics, Tin, Lead, Infrared radiation, Absorption, Computer architecture

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Proceedings Article | 11 September 2007 Paper

Fabrication of Cu(In,Al)Se2 solar cells by three-stage evaporation process

Takao Hayashi, Takashi Minemoto, Tsutomu Araki, Hideyuki Takakura

Proceedings Volume 6651, 66510L (2007) https://doi.org/10.1117/12.731718

KEYWORDS: Solar cells, Aluminum, Copper indium gallium selenide, Copper indium disulfide, Selenium, Scanning electron microscopy, Molybdenum, Copper, External quantum efficiency, Thin films

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